Merge branch '3.0' of https://github.com/taosdata/TDengine into feat/stream_compression

cmake/taosws_CMakeLists.txt.in

@@ -2,7 +2,7 @@
 # taosws-rs
 ExternalProject_Add(taosws-rs
         GIT_REPOSITORY https://github.com/taosdata/taos-connector-rust.git
-        GIT_TAG e771403
+        GIT_TAG 76bc64d
         SOURCE_DIR "${TD_SOURCE_DIR}/tools/taosws-rs"
         BINARY_DIR ""
         #BUILD_IN_SOURCE TRUE

docs/examples/csharp/.gitignore

 bin
 obj
 .vs
-*.sln
\ No newline at end of file
+*.sln
+wsConnect/obj
+wsInsert/obj
+wsQuery/obj
+wsStmt/obj
+wsConnect/bin
+wsInsert/bin
+wsQuery/bin
+wsStmt/bin
\ No newline at end of file

docs/examples/csharp/wsConnect/Program.cs

+using System;
+using TDengineWS.Impl;
+
+namespace Examples
+{
+    public class WSConnExample
+    {
+        static void Main(string[] args)
+        {
+            string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
+            IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
+            if (wsConn == IntPtr.Zero)
+            {
+                throw new Exception($"get WS connection failed,reason:{LibTaosWS.WSErrorStr(IntPtr.Zero)} code:{LibTaosWS.WSErrorNo(IntPtr.Zero)}");
+            }
+            else
+            {
+                Console.WriteLine("Establish connect success.");
+            }
+
+            // close connection.
+            LibTaosWS.WSClose(wsConn);
+        }
+    }
+}
\ No newline at end of file

docs/examples/csharp/wsConnect/wsConnect.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TDengine.Connector" Version="3.0.1" />
+  </ItemGroup>
+
+</Project>

docs/examples/csharp/wsInsert/Program.cs

+using System;
+using TDengineWS.Impl;
+
+namespace Examples
+{
+    public class WSInsertExample
+    {
+        static void Main(string[] args)
+        {
+            string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
+            IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
+
+            // Assert if connection is validate
+            if (wsConn == IntPtr.Zero)
+            {
+                throw new Exception($"get WS connection failed,reason:{LibTaosWS.WSErrorStr(IntPtr.Zero)} code:{LibTaosWS.WSErrorNo(IntPtr.Zero)}");
+            }
+            else
+            {
+                Console.WriteLine("Establish connect success.");
+            }
+
+            string createTable = "CREATE STABLE test.meters (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int);";
+            string insert = "INSERT INTO test.d1001 USING test.meters TAGS('California.SanFrancisco', 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)" +
+                            "test.d1002 USING test.meters TAGS('California.SanFrancisco', 3) VALUES('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)" +
+                            "test.d1003 USING test.meters TAGS('California.LosAngeles', 2) VALUES('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000)('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000) " +
+                            "test.d1004 USING test.meters TAGS('California.LosAngeles', 3) VALUES('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000)('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)";
+
+            IntPtr wsRes = LibTaosWS.WSQuery(wsConn, createTable);
+            ValidInsert("create table", wsRes);
+            LibTaosWS.WSFreeResult(wsRes);
+
+            wsRes = LibTaosWS.WSQuery(wsConn, insert);
+            ValidInsert("insert data", wsRes);
+            LibTaosWS.WSFreeResult(wsRes);
+
+            // close connection.
+            LibTaosWS.WSClose(wsConn);
+        }
+
+        static void ValidInsert(string desc, IntPtr wsRes)
+        {
+            int code = LibTaosWS.WSErrorNo(wsRes);
+            if (code != 0)
+            {
+                throw new Exception($"execute SQL failed: reason: {LibTaosWS.WSErrorStr(wsRes)}, code:{code}");
+            }
+            else
+            {
+                Console.WriteLine("{0} success affect {2} rows, cost {1} nanoseconds", desc, LibTaosWS.WSTakeTiming(wsRes),LibTaosWS.WSAffectRows(wsRes));
+            }
+        }
+    }
+
+}
+// Establish connect success.
+// create table success affect 0 rows, cost 3717542 nanoseconds
+// insert data success affect 8 rows, cost 2613637 nanoseconds
\ No newline at end of file

docs/examples/csharp/wsInsert/wsInsert.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TDengine.Connector" Version="3.0.1" />
+  </ItemGroup>
+
+</Project>

docs/examples/csharp/wsQuery/Program.cs

+using System;
+using TDengineWS.Impl;
+using System.Collections.Generic;
+using TDengineDriver;
+
+namespace Examples
+{
+    public class WSQueryExample
+    {
+        static void Main(string[] args)
+        {
+            string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
+            IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
+            if (wsConn == IntPtr.Zero)
+            {
+                throw new Exception($"get WS connection failed,reason:{LibTaosWS.WSErrorStr(IntPtr.Zero)} code:{LibTaosWS.WSErrorNo(IntPtr.Zero)}");
+            }
+            else
+            {
+                Console.WriteLine("Establish connect success.");
+            }
+
+            string select = "select * from test.meters";
+
+            // optional:wsRes = LibTaosWS.WSQuery(wsConn, select);
+            IntPtr wsRes = LibTaosWS.WSQueryTimeout(wsConn, select, 1);
+            // Assert if query execute success.
+            int code = LibTaosWS.WSErrorNo(wsRes);
+            if (code != 0)
+            {
+                throw new Exception($"execute SQL failed: reason: {LibTaosWS.WSErrorStr(wsRes)}, code:{code}");
+            }
+
+            // get meta data
+            List<TDengineMeta> metas = LibTaosWS.WSGetFields(wsRes);
+            // get retrieved data
+            List<object> dataSet = LibTaosWS.WSGetData(wsRes);
+
+            // do something with result.
+            foreach (var meta in metas)
+            {
+                Console.Write("{0} {1}({2}) \t|\t", meta.name, meta.TypeName(), meta.size);
+            }
+            Console.WriteLine("");
+
+            for (int i = 0; i < dataSet.Count;)
+            {
+                for (int j = 0; j < metas.Count; j++)
+                {
+                    Console.Write("{0}\t|\t", dataSet[i]);
+                    i++;
+                }
+                Console.WriteLine("");
+            }
+
+            // Free result after use.
+            LibTaosWS.WSFreeResult(wsRes);
+            
+            // close connection.
+            LibTaosWS.WSClose(wsConn);
+        }
+    }
+}
+
+// Establish connect success.
+// ts TIMESTAMP(8)         |       current FLOAT(4)        |       voltage INT(4)  |       phase FLOAT(4)  |       location BINARY(64)     |       groupid INT(4)  |
+// 1538548685000   |       10.8    |       223     |       0.29    |       California.LosAngeles   |       3       |
+// 1538548686500   |       11.5    |       221     |       0.35    |       California.LosAngeles   |       3       |
+// 1538548685500   |       11.8    |       221     |       0.28    |       California.LosAngeles   |       2       |
+// 1538548696600   |       13.4    |       223     |       0.29    |       California.LosAngeles   |       2       |
+// 1538548685000   |       10.3    |       219     |       0.31    |       California.SanFrancisco |       2       |
+// 1538548695000   |       12.6    |       218     |       0.33    |       California.SanFrancisco |       2       |
+// 1538548696800   |       12.3    |       221     |       0.31    |       California.SanFrancisco |       2       |
+// 1538548696650   |       10.3    |       218     |       0.25    |       California.SanFrancisco |       3       |
\ No newline at end of file

docs/examples/csharp/wsQuery/wsQuery.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TDengine.Connector" Version="3.0.1" />
+  </ItemGroup>
+
+</Project>

docs/examples/csharp/wsStmt/Program.cs

+using System;
+using TDengineWS.Impl;
+using TDengineDriver;
+using System.Runtime.InteropServices;
+
+namespace Examples
+{
+    public class WSStmtExample
+    {
+        static void Main(string[] args)
+        {
+            const string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
+            const string table = "meters";
+            const string database = "test";
+            const string childTable = "d1005";
+            string insert = $"insert into ? using {database}.{table} tags(?,?) values(?,?,?,?)";
+            const int numOfTags = 2;
+            const int numOfColumns = 4;
+
+            // Establish connection
+            IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
+            if (wsConn == IntPtr.Zero)
+            {
+                throw new Exception($"get WS connection failed,reason:{LibTaosWS.WSErrorStr(IntPtr.Zero)} code:{LibTaosWS.WSErrorNo(IntPtr.Zero)}");
+            }
+            else
+            {
+                Console.WriteLine("Establish connect success...");
+            }
+
+            // init stmt
+            IntPtr wsStmt = LibTaosWS.WSStmtInit(wsConn);
+            if (wsStmt != IntPtr.Zero)
+            {
+                int code = LibTaosWS.WSStmtPrepare(wsStmt, insert);
+                ValidStmtStep(code, wsStmt, "WSStmtPrepare");
+
+                TAOS_MULTI_BIND[] wsTags = new TAOS_MULTI_BIND[] { WSMultiBind.WSBindNchar(new string[] { "California.SanDiego" }), WSMultiBind.WSBindInt(new int?[] { 4 }) };
+                code = LibTaosWS.WSStmtSetTbnameTags(wsStmt, $"{database}.{childTable}", wsTags, numOfTags);
+                ValidStmtStep(code, wsStmt, "WSStmtSetTbnameTags");
+
+                TAOS_MULTI_BIND[] data = new TAOS_MULTI_BIND[4];
+                data[0] = WSMultiBind.WSBindTimestamp(new long[] { 1538548687000, 1538548688000, 1538548689000, 1538548690000, 1538548691000 });
+                data[1] = WSMultiBind.WSBindFloat(new float?[] { 10.30F, 10.40F, 10.50F, 10.60F, 10.70F });
+                data[2] = WSMultiBind.WSBindInt(new int?[] { 223, 221, 222, 220, 219 });
+                data[3] = WSMultiBind.WSBindFloat(new float?[] { 0.31F, 0.32F, 0.33F, 0.35F, 0.28F });
+                code = LibTaosWS.WSStmtBindParamBatch(wsStmt, data, numOfColumns);
+                ValidStmtStep(code, wsStmt, "WSStmtBindParamBatch");
+
+                code = LibTaosWS.WSStmtAddBatch(wsStmt);
+                ValidStmtStep(code, wsStmt, "WSStmtAddBatch");
+
+                IntPtr stmtAffectRowPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Int32)));
+                code = LibTaosWS.WSStmtExecute(wsStmt, stmtAffectRowPtr);
+                ValidStmtStep(code, wsStmt, "WSStmtExecute");
+                Console.WriteLine("WS STMT insert {0} rows...", Marshal.ReadInt32(stmtAffectRowPtr));
+                Marshal.FreeHGlobal(stmtAffectRowPtr);
+
+                LibTaosWS.WSStmtClose(wsStmt);
+
+                // Free unmanaged memory
+                WSMultiBind.WSFreeTaosBind(wsTags);
+                WSMultiBind.WSFreeTaosBind(data);
+
+                //check result with SQL "SELECT * FROM test.d1005;"
+            }
+            else
+            {
+                throw new Exception("Init STMT failed...");
+            }
+
+            // close connection.
+            LibTaosWS.WSClose(wsConn);
+        }
+
+        static void ValidStmtStep(int code, IntPtr wsStmt, string desc)
+        {
+            if (code != 0)
+            {
+                throw new Exception($"{desc} failed,reason: {LibTaosWS.WSErrorStr(wsStmt)}, code: {code}");
+            }
+            else
+            {
+                Console.WriteLine("{0} success...", desc);
+            }
+        }
+    }
+}
+
+// WSStmtPrepare success...
+// WSStmtSetTbnameTags success...
+// WSStmtBindParamBatch success...
+// WSStmtAddBatch success...
+// WSStmtExecute success...
+// WS STMT insert 5 rows...
\ No newline at end of file

docs/examples/csharp/wsStmt/wsStmt.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TDengine.Connector" Version="3.0.1" />
+  </ItemGroup>
+
+</Project>

docs/zh/07-develop/01-connect/_connect_cs.mdx

@@ -2,7 +2,7 @@
 {{#include docs/examples/csharp/ConnectExample.cs}}
 ```
 
-:::info
-C# 连接器目前只支持原生连接。
+```csharp title="WebSocket 连接"
+{{#include docs/examples/csharp/wsConnect/Program.cs}}
+```
 
-:::

docs/zh/08-connector/40-csharp.mdx

@@ -17,7 +17,7 @@ import CSAsyncQuery from "../07-develop/04-query-data/_cs_async.mdx"
 
 `TDengine.Connector` 是 TDengine 提供的 C# 语言连接器。C# 开发人员可以通过它开发存取 TDengine 集群数据的 C# 应用软件。
 
-`TDengine.Connector` 连接器支持通过 TDengine 客户端驱动（taosc）建立与 TDengine 运行实例的连接，提供数据写入、查询、订阅、schemaless 数据写入、参数绑定接口数据写入等功能 `TDengine.Connector` 目前暂未提供 REST 连接方式，用户可以参考 [REST API](../rest-api/) 文档自行编写。
+`TDengine.Connector` 连接器支持通过 TDengine 客户端驱动（taosc）建立与 TDengine 运行实例的连接，提供数据写入、查询、数据订阅、schemaless 数据写入、参数绑定接口数据写入等功能。 `TDengine.Connector` 还支持 WebSocket，通过 DSN 建立 WebSocket 连接，提供数据写入、查询、参数绑定接口数据写入等功能。
 
 本文介绍如何在 Linux 或 Windows 环境中安装 `TDengine.Connector`，并通过 `TDengine.Connector` 连接 TDengine 集群，进行数据写入、查询等基本操作。
 
@@ -35,12 +35,29 @@ import CSAsyncQuery from "../07-develop/04-query-data/_cs_async.mdx"
 
 ## 支持的功能特性
 
+<Tabs defaultValue="native">
+
+<TabItem value="native" label="原生连接">
+
 1. 连接管理
 2. 普通查询
 3. 连续查询
 4. 参数绑定
-5. 订阅功能
+5. 数据订阅（TMQ）
 6. Schemaless
+ 
+</TabItem>
+
+<TabItem value="rest" label="WebSocket 连接">
+
+1. 连接管理
+2. 普通查询
+3. 连续查询
+4. 参数绑定
+
+</TabItem>
+
+</Tabs>
 
 ## 安装步骤
 
@@ -79,7 +96,13 @@ dotnet add exmaple.csproj reference src/TDengine.csproj
 
 ## 建立连接
 
-``` C#
+<Tabs defaultValue="native">
+
+<TabItem value="native" label="原生连接">
+
+使用 host、username、password、port 等信息建立连接。
+
+``` csharp
 using TDengineDriver;
 
 namespace TDengineExample
@@ -109,17 +132,63 @@ namespace TDengineExample
         }
     }
 }
+```
 
+</TabItem>
+
+<TabItem value="rest" label="WebSocket 连接">
+
+使用 DSN 建立 WebSocket 连接 DSN 连接。 描述字符串基本结构如下：
+
+```text
+[<protocol>]://[[<username>:<password>@]<host>:<port>][/<database>][?<p1>=<v1>[&<p2>=<v2>]]
+|------------|---|-----------|-----------|------|------|------------|-----------------------|
+|   protocol |   | username  | password  | host | port |  database  |  params               |
+```
+
+各部分意义见下表：
+
+* **protocol**: 显示指定以何种方式建立连接，例如：`ws://localhost:6041` 指定以 Websocket 方式建立连接(支持http/ws)。
+  
+* **username/password**: 用于创建连接的用户名及密码（默认`root/taosdata`）。
+  
+* **host/port**: 指定创建连接的服务器及端口，WebSocket 连接默认为 `localhost:6041` 。
+  
+* **database**: 指定默认连接的数据库名。
+
+* **params**：其他可选参数。
+
+``` csharp
+{{#include docs/examples/csharp/wsConnect/Program.cs}}
 ```
 
+</TabItem>
+</Tabs>
+
 ## 使用示例
 
 ### 写入数据
 
 #### SQL 写入
 
+<Tabs defaultValue="native">
+
+<TabItem value="native" label="原生连接">
+
 <CSInsert />
 
+</TabItem>
+
+<TabItem value="rest" label="WebSocket 连接">
+
+```csharp
+{{#include docs/examples/csharp/wsInsert/Program.cs}}
+```
+
+</TabItem>
+
+</Tabs>
+
 #### InfluxDB 行协议写入
 
 <CSInfluxLine />
@@ -132,12 +201,50 @@ namespace TDengineExample
 
 <CSOpenTSDBJson />
 
+#### 参数绑定
+
+<Tabs defaultValue="native">
+
+<TabItem value="native" label="原生连接">
+
+``` csharp
+{{#include docs/examples/csharp/StmtInsertExample.cs}}
+```
+
+</TabItem>
+
+<TabItem value="rest" label="WebSocket 连接">
+
+```csharp
+{{#include docs/examples/csharp/wsStmt/Program.cs}}
+```
+
+</TabItem>
+
+</Tabs>
+
 ### 查询数据
 
 #### 同步查询
 
+<Tabs defaultValue="native">
+
+<TabItem value="native" label="原生连接">
+
 <CSQuery />
 
+</TabItem>
+
+<TabItem value="rest" label="WebSocket 连接">
+
+```csharp
+{{#include docs/examples/csharp/wsQuery/Program.cs}}
+```
+
+</TabItem>
+
+</Tabs>
+
 #### 异步查询
 
 <CSAsyncQuery />
@@ -151,12 +258,15 @@ namespace TDengineExample
 | [stmt](https://github.com/taosdata/taos-connector-dotnet/tree/3.0/examples/Stmt)                                   | 使用 TDengine.Connector 实现的参数绑定插入和查询的示例 |
 | [schemaless](https://github.com/taosdata/taos-connector-dotnet/blob/3.0/examples/schemaless)                       | 使用 TDengine.Connector 实现的使用 schemaless 写入的示例 |
 | [async query](https://github.com/taosdata/taos-connector-dotnet/blob/3.0/examples/AsyncQuery/QueryAsync.cs) | 使用 TDengine.Connector 实现的异步查询的示例 |
-| [TMQ](https://github.com/taosdata/taos-connector-dotnet/blob/3.0/examples/TMQ/TMQ.cs)      | 使用 TDengine.Connector 实现的订阅数据的示例 |
+| [数据订阅（TMQ）](https://github.com/taosdata/taos-connector-dotnet/blob/3.0/examples/TMQ/TMQ.cs)      | 使用 TDengine.Connector 实现的订阅数据的示例 |
+| [Basic WebSocket Usage](https://github.com/taosdata/taos-connector-dotnet/blob/5a4a7cd0dbcda114447cdc6d0c6dedd8e84a52da/examples/WS/WebSocketSample.cs)      | 使用 TDengine.Connector 的 WebSocket 基本的示例 |
+| [Basic WebSocket STMT](https://github.com/taosdata/taos-connector-dotnet/blob/5a4a7cd0dbcda114447cdc6d0c6dedd8e84a52da/examples/WS/WebSocketSTMT.cs)      | 使用 TDengine.Connector 的 WebSocket STMT 基本的示例 |
 
 ## 重要更新记录
 
 | TDengine.Connector | 说明                           |
 |--------------------|--------------------------------|
+|        3.0.1       | 支持 WebSocket 和 Cloud，查询，插入，参数绑定。 |
 |        3.0.0       | 支持 TDengine 3.0.0.0，不兼容 2.x。新增接口TDengine.Impl.GetData()，解析查询结果。 |
 |        1.0.7       | 修复 TDengine.Query()内存泄露。 |
 |        1.0.6       | 修复 schemaless 在 1.0.4 和 1.0.5 中失效 bug。 |

docs/zh/12-taos-sql/10-function.md

@@ -1233,7 +1233,7 @@ SELECT SERVER_VERSION();
 ### SERVER_STATUS
 
 ```sql
-SELECT SERVER_VERSION();
+SELECT SERVER_STATUS();
 ```
 
 **说明**：返回服务端当前的状态。

include/libs/sync/sync.h

@@ -22,6 +22,7 @@ extern "C" {
 
 #include "cJSON.h"
 #include "tdef.h"
+#include "tlrucache.h"
 #include "tmsgcb.h"
 
 extern bool gRaftDetailLog;
@@ -153,7 +154,8 @@ typedef struct SSyncFSM {
 // abstract definition of log store in raft
 // SWal implements it
 typedef struct SSyncLogStore {
-  void* data;
+  SLRUCache* pCache;
+  void*      data;
 
   // append one log entry
   int32_t (*appendEntry)(struct SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry);

source/dnode/vnode/src/meta/metaTable.c

@@ -362,8 +362,9 @@ int metaAlterSTable(SMeta *pMeta, int64_t version, SVCreateStbReq *pReq) {
   // update uid index
   metaUpdateUidIdx(pMeta, &nStbEntry);
 
-  if (oStbEntry.pBuf) taosMemoryFree(oStbEntry.pBuf);
   metaULock(pMeta);
+
+  if (oStbEntry.pBuf) taosMemoryFree(oStbEntry.pBuf);
   tDecoderClear(&dc);
   tdbTbcClose(pTbDbc);
   tdbTbcClose(pUidIdxc);
@@ -922,6 +923,8 @@ static int metaUpdateTableTagVal(SMeta *pMeta, int64_t version, SVAlterTbReq *pA
     taosArrayDestroy(pTagArray);
   }
 
+  metaWLock(pMeta);
+
   // save to table.db
   metaSaveToTbDb(pMeta, &ctbEntry);
 
@@ -936,6 +939,8 @@ static int metaUpdateTableTagVal(SMeta *pMeta, int64_t version, SVAlterTbReq *pA
   tdbTbUpsert(pMeta->pCtbIdx, &ctbIdxKey, sizeof(ctbIdxKey), ctbEntry.ctbEntry.pTags,
               ((STag *)(ctbEntry.ctbEntry.pTags))->len, &pMeta->txn);
 
+  metaULock(pMeta);
+
   tDecoderClear(&dc1);
   tDecoderClear(&dc2);
   if (ctbEntry.ctbEntry.pTags) taosMemoryFree((void *)ctbEntry.ctbEntry.pTags);

source/libs/sync/src/syncCommit.c

@@ -69,15 +69,26 @@ void syncMaybeAdvanceCommitIndex(SSyncNode* pSyncNode) {
 
     if (agree) {
       // term
-      SSyncRaftEntry* pEntry = pSyncNode->pLogStore->getEntry(pSyncNode->pLogStore, index);
-      ASSERT(pEntry != NULL);
-
+      SSyncRaftEntry* pEntry = NULL;
+      SLRUCache*      pCache = pSyncNode->pLogStore->pCache;
+      LRUHandle*      h = taosLRUCacheLookup(pCache, &index, sizeof(index));
+      if (h) {
+        pEntry = (SSyncRaftEntry*)taosLRUCacheValue(pCache, h);
+      } else {
+        pEntry = pSyncNode->pLogStore->getEntry(pSyncNode->pLogStore, index);
+        ASSERT(pEntry != NULL);
+      }
       // cannot commit, even if quorum agree. need check term!
       if (pEntry->term <= pSyncNode->pRaftStore->currentTerm) {
         // update commit index
         newCommitIndex = index;
 
-        syncEntryDestory(pEntry);
+        if (h) {
+          taosLRUCacheRelease(pCache, h, false);
+        } else {
+          syncEntryDestory(pEntry);
+        }
+
         break;
       } else {
         do {
@@ -88,7 +99,11 @@ void syncMaybeAdvanceCommitIndex(SSyncNode* pSyncNode) {
         } while (0);
       }
 
-      syncEntryDestory(pEntry);
+      if (h) {
+        taosLRUCacheRelease(pCache, h, false);
+      } else {
+        syncEntryDestory(pEntry);
+      }
     }
   }
 

source/libs/sync/src/syncMain.c

@@ -2581,6 +2581,20 @@ static int32_t syncNodeEqNoop(SSyncNode* ths) {
   return ret;
 }
 
+static void deleteCacheEntry(const void* key, size_t keyLen, void* value) { taosMemoryFree(value); }
+
+static int32_t syncCacheEntry(SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry, LRUHandle** h) {
+  int       code = 0;
+  int       entryLen = sizeof(*pEntry) + pEntry->dataLen;
+  LRUStatus status = taosLRUCacheInsert(pLogStore->pCache, &pEntry->index, sizeof(pEntry->index), pEntry, entryLen,
+                                        deleteCacheEntry, h, TAOS_LRU_PRIORITY_LOW);
+  if (status != TAOS_LRU_STATUS_OK) {
+    code = -1;
+  }
+
+  return code;
+}
+
 static int32_t syncNodeAppendNoop(SSyncNode* ths) {
   int32_t ret = 0;
 
@@ -2589,13 +2603,21 @@ static int32_t syncNodeAppendNoop(SSyncNode* ths) {
   SSyncRaftEntry* pEntry = syncEntryBuildNoop(term, index, ths->vgId);
   ASSERT(pEntry != NULL);
 
+  LRUHandle* h = NULL;
+  syncCacheEntry(ths->pLogStore, pEntry, &h);
+
   if (ths->state == TAOS_SYNC_STATE_LEADER) {
     int32_t code = ths->pLogStore->syncLogAppendEntry(ths->pLogStore, pEntry);
     ASSERT(code == 0);
     syncNodeReplicate(ths, false);
   }
 
-  syncEntryDestory(pEntry);
+  if (h) {
+    taosLRUCacheRelease(ths->pLogStore->pCache, h, false);
+  } else {
+    syncEntryDestory(pEntry);
+  }
+
   return ret;
 }
 
@@ -2654,6 +2676,9 @@ int32_t syncNodeOnClientRequestCb(SSyncNode* ths, SyncClientRequest* pMsg, SyncI
   SSyncRaftEntry* pEntry = syncEntryBuild2((SyncClientRequest*)pMsg, term, index);
   ASSERT(pEntry != NULL);
 
+  LRUHandle* h = NULL;
+  syncCacheEntry(ths->pLogStore, pEntry, &h);
+
   if (ths->state == TAOS_SYNC_STATE_LEADER) {
     // append entry
     code = ths->pLogStore->syncLogAppendEntry(ths->pLogStore, pEntry);
@@ -2685,7 +2710,12 @@ int32_t syncNodeOnClientRequestCb(SSyncNode* ths, SyncClientRequest* pMsg, SyncI
     }
   }
 
-  syncEntryDestory(pEntry);
+  if (h) {
+    taosLRUCacheRelease(ths->pLogStore->pCache, h, false);
+  } else {
+    syncEntryDestory(pEntry);
+  }
+
   return ret;
 }
 
@@ -2973,9 +3003,15 @@ int32_t syncNodeCommit(SSyncNode* ths, SyncIndex beginIndex, SyncIndex endIndex,
     for (SyncIndex i = beginIndex; i <= endIndex; ++i) {
       if (i != SYNC_INDEX_INVALID) {
         SSyncRaftEntry* pEntry;
-        code = ths->pLogStore->syncLogGetEntry(ths->pLogStore, i, &pEntry);
-        ASSERT(code == 0);
-        ASSERT(pEntry != NULL);
+        SLRUCache*      pCache = ths->pLogStore->pCache;
+        LRUHandle*      h = taosLRUCacheLookup(pCache, &i, sizeof(i));
+        if (h) {
+          pEntry = (SSyncRaftEntry*)taosLRUCacheValue(pCache, h);
+        } else {
+          code = ths->pLogStore->syncLogGetEntry(ths->pLogStore, i, &pEntry);
+          ASSERT(code == 0);
+          ASSERT(pEntry != NULL);
+        }
 
         SRpcMsg rpcMsg;
         syncEntry2OriginalRpc(pEntry, &rpcMsg);
@@ -3058,7 +3094,11 @@ int32_t syncNodeCommit(SSyncNode* ths, SyncIndex beginIndex, SyncIndex endIndex,
         }
 
         rpcFreeCont(rpcMsg.pCont);
-        syncEntryDestory(pEntry);
+        if (h) {
+          taosLRUCacheRelease(pCache, h, false);
+        } else {
+          syncEntryDestory(pEntry);
+        }
       }
     }
   }

source/libs/sync/src/syncRaftLog.c

@@ -53,6 +53,15 @@ SSyncLogStore* logStoreCreate(SSyncNode* pSyncNode) {
   SSyncLogStore* pLogStore = taosMemoryMalloc(sizeof(SSyncLogStore));
   ASSERT(pLogStore != NULL);
 
+  pLogStore->pCache = taosLRUCacheInit(10 * 1024 * 1024, 1, .5);
+  if (pLogStore->pCache == NULL) {
+    terrno = TSDB_CODE_WAL_OUT_OF_MEMORY;
+    taosMemoryFree(pLogStore);
+    return NULL;
+  }
+
+  taosLRUCacheSetStrictCapacity(pLogStore->pCache, false);
+
   pLogStore->data = taosMemoryMalloc(sizeof(SSyncLogStoreData));
   ASSERT(pLogStore->data != NULL);
 
@@ -102,6 +111,10 @@ void logStoreDestory(SSyncLogStore* pLogStore) {
     taosThreadMutexDestroy(&(pData->mutex));
 
     taosMemoryFree(pLogStore->data);
+
+    taosLRUCacheEraseUnrefEntries(pLogStore->pCache);
+    taosLRUCacheCleanup(pLogStore->pCache);
+
     taosMemoryFree(pLogStore);
   }
 }
@@ -243,7 +256,7 @@ static int32_t raftLogAppendEntry(struct SSyncLogStore* pLogStore, SSyncRaftEntr
 static int32_t raftLogGetEntry(struct SSyncLogStore* pLogStore, SyncIndex index, SSyncRaftEntry** ppEntry) {
   SSyncLogStoreData* pData = pLogStore->data;
   SWal*              pWal = pData->pWal;
-  int32_t            code;
+  int32_t            code = 0;
 
   *ppEntry = NULL;
 
@@ -257,6 +270,7 @@ static int32_t raftLogGetEntry(struct SSyncLogStore* pLogStore, SyncIndex index,
   taosThreadMutexLock(&(pData->mutex));
 
   code = walReadVer(pWalHandle, index);
+  // code = walReadVerCached(pWalHandle, index);
   if (code != 0) {
     int32_t     err = terrno;
     const char* errStr = tstrerror(err);
@@ -412,6 +426,7 @@ SSyncRaftEntry* logStoreGetEntry(SSyncLogStore* pLogStore, SyncIndex index) {
     ASSERT(pWalHandle != NULL);
 
     int32_t code = walReadVer(pWalHandle, index);
+    // int32_t code = walReadVerCached(pWalHandle, index);
     if (code != 0) {
       int32_t     err = terrno;
       const char* errStr = tstrerror(err);

source/util/src/tpagedbuf.c

@@ -284,7 +284,6 @@ static char* evacOneDataPage(SDiskbasedBuf* pBuf) {
 
   // all pages are referenced by user, try to allocate new space
   if (pn == NULL) {
-    assert(0);
     int32_t prev = pBuf->inMemPages;
 
     // increase by 50% of previous mem pages
@@ -304,7 +303,6 @@ static char* evacOneDataPage(SDiskbasedBuf* pBuf) {
     bufPage = flushPageToDisk(pBuf, d);
   }
 
-  ASSERT((bufPage != NULL) || terrno != TSDB_CODE_SUCCESS);
   return bufPage;
 }
 
@@ -377,12 +375,6 @@ void* getNewBufPage(SDiskbasedBuf* pBuf, int32_t* pageId) {
   char* availablePage = NULL;
   if (NO_IN_MEM_AVAILABLE_PAGES(pBuf)) {
     availablePage = evacOneDataPage(pBuf);
-
-    // Failed to allocate a new buffer page, and there is an error occurs.
-    if (availablePage == NULL) {
-      assert(0);
-      return NULL;
-    }
   }
 
   SPageInfo* pi = NULL;
@@ -652,4 +644,4 @@ void clearDiskbasedBuf(SDiskbasedBuf* pBuf) {
   pBuf->totalBufSize = 0;
   pBuf->allocateId = -1;
   pBuf->fileSize = 0;
-}
\ No newline at end of file
+}

tests/docs-examples-test/csharp.sh

@@ -6,23 +6,24 @@ pgrep taosd || taosd >> /dev/null 2>&1 &
 pgrep taosadapter || taosadapter >> /dev/null 2>&1 &
 cd ../../docs/examples/csharp
 
-dotnet run --project connect.csproj
+#dotnet run --project connect.csproj
 
-taos -s "drop database if exists power"
-dotnet run --project sqlinsert.csproj
-dotnet run --project query.csproj
-dotnet run --project asyncquery.csproj
-dotnet run --project subscribe.csproj
+#taos -s "drop database if exists power"
+#dotnet run --project sqlinsert.csproj
+#dotnet run --project query.csproj
+#dotnet run --project asyncquery.csproj
+#dotnet run --project subscribe.csproj
 
-taos -s "drop topic if exists topic_example"
-taos -s "drop database if exists power"
-dotnet run --project stmtinsert.csproj
+#taos -s "drop topic if exists topic_example"
+#taos -s "drop database if exists power"
+#dotnet run --project stmtinsert.csproj
 
-taos -s "drop database if exists test"
-dotnet run --project influxdbline.csproj
+#taos -s "drop database if exists test"
+#dotnet run --project influxdbline.csproj
 
-taos -s "drop database if exists test"
-dotnet run --project optstelnet.csproj
+#taos -s "drop database if exists test"
+#dotnet run --project optstelnet.csproj
 
-taos -s "drop database if exists test"
-dotnet run --project optsjson.csproj
\ No newline at end of file
+#taos -s "drop database if exists test"
+#dotnet run --project optsjson.csproji
+echo "uncomment temporily"