Merge code from icode: 1) KVDB

Change-Id: I770515d6a29c4572a070165b9a22d87ff212b057

.gitignore

+build
+.baidu*
+.bcloud*
+output

CMakeLists.txt

@@ -26,6 +26,7 @@ message(STATUS "CXX compiler: ${CMAKE_CXX_COMPILER}, version: "
 message(STATUS "C compiler: ${CMAKE_C_COMPILER}, version: "
         "${CMAKE_C_COMPILER_ID} ${CMAKE_C_COMPILER_VERSION}")
 
+    
 find_package(Git REQUIRED)
 find_package(Threads REQUIRED)
 find_package(CUDA QUIET)
@@ -46,7 +47,7 @@ set(THIRD_PARTY_BUILD_TYPE Release)
 
 option(WITH_AVX     "Compile Paddle Serving with AVX intrinsics"    ${AVX_FOUND})
 option(WITH_MKL     "Compile Paddle Serving with MKL support."      ${AVX_FOUND})
-option(WITH_GPU     "Compile Paddle Serving with NVIDIA GPU"        ${CUDA_FOUND})
+#option(WITH_GPU     "Compile Paddle Serving with NVIDIA GPU"        ${CUDA_FOUND})
 option(CLIENT_ONLY  "Compile client libraries and demos only"       FALSE)
 
 set(WITH_MKLML ${WITH_MKL})
@@ -60,6 +61,7 @@ if (NOT DEFINED WITH_MKLDNN)
 endif()
 
 include(external/leveldb)
+include(external/rocksdb)
 include(external/zlib)
 include(external/boost)
 include(external/protobuf)
@@ -67,6 +69,8 @@ include(external/brpc)
 include(external/gflags)
 include(external/glog)
 include(external/snappy)
+include(external/gtest)
+#include(external/redis++)
 include(generic)
 include(flags)
 
@@ -81,6 +85,8 @@ include_directories(${PADDLE_SERVING_BINARY_DIR})
 
 set(EXTERNAL_LIBS
     gflags
+    rocksdb
+    #  redis++
     glog
     protobuf
     paddlepaddle
@@ -105,6 +111,7 @@ add_subdirectory(configure)
 add_subdirectory(pdcodegen)
 add_subdirectory(sdk-cpp)
 add_subdirectory(demo-client)
+add_subdirectory(kvdb)
 
 if (NOT CLIENT_ONLY)
 add_subdirectory(predictor)

cmake/external/gtest.cmake

@@ -12,72 +12,33 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-#FIXME:(gongwb) Move brpc's gtest dependency.
-IF(WITH_TESTING OR (WITH_DISTRIBUTE AND NOT WITH_GRPC))
-    IF(WITH_TESTING)
-        ENABLE_TESTING()
-    ENDIF(WITH_TESTING)
+INCLUDE(ExternalProject)
+
+SET(GTEST_SOURCES_DIR ${THIRD_PARTY_PATH}/gtest)
+SET(GTEST_INSTALL_DIR ${THIRD_PARTY_PATH}/install/gtest)
+SET(GTEST_INCLUDE_DIR "${GTEST_INSTALL_DIR}/include" CACHE PATH "gtest include directory." FORCE)
+SET(GTEST_LIBRARIES "${GTEST_INSTALL_DIR}/lib/libgtest.a" CACHE FILEPATH "gtest library." FORCE)
+INCLUDE_DIRECTORIES(${GTEST_INCLUDE_DIR})
+
+ExternalProject_Add(
+    extern_gtest
+    ${EXTERNAL_PROJECT_LOG_ARGS}
+    PREFIX ${GTEST_SOURCES_DIR}
+    GIT_REPOSITORY "https://github.com/google/googletest"
+    GIT_TAG master
+    UPDATE_COMMAND ""
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND CXXFLAGS=-fPIC && mkdir build && cd build && cmake .. && make -j ${NUM_OF_PROCESSOR} gtest
+    INSTALL_COMMAND mkdir -p ${GTEST_INSTALL_DIR}/lib/ 
+    && cp ${GTEST_SOURCES_DIR}/src/extern_gtest/build/lib/libgtest.a ${GTEST_LIBRARIES}
+    && cp -r ${GTEST_SOURCES_DIR}/src/extern_gtest/googletest/include ${GTEST_INSTALL_DIR}/
+    BUILD_IN_SOURCE 1
+)
+
+ADD_DEPENDENCIES(extern_gtest snappy)
+
+ADD_LIBRARY(gtest STATIC IMPORTED GLOBAL)
+SET_PROPERTY(TARGET gtest PROPERTY IMPORTED_LOCATION ${GTEST_LIBRARIES})
+
+LIST(APPEND external_project_dependencies gtest)
 
-    INCLUDE(ExternalProject)
-
-    SET(GTEST_SOURCES_DIR ${THIRD_PARTY_PATH}/gtest)
-    SET(GTEST_INSTALL_DIR ${THIRD_PARTY_PATH}/install/gtest)
-    SET(GTEST_INCLUDE_DIR "${GTEST_INSTALL_DIR}/include" CACHE PATH "gtest include directory." FORCE)
-
-    INCLUDE_DIRECTORIES(${GTEST_INCLUDE_DIR})
-
-    IF(WIN32)
-        set(GTEST_LIBRARIES
-            "${GTEST_INSTALL_DIR}/lib/gtest.lib" CACHE FILEPATH "gtest libraries." FORCE)
-        set(GTEST_MAIN_LIBRARIES
-            "${GTEST_INSTALL_DIR}/lib/gtest_main.lib" CACHE FILEPATH "gtest main libraries." FORCE)
-    ELSE(WIN32)
-        set(GTEST_LIBRARIES
-            "${GTEST_INSTALL_DIR}/lib/libgtest.a" CACHE FILEPATH "gtest libraries." FORCE)
-        set(GTEST_MAIN_LIBRARIES
-            "${GTEST_INSTALL_DIR}/lib/libgtest_main.a" CACHE FILEPATH "gtest main libraries." FORCE)
-    ENDIF(WIN32)
-
-    IF(WITH_MKLML)
-        # wait for mklml downloading completed
-        SET(GTEST_DEPENDS   ${MKLML_PROJECT})
-    ENDIF()
-
-    ExternalProject_Add(
-        extern_gtest
-        ${EXTERNAL_PROJECT_LOG_ARGS}
-        DEPENDS         ${GTEST_DEPENDS}
-        GIT_REPOSITORY  "https://github.com/google/googletest.git"
-        GIT_TAG         "release-1.8.0"
-        PREFIX          ${GTEST_SOURCES_DIR}
-        UPDATE_COMMAND  ""
-        CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-                        -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-                        -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
-                        -DCMAKE_CXX_FLAGS_RELEASE=${CMAKE_CXX_FLAGS_RELEASE}
-                        -DCMAKE_CXX_FLAGS_DEBUG=${CMAKE_CXX_FLAGS_DEBUG}
-                        -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
-                        -DCMAKE_C_FLAGS_DEBUG=${CMAKE_C_FLAGS_DEBUG}
-                        -DCMAKE_C_FLAGS_RELEASE=${CMAKE_C_FLAGS_RELEASE}
-                        -DCMAKE_INSTALL_PREFIX=${GTEST_INSTALL_DIR}
-                        -DCMAKE_POSITION_INDEPENDENT_CODE=ON
-                        -DBUILD_GMOCK=ON
-                        -Dgtest_disable_pthreads=ON
-                        -Dgtest_force_shared_crt=ON
-                        -DCMAKE_BUILD_TYPE=${THIRD_PARTY_BUILD_TYPE}
-                        ${EXTERNAL_OPTIONAL_ARGS}
-        CMAKE_CACHE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${GTEST_INSTALL_DIR}
-                         -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON
-                         -DCMAKE_BUILD_TYPE:STRING=${THIRD_PARTY_BUILD_TYPE}
-    )
-
-    ADD_LIBRARY(gtest STATIC IMPORTED GLOBAL)
-    SET_PROPERTY(TARGET gtest PROPERTY IMPORTED_LOCATION ${GTEST_LIBRARIES})
-    ADD_DEPENDENCIES(gtest extern_gtest)
-
-    ADD_LIBRARY(gtest_main STATIC IMPORTED GLOBAL)
-    SET_PROPERTY(TARGET gtest_main PROPERTY IMPORTED_LOCATION ${GTEST_MAIN_LIBRARIES})
-    ADD_DEPENDENCIES(gtest_main extern_gtest)
-
-    LIST(APPEND external_project_dependencies gtest gtest_main)
-ENDIF(WITH_TESTING OR (WITH_DISTRIBUTE AND NOT WITH_GRPC))

cmake/external/protobuf.cmake

@@ -122,6 +122,15 @@ macro(PROMPT_PROTOBUF_LIB)
     # make `protobuf_generate_cpp` happy.
     SET(Protobuf_PROTOC_EXECUTABLE ${PROTOBUF_PROTOC_EXECUTABLE})
 
+    # For CMake 3.9 and above
+    if(NOT TARGET protobuf::protoc)
+        add_executable(protobuf::protoc IMPORTED)
+        if(EXISTS "${Protobuf_PROTOC_EXECUTABLE}")
+            set_target_properties(protobuf::protoc PROPERTIES
+                IMPORTED_LOCATION "${Protobuf_PROTOC_EXECUTABLE}")
+        endif()
+    endif()
+
     FOREACH(dep ${protobuf_DEPS})
         ADD_DEPENDENCIES(protobuf ${dep})
         ADD_DEPENDENCIES(protobuf_lite ${dep})

cmake/external/redis++.cmake

+# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+INCLUDE(ExternalProject)
+
+SET(REDISCLIENT_SOURCES_DIR ${THIRD_PARTY_PATH}/redis++)
+SET(REDISCLIENT_INSTALL_DIR ${THIRD_PARTY_PATH}/install/redis++)
+SET(REDISCLIENT_INCLUDE_DIR "${REDISCLIENT_INSTALL_DIR}/include" CACHE PATH "redis++ include directory." FORCE)
+SET(REDISCLIENT_LIBRARIES "${REDISCLIENT_INSTALL_DIR}/lib/libredis++.a" CACHE FILEPATH "redis++ library." FORCE)
+INCLUDE_DIRECTORIES(${REDISCLIENT_INCLUDE_DIR})
+
+ExternalProject_Add(
+    extern_redis++
+    ${EXTERNAL_PROJECT_LOG_ARGS}
+    PREFIX ${REDISCLIENT_SOURCES_DIR}
+    GIT_REPOSITORY "https://github.com/sewenew/redis-plus-plus"
+    GIT_TAG master
+    UPDATE_COMMAND ""
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND cmake . && CXXFLAGS=-fPIC make -j ${NUM_OF_PROCESSOR} static
+    INSTALL_COMMAND mkdir -p ${REDISCLIENT_INSTALL_DIR}/lib/ 
+    && cp ${REDISCLIENT_SOURCES_DIR}/src/extern_redis++/lib/libredis++.a ${REDISCLIENT_LIBRARIES}
+    && cp -r ${REDISCLIENT_SOURCES_DIR}/src/extern_redis++/src/sw/redis++/ ${REDISCLIENT_INSTALL_DIR}/include/redis++/
+    BUILD_IN_SOURCE 1
+)
+
+ADD_DEPENDENCIES(extern_redis++ snappy)
+
+ADD_LIBRARY(redis++ STATIC IMPORTED GLOBAL)
+SET_PROPERTY(TARGET redis++ PROPERTY IMPORTED_LOCATION ${ROCKSDB_LIBRARIES})
+ADD_DEPENDENCIES(redis++ extern_redis++)
+
+LIST(APPEND external_project_dependencies redis++)
+

cmake/external/rocksdb.cmake

+# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+INCLUDE(ExternalProject)
+
+SET(ROCKSDB_SOURCES_DIR ${THIRD_PARTY_PATH}/rocksdb)
+SET(ROCKSDB_INSTALL_DIR ${THIRD_PARTY_PATH}/install/rocksdb)
+SET(ROCKSDB_INCLUDE_DIR "${ROCKSDB_INSTALL_DIR}/include" CACHE PATH "rocksdb include directory." FORCE)
+SET(ROCKSDB_LIBRARIES "${ROCKSDB_INSTALL_DIR}/lib/librocksdb.a" CACHE FILEPATH "rocksdb library." FORCE)
+INCLUDE_DIRECTORIES(${ROCKSDB_INCLUDE_DIR})
+
+ExternalProject_Add(
+    extern_rocksdb
+    ${EXTERNAL_PROJECT_LOG_ARGS}
+    PREFIX ${ROCKSDB_SOURCES_DIR}
+    GIT_REPOSITORY "https://github.com/facebook/rocksdb"
+    GIT_TAG 6.2.fb
+    UPDATE_COMMAND ""
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND CXXFLAGS=-fPIC make -j ${NUM_OF_PROCESSOR} static_lib
+    INSTALL_COMMAND mkdir -p ${ROCKSDB_INSTALL_DIR}/lib/ 
+        && cp ${ROCKSDB_SOURCES_DIR}/src/extern_rocksdb/librocksdb.a ${ROCKSDB_LIBRARIES}
+        && cp -r ${ROCKSDB_SOURCES_DIR}/src/extern_rocksdb/include ${ROCKSDB_INSTALL_DIR}/
+    BUILD_IN_SOURCE 1
+)
+
+ADD_DEPENDENCIES(extern_rocksdb snappy)
+
+ADD_LIBRARY(rocksdb STATIC IMPORTED GLOBAL)
+SET_PROPERTY(TARGET rocksdb PROPERTY IMPORTED_LOCATION ${ROCKSDB_LIBRARIES})
+ADD_DEPENDENCIES(rocksdb extern_rocksdb)
+
+LIST(APPEND external_project_dependencies rocksdb)
+

demo-client/CMakeLists.txt

@@ -30,6 +30,11 @@ target_link_libraries(echo -Wl,--whole-archive sdk-cpp -Wl,--no-whole-archive
         -lpthread -lcrypto -lm -lrt -lssl -ldl
         -lz)
 
+add_executable(echo_kvdb ${CMAKE_CURRENT_LIST_DIR}/src/echo_kvdb.cpp)
+target_link_libraries(echo_kvdb -Wl,--whole-archive sdk-cpp -Wl,--no-whole-archive
+        -lpthread -lcrypto -lm -lrt -lssl -ldl
+         -lz)
+
 add_executable(dense_format ${CMAKE_CURRENT_LIST_DIR}/src/dense_format.cpp)
 target_link_libraries(dense_format -Wl,--whole-archive sdk-cpp -Wl,--no-whole-archive -lpthread -lcrypto -lm -lrt -lssl -ldl
         -lz)
@@ -69,6 +74,11 @@ install(TARGETS echo
 install(DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/conf DESTINATION
         ${PADDLE_SERVING_INSTALL_DIR}/demo/client/echo/)
 
+install(TARGETS echo_kvdb
+        RUNTIME DESTINATION ${PADDLE_SERVING_INSTALL_DIR}/demo/client/echo_kvdb/bin)
+install(DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/conf DESTINATION
+        ${PADDLE_SERVING_INSTALL_DIR}/demo/client/echo_kvdb/)
+
 install(TARGETS dense_format
         RUNTIME DESTINATION
         ${PADDLE_SERVING_INSTALL_DIR}/demo/client/dense_format/bin)

demo-client/conf/predictors.prototxt

@@ -109,3 +109,18 @@ predictors {
     }
   }
 }
+
+predictors {
+  name: "echo_kvdb_service"
+  service_name: "baidu.paddle_serving.predictor.echo_kvdb_service.EchoKVDBService"
+  endpoint_router: "WeightedRandomRender"
+  weighted_random_render_conf {
+    variant_weight_list: "50"
+  }
+  variants {
+    tag: "var1"
+    naming_conf {
+        cluster: "list://127.0.0.1:8010"
+    }
+  }
+}

demo-client/src/echo_kvdb.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <fstream>
+#include "sdk-cpp/builtin_format.pb.h"
+#include "sdk-cpp/echo_kvdb_service.pb.h"
+#include "sdk-cpp/include/common.h"
+#include "sdk-cpp/include/predictor_sdk.h"
+#include <algorithm>
+using baidu::paddle_serving::sdk_cpp::Predictor;
+using baidu::paddle_serving::sdk_cpp::PredictorApi;
+using baidu::paddle_serving::predictor::echo_kvdb_service::Request;
+using baidu::paddle_serving::predictor::echo_kvdb_service::Response;
+using baidu::paddle_serving::predictor::format::KVDBReq;
+using baidu::paddle_serving::predictor::format::KVDBRes;
+int global_key = 0;
+int create_req(Request& req) {  // NOLINT
+  KVDBReq* key = req.mutable_reqs()->Add();
+  key->set_op("SET");
+  key->set_key(std::to_string(global_key));
+  key->set_value(std::to_string(global_key * 1));
+
+  key = req.mutable_reqs()->Add();
+  key->set_op("GET");
+  key->set_key(std::to_string(global_key));
+  global_key++;
+  return 0;
+}
+
+void print_res(const Request& req,
+               const Response& res,
+               std::string route_tag,
+               uint64_t elapse_ms) {
+  LOG(INFO) << "Receive Response size: " << res.ress_size();
+  for (size_t i = 0; i < res.ress_size(); i++) {
+      KVDBRes val  = res.ress(i);
+      LOG(INFO) << "Receive value from demo-server: " << val.value();
+}
+  LOG(INFO) << "Succ call predictor[echo_kvdb_service], the tag is: " << route_tag
+            << ", elapse_ms: " << elapse_ms;
+}
+
+int main(int argc, char** argv) {
+  PredictorApi api;
+
+// initialize logger instance
+#ifdef BCLOUD
+  logging::LoggingSettings settings;
+  settings.logging_dest = logging::LOG_TO_FILE;
+
+  std::string filename(argv[0]);
+  filename = filename.substr(filename.find_last_of('/') + 1);
+  settings.log_file = (std::string("./log/") + filename + ".log").c_str();
+  settings.delete_old = logging::DELETE_OLD_LOG_FILE;
+  logging::InitLogging(settings);
+
+  logging::ComlogSinkOptions cso;
+  cso.process_name = filename;
+  cso.enable_wf_device = true;
+  logging::ComlogSink::GetInstance()->Setup(&cso);
+#else
+  struct stat st_buf;
+  int ret = 0;
+  if ((ret = stat("./log", &st_buf)) != 0) {
+    mkdir("./log", 0777);
+    ret = stat("./log", &st_buf);
+    if (ret != 0) {
+      LOG(WARNING) << "Log path ./log not exist, and create fail";
+      return -1;
+    }
+  }
+  FLAGS_log_dir = "./log";
+  google::InitGoogleLogging(strdup(argv[0]));
+#endif
+
+  if (api.create("./conf", "predictors.prototxt") != 0) {
+    LOG(ERROR) << "Failed create predictors api!";
+    return -1;
+  }
+
+  Request req;
+  Response res;
+
+  api.thrd_initialize();
+
+  while (true) {
+    if (global_key > 10000) {
+        break;
+    }
+    timeval start;
+    gettimeofday(&start, NULL);
+
+    api.thrd_clear();
+
+    Predictor* predictor = api.fetch_predictor("echo_kvdb_service");
+    if (!predictor) {
+      LOG(ERROR) << "Failed fetch predictor: echo_kvdb_service";
+      return -1;
+    }
+
+    req.Clear();
+    res.Clear();
+
+    if (create_req(req) != 0) {
+      return -1;
+    }
+
+    butil::IOBufBuilder debug_os;
+    if (predictor->debug(&req, &res, &debug_os) != 0) {
+      LOG(ERROR) << "failed call predictor with req:" << req.ShortDebugString();
+      return -1;
+    }
+
+    butil::IOBuf debug_buf;
+    debug_os.move_to(debug_buf);
+    LOG(INFO) << "Debug string: " << debug_buf;
+
+    timeval end;
+    gettimeofday(&end, NULL);
+
+    uint64_t elapse_ms = (end.tv_sec * 1000 + end.tv_usec / 1000) -
+                         (start.tv_sec * 1000 + start.tv_usec / 1000);
+
+    print_res(req, res, predictor->tag(), elapse_ms);
+    res.Clear();
+
+    usleep(50);
+  }  // while (true)
+
+  api.thrd_finalize();
+  api.destroy();
+
+#ifndef BCLOUD
+  google::ShutdownGoogleLogging();
+#endif
+
+  return 0;
+}
+
+/* vim: set expandtab ts=4 sw=4 sts=4 tw=100: */

demo-serving/CMakeLists.txt

@@ -12,6 +12,7 @@ if (NOT EXISTS
                 )
 endif()
 
+include_directories(SYSTEM  ${CMAKE_CURRENT_LIST_DIR}/../kvdb/include)
 find_library(MKLML_LIBS NAMES libmklml_intel.so libiomp5.so)
 include(op/CMakeLists.txt)
 include(proto/CMakeLists.txt)
@@ -26,13 +27,27 @@ target_include_directories(serving PUBLIC
         )
 
 if(WITH_GPU)
-    target_link_libraries(serving ${CUDA_LIBRARIES} -Wl,--whole-archive fluid_gpu_engine
+    target_link_libraries(serving -Wl,--whole-archive fluid_gpu_engine
             -Wl,--no-whole-archive)
 endif()
+
+target_link_libraries(serving -Wl,--whole-archive fluid_cpu_engine
+        -Wl,--no-whole-archive)
+
+target_link_libraries(serving paddle_fluid ${paddle_depend_libs})
+
 target_link_libraries(serving opencv_imgcodecs
-        ${opencv_depend_libs} -Wl,--whole-archive fluid_cpu_engine
-        -Wl,--no-whole-archive pdserving paddle_fluid ${paddle_depend_libs}
-        ${MKLML_LIB} ${MKLML_IOMP_LIB} -lpthread -lcrypto -lm -lrt -lssl -ldl -lz)
+        ${opencv_depend_libs})
+
+target_link_libraries(serving pdserving)
+
+target_link_libraries(serving kvdb rocksdb)
+
+if(WITH_GPU)
+    target_link_libraries(serving ${CUDA_LIBRARIES})
+endif()
+target_link_libraries(serving ${MKLML_LIB} ${MKLML_IOMP_LIB} -lpthread
+        -lcrypto -lm -lrt -lssl -ldl -lz -lbz2)
 
 install(TARGETS serving
         RUNTIME DESTINATION

demo-serving/conf/service.prototxt

@@ -27,3 +27,7 @@ services {
   workflows: "workflow6"
 }
 
+services {
+  name: "EchoKVDBService"
+  workflows: "workflow7"
+}

demo-serving/conf/workflow.prototxt

@@ -67,4 +67,11 @@ workflows {
     type: "TextClassificationOp"
   }
 }
-
+workflows {
+  name: "workflow7"
+  workflow_type: "Sequence"
+  nodes {
+    name: "echo_kvdb_service_op"
+    type: "KVDBEchoOp"
+  } 
+}

demo-serving/op/kvdb_echo_op.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "demo-serving/op/kvdb_echo_op.h"
+
+namespace baidu {
+namespace paddle_serving {
+namespace predictor {
+
+using baidu::paddle_serving::predictor::format::KVDBReq;
+using baidu::paddle_serving::predictor::format::KVDBRes;
+using baidu::paddle_serving::predictor::echo_kvdb_service::Request;
+using baidu::paddle_serving::predictor::echo_kvdb_service::Response;
+
+int KVDBEchoOp::inference() {
+    debug();
+}
+int KVDBEchoOp::debug() {
+   //TODO: implement DEBUG mode
+    baidu::paddle_serving::predictor::Resource& resource = baidu::paddle_serving::predictor::Resource::instance();
+    std::shared_ptr<RocksDBWrapper> db = resource.getDB();
+    const Request* req = dynamic_cast<const Request*>(get_request_message());
+    Response* res = mutable_data<Response>();
+    LOG(INFO) << "Receive request in KVDB echo service: " << req->ShortDebugString();
+    for (size_t i = 0; i < req->reqs_size(); i++) {
+        auto kvdbreq = req->reqs(i);
+        std::string op = kvdbreq.op();
+        std::string key = kvdbreq.key();
+        std::string val = kvdbreq.value();
+        if (op == "SET") {
+            db->Put(key, val);
+            KVDBRes* kvdb_value_res = res->mutable_ress()->Add();
+            kvdb_value_res -> set_value("OK");
+        } else if (op == "GET") {
+            std::string getvalue = db->Get(key);
+            KVDBRes* kvdb_value_res = res->mutable_ress()->Add();
+            kvdb_value_res -> set_value(getvalue);
+        }
+    }
+    return 0;
+}
+
+
+
+DEFINE_OP(KVDBEchoOp);
+}
+}
+}

demo-serving/op/kvdb_echo_op.h

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include "demo-serving/echo_kvdb_service.pb.h"
+#include "predictor/framework/resource.h"
+#include "predictor/common/inner_common.h"
+#include "predictor/framework/channel.h"
+#include "predictor/framework/op_repository.h"
+#include "predictor/op/op.h"
+#include "kvdb/paddle_rocksdb.h"
+
+namespace baidu {
+namespace paddle_serving {
+namespace predictor {
+
+class KVDBEchoOp: public OpWithChannel<baidu::paddle_serving::predictor::echo_kvdb_service::Response> {
+  public:
+      DECLARE_OP(KVDBEchoOp);
+      int inference();
+      int debug();
+      
+};
+}  //  namespace predictor
+}  //  namespace paddle_serving
+}  //  namespace baidu

demo-serving/proto/CMakeLists.txt

@@ -3,6 +3,7 @@ LIST(APPEND protofiles
         ${CMAKE_CURRENT_LIST_DIR}/dense_service.proto
         ${CMAKE_CURRENT_LIST_DIR}/sparse_service.proto
         ${CMAKE_CURRENT_LIST_DIR}/echo_service.proto
+        ${CMAKE_CURRENT_LIST_DIR}/echo_kvdb_service.proto
         ${CMAKE_CURRENT_LIST_DIR}/int64tensor_service.proto
         ${CMAKE_CURRENT_LIST_DIR}/text_classification.proto
 )

demo-serving/proto/echo_kvdb_service.proto

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+import "pds_option.proto";
+import "builtin_format.proto";
+package baidu.paddle_serving.predictor.echo_kvdb_service;
+
+option cc_generic_services = true;
+
+message Request {
+    repeated baidu.paddle_serving.predictor.format.KVDBReq reqs = 1;
+};
+
+message Response {
+    repeated baidu.paddle_serving.predictor.format.KVDBRes ress = 1;
+};
+
+service EchoKVDBService {
+    rpc inference(Request) returns (Response);
+    rpc debug(Request) returns (Response);
+    option (pds.options).generate_impl = true;
+};

kvdb/CMakeLists.txt

+
+include_directories(SYSTEM ${CMAKE_CURRENT_LIST_DIR}/include)
+
+set(SRC_LIST ${CMAKE_CURRENT_LIST_DIR}/src/test_rocksdb.cpp 
+            ${CMAKE_CURRENT_LIST_DIR}/src/rockskvdb_impl.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/param_dict_mgr_impl.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/mock_param_dict_impl.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/paddle_rocksdb.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/gtest_kvdb.cpp)
+       
+add_library(kvdb ${SRC_LIST})
+install(TARGETS kvdb ARCHIVE DESTINATION ${PADDLE_SERVING_INSTALL_DIR}/lib/)
+
+add_executable(kvdb_test ${SRC_LIST})
+add_dependencies(kvdb_test rocksdb)
+target_link_libraries(kvdb_test rocksdb bz2 snappy zlib gtest)
+#target_include_directories(kvdb_test PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include/kvdb)
+
+set(SRC_LIST2 ${CMAKE_CURRENT_LIST_DIR}/src/gtest_db_thread.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/rockskvdb_impl.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/param_dict_mgr_impl.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/mock_param_dict_impl.cpp
+            ${CMAKE_CURRENT_LIST_DIR}/src/paddle_rocksdb.cpp)
+
+
+add_executable(db_thread ${SRC_LIST2})
+add_dependencies(db_thread rocksdb)
+target_link_libraries(db_thread rocksdb bz2 snappy zlib gtest)
+#target_include_directories(db_thread PUBLIC  ${CMAKE_CURRENT_LIST_DIR}/include/kvdb)
+
+
+set(SRC_LIST3 ${CMAKE_CURRENT_LIST_DIR}/src/gtest_db_func.cpp
+             ${CMAKE_CURRENT_LIST_DIR}/src/rockskvdb_impl.cpp
+             ${CMAKE_CURRENT_LIST_DIR}/src/param_dict_mgr_impl.cpp
+             ${CMAKE_CURRENT_LIST_DIR}/src/mock_param_dict_impl.cpp
+             ${CMAKE_CURRENT_LIST_DIR}/src/paddle_rocksdb.cpp)
+
+add_executable(db_func ${SRC_LIST3})
+add_dependencies(db_func rocksdb)
+target_link_libraries(db_func rocksdb bz2 snappy zlib gtest)
+#target_include_directories(db_func PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include/kvdb)
+
+install(TARGETS kvdb_test 
+        RUNTIME DESTINATION ${PADDLE_SERVING_INSTALL_DIR}/demo/kvdb_test)
+install(TARGETS db_thread
+        RUNTIME DESTINATION ${PADDLE_SERVING_INSTALL_DIR}/demo/db_thread)
+install(TARGETS db_func
+        RUNTIME DESTINATION ${PADDLE_SERVING_INSTALL_DIR}/demo/db_func)
+
+
+file(GLOB kvdb_headers "${CMAKE_CURRENT_LIST_DIR}/include/kvdb/*.h")
+install(FILES ${kvdb_headers} DESTINATION
+      ${PADDLE_SERVING_INSTALL_DIR}/include/kvdb/)

kvdb/include/kvdb/kvdb_impl.h

+
+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include <vector>
+#include <unordered_map>
+#include <memory>
+#include <chrono>
+class AbstractKVDB;
+class FileReader;
+class ParamDict;
+
+typedef std::shared_ptr<AbstractKVDB> AbsKVDBPtr;
+typedef std::shared_ptr<FileReader> FileReaderPtr;
+typedef std::shared_ptr<ParamDict> ParamDictPtr;
+
+class AbstractKVDB {
+public:
+    virtual void CreateDB() = 0;
+    virtual void SetDBName(std::string) = 0;
+    virtual void Set(std::string key, std::string value) = 0;
+    virtual std::string Get(std::string key) = 0;
+    virtual ~AbstractKVDB() = 0;
+};
+
+// TODO: Implement RedisKVDB
+//class RedisKVDB;
+
+class FileReader {
+public:
+    inline virtual std::string GetFileName() {
+        return this->filename_;
+    }
+    
+    inline virtual void SetFileName(std::string filename) {
+        this->filename_ = filename;
+        this->last_md5_val_ = this->GetMD5();
+        this->time_stamp_ = std::chrono::system_clock::now();
+    }
+    
+    inline virtual std::string GetMD5() {
+        auto getCmdOut = [] (std::string cmd) {
+            std::string data;
+            FILE *stream = nullptr;
+            const int max_buffer = 256;
+            char buffer[max_buffer];
+            cmd.append(" 2>&1");
+            stream = popen(cmd.c_str(), "r");
+            if (stream) {
+                if (fgets(buffer, max_buffer, stream) != NULL) {
+                    data.append(buffer);
+                }
+            }
+            return data;
+        };
+        std::string cmd = "md5sum " + this->filename_;
+        //TODO: throw exception if error occurs during execution of shell command
+        std::string md5val = getCmdOut(cmd);
+        this->time_stamp_ = md5val == this->last_md5_val_? this->time_stamp_: std::chrono::system_clock::now();
+        this->last_md5_val_ = md5val;
+        return md5val;
+    }
+    
+    inline virtual bool CheckDiff() {
+        return this->GetMD5() == this->last_md5_val_;
+    }
+
+    inline virtual std::chrono::system_clock::time_point GetTimeStamp() {
+        return this->time_stamp_; 
+    } 
+
+    inline virtual ~FileReader() {};
+protected:
+    std::string filename_;
+    std::string last_md5_val_;
+    std::chrono::system_clock::time_point time_stamp_;
+};
+
+
+class ParamDict {
+    typedef std::string Key;
+    typedef std::vector<std::string> Value;
+public:
+    virtual std::vector<FileReaderPtr> GetDictReaderLst();
+    virtual void SetFileReaderLst(std::vector<std::string> lst);
+
+    virtual std::vector<float> GetSparseValue(int64_t, int64_t);
+    virtual std::vector<float> GetSparseValue(std::string, std::string);
+    
+    virtual bool InsertSparseValue(int64_t, int64_t, const std::vector<float>&);
+    virtual bool InsertSparseValue(std::string, std::string, const std::vector<float>&);
+
+    virtual void SetReader(std::function<std::pair<Key, Value>(std::string)>);
+    virtual void UpdateBaseModel();
+    virtual void UpdateDeltaModel();
+
+    virtual std::pair<AbsKVDBPtr, AbsKVDBPtr> GetKVDB();
+    virtual void SetKVDB(std::pair<AbsKVDBPtr, AbsKVDBPtr>);
+    virtual void CreateKVDB();
+    
+    virtual ~ParamDict();
+protected:
+    std::function<std::pair<Key, Value>(std::string)> read_func_;
+    std::vector<FileReaderPtr> file_reader_lst_;
+    AbsKVDBPtr front_db, back_db;
+};
+
+
+
+class ParamDictMgr {
+public:
+    void UpdateAll();
+    void InsertParamDict(std::string, ParamDictPtr);
+
+protected:
+    std::unordered_map<std::string, ParamDictPtr> ParamDictMap;
+};
+

kvdb/include/kvdb/paddle_rocksdb.h

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include <memory>
+#include <string>
+#include "rocksdb/db.h"
+#include "rocksdb/options.h"
+#include "rocksdb/slice.h"
+#include "rocksdb/sst_file_writer.h"
+#include "rocksdb/table.h"
+#include "rocksdb/compaction_filter.h"
+#include "rocksdb/filter_policy.h"
+
+
+class RocksDBWrapper {
+public:
+    RocksDBWrapper(std::string db_name);
+    std::string Get(std::string key);
+
+    bool Put(std::string key, std::string value);
+    void SetDBName(std::string db_name);
+    static std::shared_ptr<RocksDBWrapper> RocksDBWrapperFactory(std::string db_name = "SparseMatrix");
+
+protected:
+    rocksdb::DB *db_;
+    std::string db_name_;
+};
+

kvdb/include/kvdb/rocksdb_impl.h

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include "kvdb_impl.h"
+#include "paddle_rocksdb.h"
+class RocksKVDB: public AbstractKVDB {
+public:
+    void CreateDB();
+    void SetDBName(std::string);
+    void Set(std::string key, std::string value);
+    std::string Get(std::string key);
+    ~RocksKVDB();
+
+protected:
+    std::shared_ptr<RocksDBWrapper> db_;
+
+public:
+    static int db_count;
+};
+
+
+
+

kvdb/src/gtest_db_func.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/rocksdb_impl.h"
+#include "kvdb/kvdb_impl.h"
+#include "kvdb/paddle_rocksdb.h"
+#include <gtest/gtest.h>
+#include <string>
+#include <fstream>
+#include <sstream>
+#include <chrono>
+#include <thread>
+class KVDBTest : public ::testing::Test {
+protected:
+    void SetUp() override{
+                
+    }
+    
+    static void SetUpTestCase() {
+    }
+    
+
+};
+int my_argc;
+char** my_argv;
+
+std::vector<std::string> StringSplit(std::string str, char split) {
+    std::vector<std::string> strs;
+    std::istringstream f(str);
+    std:: string s;
+    while (getline(f, s, split)) {
+        strs.push_back(s);
+    }
+    return strs;
+}
+
+TEST_F(KVDBTest, AbstractKVDB_Func_Test) {
+    AbsKVDBPtr kvdb = std::make_shared<RocksKVDB>();
+    kvdb->CreateDB();
+    std::string set_list = "setlist.txt";
+    std::string get_list = "getlist.txt";
+    std::ifstream set_file(set_list);
+    std::ifstream get_file(get_list);
+    for (std::string line; getline(set_file, line); )
+    {
+        std::vector<std::string> strs = StringSplit (line, ' ');
+        kvdb->Set(strs[0], strs[1]);
+    }
+
+    for (std::string line; getline(get_file, line); ) {
+        std::vector<std::string> strs = StringSplit(line, ' ');
+        std::string val = kvdb->Get(strs[0]);
+        ASSERT_EQ(val, strs[1]);
+    }
+}
+
+
+
+int main(int argc, char** argv) {
+    my_argc = argc;
+    my_argv = argv;
+    ::testing::InitGoogleTest(&argc, argv);
+     return RUN_ALL_TESTS();
+}
+

kvdb/src/gtest_db_thread.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/rocksdb_impl.h"
+#include "kvdb/kvdb_impl.h"
+#include "kvdb/paddle_rocksdb.h"
+#include <gtest/gtest.h>
+#include <string>
+#include <fstream>
+#include <chrono>
+#include <thread>
+class KVDBTest : public ::testing::Test {
+protected:
+    void SetUp() override{
+                
+    }
+    
+    static void SetUpTestCase() {
+
+    }
+};
+int my_argc;
+char** my_argv;
+
+
+void db_thread_test(AbsKVDBPtr kvdb, int size) {
+    for (int i = 0; i < size; i++) {
+        kvdb->Set(std::to_string(i), std::to_string(i));
+        kvdb->Get(std::to_string(i));
+    }
+}
+
+TEST_F(KVDBTest, AbstractKVDB_Thread_Test) {
+    if (my_argc != 3) {
+        std::cerr << "illegal input! should be db_thread ${num_of_thread} ${num_of_ops_each_thread}" << std::endl;
+        return;
+    }
+    int num_of_thread = atoi(my_argv[1]);
+    int nums_of_ops_each_thread = atoi(my_argv[2]);
+    std::vector<AbsKVDBPtr> kvdbptrs;
+    for (int i= 0; i < num_of_thread; i++) {
+        kvdbptrs.push_back(std::make_shared<RocksKVDB>());
+        kvdbptrs[i]->CreateDB();
+    }
+    std::vector<std::thread> tarr;
+    for (int i = 0; i< num_of_thread; i++) {
+        tarr.push_back(std::thread(db_thread_test, kvdbptrs[i], nums_of_ops_each_thread));
+    }
+    for (int i = 0; i< num_of_thread; i++) {
+        tarr[i].join();
+    }
+    return;
+}
+
+
+
+int main(int argc, char** argv) {
+    my_argc = argc;
+    my_argv = argv;
+    ::testing::InitGoogleTest(&argc, argv);
+     return RUN_ALL_TESTS();
+}
+

kvdb/src/gtest_kvdb.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/rocksdb_impl.h"
+#include "kvdb/kvdb_impl.h"
+#include "kvdb/paddle_rocksdb.h"
+#include <gtest/gtest.h>
+#include <functional>
+#include <string>
+#include <fstream>
+#include <chrono>
+#include <thread>
+class KVDBTest : public ::testing::Test {
+protected:
+    void SetUp() override{
+                
+    }
+    
+    static void SetUpTestCase() {
+        kvdb = std::make_shared<RocksKVDB>();
+        dict_reader = std::make_shared<FileReader>();
+        param_dict = std::make_shared<ParamDict>();
+    }
+    
+    static AbsKVDBPtr kvdb;
+    static FileReaderPtr dict_reader;
+    static ParamDictPtr param_dict;
+    static ParamDictMgr dict_mgr;
+
+};
+AbsKVDBPtr KVDBTest::kvdb;
+FileReaderPtr KVDBTest::dict_reader;
+ParamDictPtr KVDBTest::param_dict;
+ParamDictMgr KVDBTest::dict_mgr;
+
+void GenerateTestIn(std::string);
+void UpdateTestIn(std::string);
+
+TEST_F(KVDBTest, AbstractKVDB_Unit_Test) {
+    kvdb->CreateDB();
+    kvdb->SetDBName("test_kvdb");
+    for (int i = 0; i < 100; i++) {
+        kvdb->Set(std::to_string(i), std::to_string(i * 2));
+    }
+    for (int i = 0; i < 100; i++) {
+        std::string val = kvdb->Get(std::to_string(i));
+        ASSERT_EQ(val, std::to_string(i * 2));
+    }
+}
+
+TEST_F(KVDBTest, FileReader_Unit_Test) {
+    std::string test_in_filename = "abs_dict_reader_test_in.txt";
+    GenerateTestIn(test_in_filename);
+    dict_reader->SetFileName(test_in_filename);
+
+    std::string md5_1 = dict_reader->GetMD5();
+    std::chrono::system_clock::time_point timestamp_1 = dict_reader->GetTimeStamp();
+
+    std::string md5_2 = dict_reader->GetMD5();
+    std::chrono::system_clock::time_point timestamp_2 = dict_reader->GetTimeStamp();
+    
+    ASSERT_EQ(md5_1, md5_2);
+    ASSERT_EQ(timestamp_1, timestamp_2);
+
+    UpdateTestIn(test_in_filename);
+
+    std::string md5_3 = dict_reader->GetMD5();
+    std::chrono::system_clock::time_point timestamp_3 = dict_reader->GetTimeStamp();
+    
+    ASSERT_NE(md5_2, md5_3);
+    ASSERT_NE(timestamp_2, timestamp_3);   
+}
+#include <cmath>
+TEST_F(KVDBTest, ParamDict_Unit_Test) {
+    std::string test_in_filename = "abs_dict_reader_test_in.txt";
+    param_dict->SetFileReaderLst({test_in_filename});
+    param_dict->SetReader(
+    [] (std::string text) {
+      auto split = [](const std::string& s,
+                 std::vector<std::string>& sv,
+                 const char* delim = " ") {
+        sv.clear();
+        char* buffer = new char[s.size() + 1];
+        std::copy(s.begin(), s.end(), buffer);
+        char* p = strtok(buffer, delim);
+        do {
+          sv.push_back(p);
+        } while ((p = strtok(NULL, delim)));
+        return;
+      };
+      std::vector<std::string> text_split;
+      split(text, text_split, " ");
+      std::string key = text_split[0];
+      text_split.erase(text_split.begin());
+      return make_pair(key, text_split);            
+    });
+    param_dict->CreateKVDB();
+    GenerateTestIn(test_in_filename);
+
+    param_dict->UpdateBaseModel();
+
+    std::this_thread::sleep_for(std::chrono::seconds(2));
+    
+    std::vector<float> test_vec = param_dict->GetSparseValue("1", "");
+
+    ASSERT_LT(fabs(test_vec[0] - 1.0), 1e-2);
+
+    UpdateTestIn(test_in_filename);
+    param_dict->UpdateDeltaModel();
+}
+
+void GenerateTestIn(std::string filename) {
+    std::ifstream in_file(filename);
+    if (in_file.good()) {
+        in_file.close();
+        std::string cmd = "rm -rf "+ filename;
+        system(cmd.c_str());
+    }
+    std::ofstream out_file(filename);
+    for (size_t i = 0; i < 100000; i++) {
+        out_file << i << " " << i << " ";
+        for (size_t j = 0; j < 3; j++) {
+            out_file << i << " ";
+        }
+        out_file << std::endl;
+    }
+    out_file.close();
+}
+
+void UpdateTestIn(std::string filename) {
+    std::ifstream in_file(filename);
+    if (in_file.good()) {
+        in_file.close();
+        std::string cmd = "rm -rf " + filename;
+        system(cmd.c_str());
+    }
+    std::ofstream out_file(filename);
+    for (size_t i = 0; i < 10000; i++) {
+        out_file << i << " " << i << " ";
+        for (size_t j = 0; j < 3; j++) {
+            out_file << i + 1 << " ";
+        }
+        out_file << std::endl;
+    }
+    out_file.close();
+}
+
+int main(int argc, char** argv) {
+     ::testing::InitGoogleTest(&argc, argv);
+     return RUN_ALL_TESTS();
+}
+

kvdb/src/mock_param_dict_impl.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/rocksdb_impl.h"
+#include <thread>
+#include <iterator>
+#include <fstream>
+#include <algorithm>
+#include <sstream>
+
+std::vector<FileReaderPtr> ParamDict::GetDictReaderLst() {
+    return this->file_reader_lst_;
+}
+
+void ParamDict::SetFileReaderLst(std::vector<std::string> lst) {
+    for (size_t i = 0; i < lst.size(); i++) {
+        FileReaderPtr fr = std::make_shared<FileReader>();
+        fr->SetFileName(lst[i]);
+        this->file_reader_lst_.push_back(fr);
+    }
+}
+
+std::vector<float> ParamDict::GetSparseValue(std::string feasign, std::string slot) {
+    auto BytesToFloat = [](uint8_t* byteArray){
+        return *((float*)byteArray);
+    };
+    //TODO: the concatation of feasign and slot is TBD.
+    std::string result = front_db->Get(feasign + slot);
+    std::vector<float> value;
+    if (result == "NOT_FOUND") 
+        return value;
+    uint8_t* raw_values_ptr = reinterpret_cast<uint8_t *>(&result[0]);
+    for (size_t i = 0; i < result.size(); i += 4) {
+        float temp = BytesToFloat(raw_values_ptr + i);
+        value.push_back(temp);
+    }
+    return value;
+}
+
+void ParamDict::SetReader(std::function<std::pair<Key, Value>(std::string)> func) {
+    read_func_ = func;
+}
+
+std::vector<float> ParamDict::GetSparseValue(int64_t feasign, int64_t slot) {
+    return this->GetSparseValue(std::to_string(feasign), std::to_string(slot));
+}
+
+bool ParamDict::InsertSparseValue(int64_t feasign, int64_t slot, const std::vector<float>& values) {
+    return this->InsertSparseValue(std::to_string(feasign), std::to_string(slot), values);       
+}
+
+bool ParamDict::InsertSparseValue(std::string feasign, std::string slot, const std::vector<float>& values) {
+    auto FloatToBytes = [](float fvalue, uint8_t *arr){
+        unsigned char  *pf = nullptr;
+        unsigned char *px = nullptr;
+        unsigned char i = 0;
+        pf =(unsigned char *)&fvalue;
+        px = arr;
+        for (i = 0; i < 4; i++)
+        {
+            *(px+i)=*(pf+i);
+        }
+    };
+
+    std::string key = feasign + slot;
+    uint8_t* values_ptr = new uint8_t[values.size() * 4];
+    std::string value;
+    for (size_t i = 0; i < values.size(); i++) {
+        FloatToBytes(values[i], values_ptr + 4 * i);
+    }
+    char* raw_values_ptr = reinterpret_cast<char*>(values_ptr);
+    for (size_t i = 0; i < values.size()*4; i++) {
+        value.push_back(raw_values_ptr[i]);
+    }
+    back_db->Set(key, value);
+//TODO: change stateless to stateful
+    return true;
+}
+
+void ParamDict::UpdateBaseModel() {
+    auto is_number = [] (const std::string& s)
+    {
+        return !s.empty() && std::find_if(s.begin(), 
+                        s.end(), [](char c) { return !std::isdigit(c); }) == s.end();
+    };
+   std::thread t([&] () {
+        for (FileReaderPtr file_reader: this->file_reader_lst_) {
+            std::string line;
+            std::ifstream infile(file_reader->GetFileName());
+            if (infile.is_open()) {
+                while (getline(infile, line)) {
+                    std::pair<Key, Value> kvpair = read_func_(line);
+                    std::vector<float> nums;
+                    for (size_t i = 0; i < kvpair.second.size(); i++) {
+                        if (is_number(kvpair.second[i])) {
+                            nums.push_back(std::stof(kvpair.second[i]));
+                        }
+                    }
+                    this->InsertSparseValue(kvpair.first, "", nums);
+                }
+            }
+            infile.close();
+        }
+        AbsKVDBPtr temp = front_db;
+        front_db = back_db;
+        back_db = temp;
+   });
+   t.detach();
+}
+
+
+void ParamDict::UpdateDeltaModel() {
+    UpdateBaseModel();
+}
+
+std::pair<AbsKVDBPtr, AbsKVDBPtr> ParamDict::GetKVDB()  {
+    return {front_db, back_db};
+}
+
+void ParamDict::SetKVDB(std::pair<AbsKVDBPtr, AbsKVDBPtr> kvdbs) {
+    this->front_db = kvdbs.first;
+    this->back_db = kvdbs.second;
+}
+
+void ParamDict::CreateKVDB() {
+    this->front_db = std::make_shared<RocksKVDB>();
+    this->back_db = std::make_shared<RocksKVDB>();
+    this->front_db->CreateDB();
+    this->back_db->CreateDB();
+}
+
+ParamDict::~ParamDict() {
+
+}
+
+
+
+
+

kvdb/src/paddle_rocksdb.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/paddle_rocksdb.h"
+
+RocksDBWrapper::RocksDBWrapper(std::string db_name) {
+    rocksdb::Options options;
+    options.create_if_missing = true;
+    db_name_ = db_name;
+    db_ = nullptr;
+    rocksdb::Status s = rocksdb::DB::Open(options, db_name, &db_);
+    return;
+}
+
+std::string RocksDBWrapper::Get(std::string key) {
+    rocksdb::ReadOptions options;
+    options.verify_checksums = true;
+    std::string result;
+    rocksdb::Status s = db_->Get(options, key, &result);
+    if (s.IsNotFound()) {
+        result = "NOT_FOUND";
+    }
+    return result;
+}
+
+bool RocksDBWrapper::Put(std::string key, std::string value) {
+    rocksdb::WriteOptions options;
+    rocksdb::Status s = db_->Put(options, key, value);
+    if (s.ok()) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void RocksDBWrapper::SetDBName(std::string db_name) {
+    this->db_name_ = db_name;
+}
+
+std::shared_ptr<RocksDBWrapper> RocksDBWrapper::RocksDBWrapperFactory(std::string db_name) {
+    return std::make_shared<RocksDBWrapper>(db_name);
+}

kvdb/src/param_dict_mgr_impl.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/kvdb_impl.h"
+
+void ParamDictMgr::UpdateAll() {
+    for (auto it = this->ParamDictMap.begin(); it!= this->ParamDictMap.end(); ++it) {
+        it->second->UpdateBaseModel();
+    }
+
+}
+
+void ParamDictMgr::InsertParamDict(std::string key, ParamDictPtr value) {
+    this->ParamDictMap.insert(std::make_pair(key, value));
+}
+
+AbstractKVDB::~AbstractKVDB() {}

kvdb/src/rockskvdb_impl.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/rocksdb_impl.h"
+
+int RocksKVDB::db_count;
+void RocksKVDB::CreateDB() {
+    this->db_ = RocksDBWrapper::RocksDBWrapperFactory("RocksDB_" + std::to_string(RocksKVDB::db_count));
+    RocksKVDB::db_count ++;
+    return;
+}
+
+void RocksKVDB::SetDBName(std::string db_name) {
+    this->db_->SetDBName(db_name);
+    return;
+}
+
+void RocksKVDB::Set(std::string key, std::string value) {
+    this->db_->Put(key, value);
+    return;
+}
+
+std::string RocksKVDB::Get(std::string key) {
+    return this->db_->Get(key);
+}
+
+RocksKVDB::~RocksKVDB() {
+    
+}
+
+
+
+

kvdb/src/test_rocksdb.cpp

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "kvdb/rocksdb_impl.h"
+#include "kvdb/paddle_rocksdb.h"
+#include <iostream>
+void test_rockskvdb() {
+    RocksKVDB db;
+    db.CreateDB();
+    db.SetDBName("Sparse Matrix");
+    db.Set("1", "One");
+    std::cout << db.Get("1") << std::endl;
+    return ;
+}
+
+void test_rocksdbwrapper() {
+    std::shared_ptr<RocksDBWrapper> db = RocksDBWrapper::RocksDBWrapperFactory("TEST");
+    for (size_t i = 0; i < 1000; i++) {
+        db->Put(std::to_string(i), std::to_string(i * 2));
+    } 
+    for (size_t i = 0; i < 1000; i++) {
+        std::string res = db->Get(std::to_string(i));
+        std::cout << res << " ";
+    }
+    std::cout << std::endl;
+}
+
+#ifdef RAW_TEST
+int main() {
+    test_rockskvdb();   
+    test_rocksdbwrapper();
+}
+#endif
+
+
+
+

predictor/CMakeLists.txt

@@ -6,15 +6,17 @@ include(framework/CMakeLists.txt)
 #include(plugin/CMakeLists.txt)
 include(src/CMakeLists.txt)
 
+include_directories(SYSTEM  ${CMAKE_CURRENT_LIST_DIR}/../kvdb/include)
+
 add_library(pdserving ${pdserving_srcs})
 set_source_files_properties(
         ${pdserving_srcs}
         PROPERTIES
         COMPILE_FLAGS  "-Wno-strict-aliasing -Wno-unused-variable -Wno-non-virtual-dtor -Wno-error=non-virtual-dtor -Wno-error=delete-non-virtual-dtor")
-add_dependencies(pdserving protobuf boost brpc leveldb pdcodegen configure)
+add_dependencies(pdserving protobuf kvdb boost brpc leveldb pdcodegen configure)
 
 target_link_libraries(pdserving
-        brpc protobuf boost leveldb configure -lpthread -lcrypto -lm -lrt -lssl -ldl -lz)
+        brpc protobuf boost leveldb configure kvdb -lpthread -lcrypto -lm -lrt -lssl -ldl -lz)
 
 # install
 install(TARGETS pdserving

predictor/conf/echo_kvdb_dag.conf

+workflow_type: Sequence
+[@Node]
+name: echo_kvdb_op
+type: KVDBEchoOp

predictor/conf/workflow.conf

@@ -13,3 +13,7 @@ name: workflow3
 path: ./conf
 file: echo_dag.conf
 
+[@Workflow]
+name: workflow7
+path: ./conf
+file: echo_kvdb_dag.conf

predictor/framework/resource.cpp

@@ -36,7 +36,13 @@ DynamicResource::DynamicResource() {}
 
 DynamicResource::~DynamicResource() {}
 
-int DynamicResource::initialize() { return 0; }
+int DynamicResource::initialize() { 
+    return 0;
+}
+
+std::shared_ptr<RocksDBWrapper> Resource::getDB() {
+    return db;
+}
 
 int DynamicResource::clear() { return 0; }
 
@@ -80,6 +86,11 @@ int Resource::initialize(const std::string& path, const std::string& file) {
     LOG(ERROR) << "unable to create tls_bthread_key of thrd_data";
     return -1;
   }
+    //init rocksDB instance
+  if (db.get() == nullptr) {
+    db = RocksDBWrapper::RocksDBWrapperFactory("kvdb");
+  }
+
   THREAD_SETSPECIFIC(_tls_bspec_key, NULL);
   return 0;
 }

predictor/framework/resource.h

@@ -16,6 +16,7 @@
 #include <string>
 #include "predictor/common/inner_common.h"
 #include "predictor/framework/memory.h"
+#include "kvdb/paddle_rocksdb.h"
 
 namespace baidu {
 namespace paddle_serving {
@@ -30,6 +31,7 @@ struct DynamicResource {
   int initialize();
 
   int clear();
+
 };
 
 class Resource {
@@ -53,6 +55,8 @@ class Resource {
 
   int finalize();
 
+  std::shared_ptr<RocksDBWrapper> getDB();
+
   DynamicResource* get_dynamic_resource() {
     return reinterpret_cast<DynamicResource*>(
         THREAD_GETSPECIFIC(_tls_bspec_key));
@@ -60,7 +64,8 @@ class Resource {
 
  private:
   int thread_finalize() { return 0; }
-
+  std::shared_ptr<RocksDBWrapper> db;
+  
   THREAD_KEY_T _tls_bspec_key;
 };
 

predictor/proto/builtin_format.proto

@@ -15,6 +15,19 @@
 syntax = "proto2";
 package baidu.paddle_serving.predictor.format;
 
+// echo kvdb formant
+message KVDBReq {
+    required string op = 1;
+    required string key = 2;
+    optional string value = 3;
+    
+};
+message KVDBRes{
+    required string value = 2;     
+};
+
+
+
 // dense format
 message DenseInstance { repeated float features = 1; };
 

sdk-cpp/proto/echo_kvdb_service.proto

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+import "pds_option.proto";
+import "builtin_format.proto";
+package baidu.paddle_serving.predictor.echo_kvdb_service;
+
+option cc_generic_services = true;
+
+message Request {
+    repeated baidu.paddle_serving.predictor.format.KVDBReq reqs = 1;
+};
+
+message Response {
+    repeated baidu.paddle_serving.predictor.format.KVDBRes ress = 1;
+};
+
+service EchoKVDBService {
+    rpc inference(Request) returns (Response);
+    rpc debug(Request) returns (Response);
+    option (pds.options).generate_stub = true;
+};