feat/tsdbCache: the first round tsdbCache

source/dnode/vnode/CMakeLists.txt

@@ -41,6 +41,7 @@ target_sources(
     "src/tsdb/tsdbMemTable.c"
     "src/tsdb/tsdbRead.c"
     "src/tsdb/tsdbReadImpl.c"
+    "src/tsdb/tsdbCache.c"
     "src/tsdb/tsdbWrite.c"
     "src/tsdb/tsdbReaderWriter.c"
     "src/tsdb/tsdbUtil.c"

source/dnode/vnode/src/inc/tsdb.h

@@ -198,6 +198,13 @@ int32_t tsdbDelFReaderClose(SDelFReader *pReader);
 int32_t tsdbReadDelData(SDelFReader *pReader, SDelIdx *pDelIdx, SMapData *pDelDataMap, uint8_t **ppBuf);
 int32_t tsdbReadDelIdx(SDelFReader *pReader, SMapData *pDelIdxMap, uint8_t **ppBuf);
 
+// tsdbCache
+int32_t tsdbOpenCache(STsdb *pTsdb);
+void tsdbCloseCache(SLRUCache *pCache);
+int32_t tsdbCacheInsertLastrow(SLRUCache *pCache, tb_uid_t uid, STSRow *row);
+int32_t tsdbCacheGetLastrow(SLRUCache *pCache, tb_uid_t uid, STSRow **ppRow);
+int32_t tsdbCacheDeleteLastrow(SLRUCache *pCache, tb_uid_t uid);
+
 // structs =======================
 typedef struct {
   int   minFid;
@@ -218,6 +225,7 @@ struct STsdb {
   SMemTable    *imem;
   SRtn          rtn;
   STsdbFS      *fs;
+  SLRUCache    *lruCache;
 };
 
 struct STable {

source/dnode/vnode/src/inc/vnodeInt.h

@@ -36,6 +36,7 @@
 #include "tmallocator.h"
 #include "tmsgcb.h"
 #include "tskiplist.h"
+#include "tlrucache.h"
 #include "tstream.h"
 #include "ttime.h"
 #include "ttimer.h"

source/dnode/vnode/src/tsdb/tsdbCache.c

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "tsdb.h"
+
+int32_t tsdbOpenCache(STsdb *pTsdb) {
+  int32_t code = 0;
+  SLRUCache *pCache = NULL;
+  size_t cfgCapacity = 1024 * 1024; // TODO: get cfg from tsdb config
+
+  pCache = taosLRUCacheInit(cfgCapacity, -1, .5);
+  if (pCache == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  taosLRUCacheSetStrictCapacity(pCache, true);
+
+_err:
+  pTsdb->lruCache = pCache;
+  return code;
+}
+
+void tsdbCloseCache(SLRUCache *pCache) {
+  if (pCache) {
+    taosLRUCacheEraseUnrefEntries(pCache);
+
+    taosLRUCacheCleanup(pCache);
+  }
+}
+
+static void getTableCacheKey(tb_uid_t uid, const char *cacheType, char *key, int *len) {
+  int keyLen = 0;
+
+  snprintf(key, 30, "%"PRIi64 "%s", uid, cacheType);
+  *len = strlen(key);
+}
+
+static void deleteTableCacheLastrow(const void *key, size_t keyLen, void *value) {
+  taosMemoryFree(value);
+}
+
+int32_t tsdbCacheInsertLastrow(SLRUCache *pCache, tb_uid_t uid, STSRow *row) {
+  int32_t code = 0;
+  STSRow *cacheRow = NULL;
+  char key[32] = {0};
+  int keyLen = 0;
+
+  getTableCacheKey(uid, "lr", key, &keyLen);
+  LRUHandle *h = taosLRUCacheLookup(pCache, key, keyLen);
+  if (h) {
+    cacheRow = (STSRow *) taosLRUCacheValue(pCache, h);
+    if (row->ts >= cacheRow->ts) {
+      if (row->ts > cacheRow->ts) {
+	tdRowCpy(cacheRow, row);
+      }
+    }
+  } else {
+    cacheRow = tdRowDup(row);
+
+    _taos_lru_deleter_t deleter = deleteTableCacheLastrow;
+    LRUStatus status = taosLRUCacheInsert(pCache, key, keyLen, cacheRow, TD_ROW_LEN(cacheRow),
+					  deleter, NULL, TAOS_LRU_PRIORITY_LOW);
+    if (status != TAOS_LRU_STATUS_OK) {
+      code = -1;
+    }
+  }
+
+  return code;
+}
+
+int32_t tsdbCacheGetLastrow(SLRUCache *pCache, tb_uid_t uid, STSRow **ppRow) {
+  int32_t code = 0;
+  char key[32] = {0};
+  int keyLen = 0;
+
+  getTableCacheKey(uid, "lr", key, &keyLen);
+  LRUHandle *h = taosLRUCacheLookup(pCache, key, keyLen);
+  if (h) {
+    *ppRow = (STSRow *) taosLRUCacheValue(pCache, h);
+  } else {
+    // TODO: load lastrow from mem, imem, and files
+    // if table's empty, return code of -1
+    code = -1;
+  }
+
+  return code;
+}
+
+int32_t tsdbCacheDeleteLastrow(SLRUCache *pCache, tb_uid_t uid) {
+  int32_t code = 0;
+  char key[32] = {0};
+  int keyLen = 0;
+
+  getTableCacheKey(uid, "lr", key, &keyLen);
+  LRUHandle *h = taosLRUCacheLookup(pCache, key, keyLen);
+  if (h) {
+    taosLRUCacheRelease(pCache, h, true);
+    //void taosLRUCacheErase(SLRUCache * cache, const void *key, size_t keyLen);
+  }
+
+  return code;
+}

source/dnode/vnode/src/tsdb/tsdbMemTable.c

@@ -143,6 +143,7 @@ int32_t tsdbDeleteTableData(STsdb *pTsdb, int64_t version, tb_uid_t suid, tb_uid
   SMemTable *pMemTable = pTsdb->mem;
   STbData   *pTbData = NULL;
   SVBufPool *pPool = pTsdb->pVnode->inUse;
+  TSDBKEY    lastKey = {.version = version, .ts = eKey};
 
   // check if table exists (todo)
 
@@ -173,6 +174,10 @@ int32_t tsdbDeleteTableData(STsdb *pTsdb, int64_t version, tb_uid_t suid, tb_uid
 
   pMemTable->nDel++;
 
+  if (tsdbKeyCmprFn(&lastKey, &pTbData->info.maxKey) >= 0) {
+    tsdbCacheDeleteLastrow(pTsdb->lruCache, pTbData->uid);
+  }
+
   tsdbError("vgId:%d, delete data from table suid:%" PRId64 " uid:%" PRId64 " skey:%" PRId64 " eKey:%" PRId64
             " since %s",
             TD_VID(pTsdb->pVnode), suid, uid, sKey, eKey, tstrerror(code));
@@ -496,6 +501,7 @@ static int32_t tsdbInsertTableDataImpl(SMemTable *pMemTable, STbData *pTbData, i
   SMemSkipListNode *pos[SL_MAX_LEVEL];
   TSDBROW           row = tsdbRowFromTSRow(version, NULL);
   int32_t           nRow = 0;
+  STSRow           *pLastRow = NULL;
 
   tInitSubmitBlkIter(pMsgIter, pBlock, &blkIter);
 
@@ -517,6 +523,8 @@ static int32_t tsdbInsertTableDataImpl(SMemTable *pMemTable, STbData *pTbData, i
     pMemTable->info.minKey = key;
   }
 
+  pLastRow = row.pTSRow;
+
   // forward put rest data
   row.pTSRow = tGetSubmitBlkNext(&blkIter);
   if (row.pTSRow) {
@@ -532,12 +540,18 @@ static int32_t tsdbInsertTableDataImpl(SMemTable *pMemTable, STbData *pTbData, i
         goto _err;
       }
 
+      pLastRow = row.pTSRow;
+
       row.pTSRow = tGetSubmitBlkNext(&blkIter);
     } while (row.pTSRow);
   }
 
   if (tsdbKeyCmprFn(&key, &pTbData->info.maxKey) > 0) {
     pTbData->info.maxKey = key;
+
+    if (pLastRow) {
+      tsdbCacheInsertLastrow(pMemTable->pTsdb->lruCache, pTbData->uid, pLastRow);
+    }
   }
 
   if (tsdbKeyCmprFn(&key, &pMemTable->info.maxKey) > 0) {

source/dnode/vnode/src/tsdb/tsdbOpen.c

@@ -73,6 +73,10 @@ int tsdbOpen(SVnode *pVnode, STsdb **ppTsdb, const char *dir, STsdbKeepCfg *pKee
     goto _err;
   }
 
+  if (tsdbOpenCache(pTsdb) < 0) {
+    goto _err;
+  }
+
   tsdbDebug("vgId:%d, tsdb is opened for %s, days:%d, keep:%d,%d,%d", TD_VID(pVnode), pTsdb->path, pTsdb->keepCfg.days,
             pTsdb->keepCfg.keep0, pTsdb->keepCfg.keep1, pTsdb->keepCfg.keep2);
 
@@ -91,6 +95,7 @@ int tsdbClose(STsdb **pTsdb) {
     tsdbFSClose((*pTsdb)->fs);
     // tsdbFreeFS((*pTsdb)->fs);
     taosMemoryFreeClear(*pTsdb);
+    tsdbCloseCache((*pTsdb)->lruCache);
   }
   return 0;
 }