feat: support show cluster alive; and show db.alive;

include/common/taosdef.h

@@ -30,6 +30,11 @@ typedef int64_t tb_uid_t;
 #define IS_TSWINDOW_SPECIFIED(win) (((win).skey != INT64_MIN) || ((win).ekey != INT64_MAX))
 #define TSWINDOW_IS_EQUAL(t1, t2)  (((t1).skey == (t2).skey) && ((t1).ekey == (t2).ekey))
 
+//define show cluster alive and show db.alive
+#define SHOW_STATUS_NOT_AVAILABLE  0
+#define SHOW_STATUS_AVAILABLE      1
+#define SHOW_STATUS_HALF_AVAILABLE 2
+
 typedef enum {
   TSDB_SUPER_TABLE = 1,   // super table
   TSDB_CHILD_TABLE = 2,   // table created from super table

include/common/ttokendef.h

@@ -175,171 +175,172 @@
 #define TK_CONSUMERS                      157
 #define TK_SUBSCRIPTIONS                  158
 #define TK_VNODES                         159
-#define TK_LIKE                           160
-#define TK_TBNAME                         161
-#define TK_QTAGS                          162
-#define TK_AS                             163
-#define TK_INDEX                          164
-#define TK_FUNCTION                       165
-#define TK_INTERVAL                       166
-#define TK_COUNT                          167
-#define TK_LAST_ROW                       168
-#define TK_TOPIC                          169
-#define TK_WITH                           170
-#define TK_META                           171
-#define TK_CONSUMER                       172
-#define TK_GROUP                          173
-#define TK_DESC                           174
-#define TK_DESCRIBE                       175
-#define TK_RESET                          176
-#define TK_QUERY                          177
-#define TK_CACHE                          178
-#define TK_EXPLAIN                        179
-#define TK_ANALYZE                        180
-#define TK_VERBOSE                        181
-#define TK_NK_BOOL                        182
-#define TK_RATIO                          183
-#define TK_NK_FLOAT                       184
-#define TK_OUTPUTTYPE                     185
-#define TK_AGGREGATE                      186
-#define TK_BUFSIZE                        187
-#define TK_STREAM                         188
-#define TK_INTO                           189
-#define TK_TRIGGER                        190
-#define TK_AT_ONCE                        191
-#define TK_WINDOW_CLOSE                   192
-#define TK_IGNORE                         193
-#define TK_EXPIRED                        194
-#define TK_FILL_HISTORY                   195
-#define TK_SUBTABLE                       196
-#define TK_KILL                           197
-#define TK_CONNECTION                     198
-#define TK_TRANSACTION                    199
-#define TK_BALANCE                        200
-#define TK_VGROUP                         201
-#define TK_MERGE                          202
-#define TK_REDISTRIBUTE                   203
-#define TK_SPLIT                          204
-#define TK_DELETE                         205
-#define TK_INSERT                         206
-#define TK_NULL                           207
-#define TK_NK_QUESTION                    208
-#define TK_NK_ARROW                       209
-#define TK_ROWTS                          210
-#define TK_QSTART                         211
-#define TK_QEND                           212
-#define TK_QDURATION                      213
-#define TK_WSTART                         214
-#define TK_WEND                           215
-#define TK_WDURATION                      216
-#define TK_IROWTS                         217
-#define TK_ISFILLED                       218
-#define TK_CAST                           219
-#define TK_NOW                            220
-#define TK_TODAY                          221
-#define TK_TIMEZONE                       222
-#define TK_CLIENT_VERSION                 223
-#define TK_SERVER_VERSION                 224
-#define TK_SERVER_STATUS                  225
-#define TK_CURRENT_USER                   226
-#define TK_CASE                           227
-#define TK_END                            228
-#define TK_WHEN                           229
-#define TK_THEN                           230
-#define TK_ELSE                           231
-#define TK_BETWEEN                        232
-#define TK_IS                             233
-#define TK_NK_LT                          234
-#define TK_NK_GT                          235
-#define TK_NK_LE                          236
-#define TK_NK_GE                          237
-#define TK_NK_NE                          238
-#define TK_MATCH                          239
-#define TK_NMATCH                         240
-#define TK_CONTAINS                       241
-#define TK_IN                             242
-#define TK_JOIN                           243
-#define TK_INNER                          244
-#define TK_SELECT                         245
-#define TK_DISTINCT                       246
-#define TK_WHERE                          247
-#define TK_PARTITION                      248
-#define TK_BY                             249
-#define TK_SESSION                        250
-#define TK_STATE_WINDOW                   251
-#define TK_EVENT_WINDOW                   252
-#define TK_START                          253
-#define TK_SLIDING                        254
-#define TK_FILL                           255
-#define TK_VALUE                          256
-#define TK_NONE                           257
-#define TK_PREV                           258
-#define TK_LINEAR                         259
-#define TK_NEXT                           260
-#define TK_HAVING                         261
-#define TK_RANGE                          262
-#define TK_EVERY                          263
-#define TK_ORDER                          264
-#define TK_SLIMIT                         265
-#define TK_SOFFSET                        266
-#define TK_LIMIT                          267
-#define TK_OFFSET                         268
-#define TK_ASC                            269
-#define TK_NULLS                          270
-#define TK_ABORT                          271
-#define TK_AFTER                          272
-#define TK_ATTACH                         273
-#define TK_BEFORE                         274
-#define TK_BEGIN                          275
-#define TK_BITAND                         276
-#define TK_BITNOT                         277
-#define TK_BITOR                          278
-#define TK_BLOCKS                         279
-#define TK_CHANGE                         280
-#define TK_COMMA                          281
-#define TK_COMPACT                        282
-#define TK_CONCAT                         283
-#define TK_CONFLICT                       284
-#define TK_COPY                           285
-#define TK_DEFERRED                       286
-#define TK_DELIMITERS                     287
-#define TK_DETACH                         288
-#define TK_DIVIDE                         289
-#define TK_DOT                            290
-#define TK_EACH                           291
-#define TK_FAIL                           292
-#define TK_FILE                           293
-#define TK_FOR                            294
-#define TK_GLOB                           295
-#define TK_ID                             296
-#define TK_IMMEDIATE                      297
-#define TK_IMPORT                         298
-#define TK_INITIALLY                      299
-#define TK_INSTEAD                        300
-#define TK_ISNULL                         301
-#define TK_KEY                            302
-#define TK_MODULES                        303
-#define TK_NK_BITNOT                      304
-#define TK_NK_SEMI                        305
-#define TK_NOTNULL                        306
-#define TK_OF                             307
-#define TK_PLUS                           308
-#define TK_PRIVILEGE                      309
-#define TK_RAISE                          310
-#define TK_REPLACE                        311
-#define TK_RESTRICT                       312
-#define TK_ROW                            313
-#define TK_SEMI                           314
-#define TK_STAR                           315
-#define TK_STATEMENT                      316
-#define TK_STRICT                         317
-#define TK_STRING                         318
-#define TK_TIMES                          319
-#define TK_UPDATE                         320
-#define TK_VALUES                         321
-#define TK_VARIABLE                       322
-#define TK_VIEW                           323
-#define TK_WAL                            324
+#define TK_ALIVE                          160
+#define TK_LIKE                           161
+#define TK_TBNAME                         162
+#define TK_QTAGS                          163
+#define TK_AS                             164
+#define TK_INDEX                          165
+#define TK_FUNCTION                       166
+#define TK_INTERVAL                       167
+#define TK_COUNT                          168
+#define TK_LAST_ROW                       169
+#define TK_TOPIC                          170
+#define TK_WITH                           171
+#define TK_META                           172
+#define TK_CONSUMER                       173
+#define TK_GROUP                          174
+#define TK_DESC                           175
+#define TK_DESCRIBE                       176
+#define TK_RESET                          177
+#define TK_QUERY                          178
+#define TK_CACHE                          179
+#define TK_EXPLAIN                        180
+#define TK_ANALYZE                        181
+#define TK_VERBOSE                        182
+#define TK_NK_BOOL                        183
+#define TK_RATIO                          184
+#define TK_NK_FLOAT                       185
+#define TK_OUTPUTTYPE                     186
+#define TK_AGGREGATE                      187
+#define TK_BUFSIZE                        188
+#define TK_STREAM                         189
+#define TK_INTO                           190
+#define TK_TRIGGER                        191
+#define TK_AT_ONCE                        192
+#define TK_WINDOW_CLOSE                   193
+#define TK_IGNORE                         194
+#define TK_EXPIRED                        195
+#define TK_FILL_HISTORY                   196
+#define TK_SUBTABLE                       197
+#define TK_KILL                           198
+#define TK_CONNECTION                     199
+#define TK_TRANSACTION                    200
+#define TK_BALANCE                        201
+#define TK_VGROUP                         202
+#define TK_MERGE                          203
+#define TK_REDISTRIBUTE                   204
+#define TK_SPLIT                          205
+#define TK_DELETE                         206
+#define TK_INSERT                         207
+#define TK_NULL                           208
+#define TK_NK_QUESTION                    209
+#define TK_NK_ARROW                       210
+#define TK_ROWTS                          211
+#define TK_QSTART                         212
+#define TK_QEND                           213
+#define TK_QDURATION                      214
+#define TK_WSTART                         215
+#define TK_WEND                           216
+#define TK_WDURATION                      217
+#define TK_IROWTS                         218
+#define TK_ISFILLED                       219
+#define TK_CAST                           220
+#define TK_NOW                            221
+#define TK_TODAY                          222
+#define TK_TIMEZONE                       223
+#define TK_CLIENT_VERSION                 224
+#define TK_SERVER_VERSION                 225
+#define TK_SERVER_STATUS                  226
+#define TK_CURRENT_USER                   227
+#define TK_CASE                           228
+#define TK_END                            229
+#define TK_WHEN                           230
+#define TK_THEN                           231
+#define TK_ELSE                           232
+#define TK_BETWEEN                        233
+#define TK_IS                             234
+#define TK_NK_LT                          235
+#define TK_NK_GT                          236
+#define TK_NK_LE                          237
+#define TK_NK_GE                          238
+#define TK_NK_NE                          239
+#define TK_MATCH                          240
+#define TK_NMATCH                         241
+#define TK_CONTAINS                       242
+#define TK_IN                             243
+#define TK_JOIN                           244
+#define TK_INNER                          245
+#define TK_SELECT                         246
+#define TK_DISTINCT                       247
+#define TK_WHERE                          248
+#define TK_PARTITION                      249
+#define TK_BY                             250
+#define TK_SESSION                        251
+#define TK_STATE_WINDOW                   252
+#define TK_EVENT_WINDOW                   253
+#define TK_START                          254
+#define TK_SLIDING                        255
+#define TK_FILL                           256
+#define TK_VALUE                          257
+#define TK_NONE                           258
+#define TK_PREV                           259
+#define TK_LINEAR                         260
+#define TK_NEXT                           261
+#define TK_HAVING                         262
+#define TK_RANGE                          263
+#define TK_EVERY                          264
+#define TK_ORDER                          265
+#define TK_SLIMIT                         266
+#define TK_SOFFSET                        267
+#define TK_LIMIT                          268
+#define TK_OFFSET                         269
+#define TK_ASC                            270
+#define TK_NULLS                          271
+#define TK_ABORT                          272
+#define TK_AFTER                          273
+#define TK_ATTACH                         274
+#define TK_BEFORE                         275
+#define TK_BEGIN                          276
+#define TK_BITAND                         277
+#define TK_BITNOT                         278
+#define TK_BITOR                          279
+#define TK_BLOCKS                         280
+#define TK_CHANGE                         281
+#define TK_COMMA                          282
+#define TK_COMPACT                        283
+#define TK_CONCAT                         284
+#define TK_CONFLICT                       285
+#define TK_COPY                           286
+#define TK_DEFERRED                       287
+#define TK_DELIMITERS                     288
+#define TK_DETACH                         289
+#define TK_DIVIDE                         290
+#define TK_DOT                            291
+#define TK_EACH                           292
+#define TK_FAIL                           293
+#define TK_FILE                           294
+#define TK_FOR                            295
+#define TK_GLOB                           296
+#define TK_ID                             297
+#define TK_IMMEDIATE                      298
+#define TK_IMPORT                         299
+#define TK_INITIALLY                      300
+#define TK_INSTEAD                        301
+#define TK_ISNULL                         302
+#define TK_KEY                            303
+#define TK_MODULES                        304
+#define TK_NK_BITNOT                      305
+#define TK_NK_SEMI                        306
+#define TK_NOTNULL                        307
+#define TK_OF                             308
+#define TK_PLUS                           309
+#define TK_PRIVILEGE                      310
+#define TK_RAISE                          311
+#define TK_REPLACE                        312
+#define TK_RESTRICT                       313
+#define TK_ROW                            314
+#define TK_SEMI                           315
+#define TK_STAR                           316
+#define TK_STATEMENT                      317
+#define TK_STRICT                         318
+#define TK_STRING                         319
+#define TK_TIMES                          320
+#define TK_UPDATE                         321
+#define TK_VALUES                         322
+#define TK_VARIABLE                       323
+#define TK_VIEW                           324
+#define TK_WAL                            325
 
 #define TK_NK_SPACE   600
 #define TK_NK_COMMENT 601

include/libs/command/command.h

@@ -22,7 +22,7 @@
 
 typedef struct SExplainCtx SExplainCtx;
 
-int32_t qExecCommand(bool sysInfoUser, SNode *pStmt, SRetrieveTableRsp **pRsp);
+int32_t qExecCommand(int64_t* pConnId, bool sysInfoUser, SNode *pStmt, SRetrieveTableRsp **pRsp);
 
 int32_t qExecStaticExplain(SQueryPlan *pDag, SRetrieveTableRsp **pRsp);
 int32_t qExecExplainBegin(SQueryPlan *pDag, SExplainCtx **pCtx, int64_t startTs);

include/libs/nodes/cmdnodes.h

@@ -40,6 +40,7 @@ extern "C" {
 #define SHOW_LOCAL_VARIABLES_RESULT_FIELD1_LEN (TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE)
 #define SHOW_LOCAL_VARIABLES_RESULT_FIELD2_LEN (TSDB_CONFIG_VALUE_LEN + VARSTR_HEADER_SIZE)
 
+#define SHOW_ALIVE_RESULT_COLS 1
 #define PRIVILEGE_TYPE_MASK(n) (1 << n)
 
 #define PRIVILEGE_TYPE_ALL       PRIVILEGE_TYPE_MASK(0)
@@ -262,6 +263,11 @@ typedef struct SShowCreateDatabaseStmt {
   void*     pCfg;  // SDbCfgInfo
 } SShowCreateDatabaseStmt;
 
+typedef struct SShowAliveStmt {
+  ENodeType type;
+  char      dbName[TSDB_DB_NAME_LEN];
+} SShowAliveStmt;
+
 typedef struct SShowCreateTableStmt {
   ENodeType type;
   char      dbName[TSDB_DB_NAME_LEN];

include/libs/nodes/nodes.h

@@ -208,6 +208,8 @@ typedef enum ENodeType {
   QUERY_NODE_DELETE_STMT,
   QUERY_NODE_INSERT_STMT,
   QUERY_NODE_QUERY,
+  QUERY_NODE_SHOW_DB_ALIVE_STMT,
+  QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT,  
 
   // logic plan node
   QUERY_NODE_LOGIC_PLAN_SCAN = 1000,

source/client/src/clientImpl.c

@@ -272,7 +272,7 @@ int32_t parseSql(SRequestObj* pRequest, bool topicQuery, SQuery** pQuery, SStmtC
 
 int32_t execLocalCmd(SRequestObj* pRequest, SQuery* pQuery) {
   SRetrieveTableRsp* pRsp = NULL;
-  int32_t            code = qExecCommand(pRequest->pTscObj->sysInfo, pQuery->pRoot, &pRsp);
+  int32_t            code = qExecCommand(&pRequest->pTscObj->id, pRequest->pTscObj->sysInfo, pQuery->pRoot, &pRsp);
   if (TSDB_CODE_SUCCESS == code && NULL != pRsp) {
     code = setQueryResultFromRsp(&pRequest->body.resInfo, pRsp, false, true);
   }
@@ -310,7 +310,7 @@ void asyncExecLocalCmd(SRequestObj* pRequest, SQuery* pQuery) {
     return;
   }
 
-  int32_t code = qExecCommand(pRequest->pTscObj->sysInfo, pQuery->pRoot, &pRsp);
+  int32_t code = qExecCommand(&pRequest->pTscObj->id ,pRequest->pTscObj->sysInfo, pQuery->pRoot, &pRsp);
   if (TSDB_CODE_SUCCESS == code && NULL != pRsp) {
     code = setQueryResultFromRsp(&pRequest->body.resInfo, pRsp, false, true);
   }

source/libs/command/src/command.c

@@ -21,6 +21,7 @@
 #include "tdatablock.h"
 #include "tglobal.h"
 #include "tgrant.h"
+#include "taosdef.h"
 
 extern SConfig* tsCfg;
 
@@ -154,6 +155,23 @@ static int32_t buildCreateDBResultDataBlock(SSDataBlock** pOutput) {
   return code;
 }
 
+static int32_t buildAliveResultDataBlock(SSDataBlock** pOutput) {
+  SSDataBlock* pBlock = createDataBlock();
+  if (NULL == pBlock) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+
+  SColumnInfoData infoData = createColumnInfoData(TSDB_DATA_TYPE_INT, sizeof(int32_t), 1);
+  int32_t         code = blockDataAppendColInfo(pBlock, &infoData);
+
+  if (TSDB_CODE_SUCCESS == code) {
+    *pOutput = pBlock;
+  } else {
+    blockDataDestroy(pBlock);
+  }
+  return code;
+}
+
 int64_t getValOfDiffPrecision(int8_t unit, int64_t val) {
   int64_t v = 0;
   switch (unit) {
@@ -281,6 +299,108 @@ static void setCreateDBResultIntoDataBlock(SSDataBlock* pBlock, char* dbFName, S
   colDataAppend(pCol2, 0, buf2, false);
 }
 
+#define CHECK_LEADER(n) (row[n] && (fields[n].type == TSDB_DATA_TYPE_VARCHAR && strncasecmp(row[n], "leader", varDataLen((char *)row[n] - VARSTR_HEADER_SIZE)) == 0))
+// on this row, if have leader return true else return false
+bool existLeaderRole(TAOS_ROW row, TAOS_FIELD* fields, int nFields) {
+  // vgroup_id | db_name | tables | v1_dnode | v1_status | v2_dnode | v2_status | v3_dnode | v3_status | v4_dnode |
+  // v4_status |  cacheload  | tsma |
+  if (nFields != 13) {
+    return false;
+  }
+
+  // check have leader on cloumn v*_status on 4 6 8 10
+  if (CHECK_LEADER(4) || CHECK_LEADER(6) || CHECK_LEADER(8) || CHECK_LEADER(10)) {
+    return true;
+  }
+
+  return false;
+}
+
+// get db alive status, return 1 is alive else return 0
+int32_t getAliveStatusFromApi(int64_t* pConnId, char* dbName, int32_t* pStatus) {
+  char    sql[128 + TSDB_DB_NAME_LEN] = "select * from information_schema.ins_vgroups";
+  int32_t code;
+
+  // filter with db name
+  if (dbName && dbName[0] != 0) {
+    char str[64 + TSDB_DB_NAME_LEN] = "";
+    // test db name exist
+    sprintf(str, "show create database %s ;", dbName);
+    TAOS_RES* dbRes = taos_query(pConnId, str);
+    code = taos_errno(dbRes);
+    if (code != TSDB_CODE_SUCCESS) {
+      taos_free_result(dbRes);
+      return code;
+    }
+    taos_free_result(dbRes);
+
+    sprintf(str, " where db_name='%s' ;", dbName);
+    strcat(sql, str);
+  }
+
+  TAOS_RES* res = taos_query(pConnId, sql);
+  code = taos_errno(res);
+  if (code != TSDB_CODE_SUCCESS) {
+    taos_free_result(res);
+    return code;
+  }
+
+  TAOS_ROW    row = NULL;
+  TAOS_FIELD* fields = taos_fetch_fields(res);
+  int32_t     nFields = taos_num_fields(res);
+  int32_t     nAvailble = 0;
+  int32_t     nUnAvailble = 0;
+
+  while ((row = taos_fetch_row(res)) != NULL) {
+    if (existLeaderRole(row, fields, nFields)) {
+      nAvailble++;
+    } else {
+      nUnAvailble++;
+    }
+  }
+  taos_free_result(res);
+
+  int32_t status = 0;
+  if (nAvailble + nUnAvailble == 0 || nUnAvailble == 0) {
+    status = SHOW_STATUS_AVAILABLE;
+  } else if (nAvailble > 0 && nUnAvailble > 0) {
+    status = SHOW_STATUS_HALF_AVAILABLE;
+  } else {
+    status = SHOW_STATUS_NOT_AVAILABLE;
+  }
+
+  if (pStatus) {
+    *pStatus = status;
+  }
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t setAliveResultIntoDataBlock(int64_t* pConnId, SSDataBlock* pBlock, char* dbName) {
+  blockDataEnsureCapacity(pBlock, 1);
+  pBlock->info.rows = 1;
+
+  SColumnInfoData* pCol1 = taosArrayGet(pBlock->pDataBlock, 0);
+  int32_t          status = 0;
+  int32_t          code = getAliveStatusFromApi(pConnId, dbName, &status);
+  if (code == TSDB_CODE_SUCCESS) {
+    colDataAppend(pCol1, 0, (const char*)&status, false);
+  }
+  return code;
+}
+
+static int32_t execShowAliveStatus(int64_t* pConnId, SShowAliveStmt* pStmt, SRetrieveTableRsp** pRsp) {
+  SSDataBlock* pBlock = NULL;
+  int32_t      code = buildAliveResultDataBlock(&pBlock);
+  if (TSDB_CODE_SUCCESS == code) {
+    code = setAliveResultIntoDataBlock(pConnId, pBlock, pStmt->dbName);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = buildRetrieveTableRsp(pBlock, SHOW_ALIVE_RESULT_COLS, pRsp);
+  }
+  blockDataDestroy(pBlock);
+  return code;
+}
+
 static int32_t execShowCreateDatabase(SShowCreateDatabaseStmt* pStmt, SRetrieveTableRsp** pRsp) {
   SSDataBlock* pBlock = NULL;
   int32_t      code = buildCreateDBResultDataBlock(&pBlock);
@@ -736,7 +856,7 @@ static int32_t execSelectWithoutFrom(SSelectStmt* pSelect, SRetrieveTableRsp** p
   return code;
 }
 
-int32_t qExecCommand(bool sysInfoUser, SNode* pStmt, SRetrieveTableRsp** pRsp) {
+int32_t qExecCommand(int64_t* pConnId, bool sysInfoUser, SNode* pStmt, SRetrieveTableRsp** pRsp) {
   switch (nodeType(pStmt)) {
     case QUERY_NODE_DESCRIBE_STMT:
       return execDescribe(sysInfoUser, pStmt, pRsp);
@@ -754,6 +874,9 @@ int32_t qExecCommand(bool sysInfoUser, SNode* pStmt, SRetrieveTableRsp** pRsp) {
       return execShowLocalVariables(pRsp);
     case QUERY_NODE_SELECT_STMT:
       return execSelectWithoutFrom((SSelectStmt*)pStmt, pRsp);
+    case QUERY_NODE_SHOW_DB_ALIVE_STMT:
+    case QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT:
+      return execShowAliveStatus(pConnId, (SShowAliveStmt*)pStmt, pRsp);       
     default:
       break;
   }

source/libs/nodes/src/nodesCodeFuncs.c

@@ -173,6 +173,10 @@ const char* nodesNodeName(ENodeType type) {
       return "BalanceVgroupStmt";
     case QUERY_NODE_MERGE_VGROUP_STMT:
       return "MergeVgroupStmt";
+    case QUERY_NODE_SHOW_DB_ALIVE_STMT:
+      return "ShowDbAliveStmt";
+    case QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT:
+      return "ShowClusterAliveStmt";      
     case QUERY_NODE_REDISTRIBUTE_VGROUP_STMT:
       return "RedistributeVgroupStmt";
     case QUERY_NODE_SPLIT_VGROUP_STMT:

source/libs/nodes/src/nodesUtilFuncs.c

@@ -434,6 +434,9 @@ SNode* nodesMakeNode(ENodeType type) {
       return makeNode(type, sizeof(SShowDnodeVariablesStmt));
     case QUERY_NODE_SHOW_CREATE_DATABASE_STMT:
       return makeNode(type, sizeof(SShowCreateDatabaseStmt));
+    case QUERY_NODE_SHOW_DB_ALIVE_STMT:
+    case QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT:
+      return makeNode(type, sizeof(SShowAliveStmt));      
     case QUERY_NODE_SHOW_CREATE_TABLE_STMT:
     case QUERY_NODE_SHOW_CREATE_STABLE_STMT:
       return makeNode(type, sizeof(SShowCreateTableStmt));
@@ -960,6 +963,8 @@ void nodesDestroyNode(SNode* pNode) {
     case QUERY_NODE_SHOW_USERS_STMT:
     case QUERY_NODE_SHOW_LICENCES_STMT:
     case QUERY_NODE_SHOW_VGROUPS_STMT:
+    case QUERY_NODE_SHOW_DB_ALIVE_STMT:
+    case QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT:    
     case QUERY_NODE_SHOW_TOPICS_STMT:
     case QUERY_NODE_SHOW_CONSUMERS_STMT:
     case QUERY_NODE_SHOW_CONNECTIONS_STMT:

source/libs/parser/inc/parAst.h

@@ -176,6 +176,7 @@ SNode* createShowStmt(SAstCreateContext* pCxt, ENodeType type);
 SNode* createShowStmtWithCond(SAstCreateContext* pCxt, ENodeType type, SNode* pDbName, SNode* pTbName,
                               EOperatorType tableCondType);
 SNode* createShowCreateDatabaseStmt(SAstCreateContext* pCxt, SToken* pDbName);
+SNode* createShowAliveStmt(SAstCreateContext* pCxt, SNode* pDbName, ENodeType type);
 SNode* createShowCreateTableStmt(SAstCreateContext* pCxt, ENodeType type, SNode* pRealTable);
 SNode* createShowTableDistributedStmt(SAstCreateContext* pCxt, SNode* pRealTable);
 SNode* createShowDnodeVariablesStmt(SAstCreateContext* pCxt, SNode* pDnodeId, SNode* pLikePattern);

source/libs/parser/inc/sql.y

@@ -433,6 +433,9 @@ cmd ::= SHOW TAGS FROM table_name_cond(A) from_db_opt(B).
 cmd ::= SHOW TABLE TAGS tag_list_opt(C) FROM table_name_cond(A) from_db_opt(B).   { pCxt->pRootNode = createShowTableTagsStmt(pCxt, A, B, C); }
 cmd ::= SHOW VNODES NK_INTEGER(A).                                                { pCxt->pRootNode = createShowVnodesStmt(pCxt, createValueNode(pCxt, TSDB_DATA_TYPE_BIGINT, &A), NULL); }
 cmd ::= SHOW VNODES NK_STRING(A).                                                 { pCxt->pRootNode = createShowVnodesStmt(pCxt, NULL, createValueNode(pCxt, TSDB_DATA_TYPE_VARCHAR, &A)); }
+// show alive
+cmd ::= SHOW db_name_cond_opt(A) ALIVE.                                           { pCxt->pRootNode = createShowAliveStmt(pCxt, A,    QUERY_NODE_SHOW_DB_ALIVE_STMT); }
+cmd ::= SHOW CLUSTER ALIVE.                                                       { pCxt->pRootNode = createShowAliveStmt(pCxt, NULL, QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT); }
 
 db_name_cond_opt(A) ::= .                                                         { A = createDefaultDatabaseCondValue(pCxt); }
 db_name_cond_opt(A) ::= db_name(B) NK_DOT.                                        { A = createIdentifierValueNode(pCxt, &B); }

source/libs/parser/src/parAstCreater.c

@@ -1370,6 +1370,38 @@ SNode* createShowCreateDatabaseStmt(SAstCreateContext* pCxt, SToken* pDbName) {
   return (SNode*)pStmt;
 }
 
+SNode* createShowAliveStmt(SAstCreateContext* pCxt, SNode* pNode, ENodeType type) {
+  CHECK_PARSER_STATUS(pCxt);
+  SToken  dbToken = {0};
+  SToken* pDbToken = NULL;
+
+  if (pNode) {
+    SValueNode* pDbName = (SValueNode*)pNode;
+    if (pDbName->literal) {
+      dbToken.z = pDbName->literal;
+      dbToken.n = strlen(pDbName->literal);
+      pDbToken = &dbToken;
+    }
+  }
+
+  if (pDbToken && !checkDbName(pCxt, pDbToken, true)) {
+    nodesDestroyNode(pNode);
+    return NULL;
+  }
+
+  SShowAliveStmt* pStmt = (SShowAliveStmt*)nodesMakeNode(type);
+  CHECK_OUT_OF_MEM(pStmt);
+
+  if (pDbToken) {
+    COPY_STRING_FORM_ID_TOKEN(pStmt->dbName, pDbToken);
+  }
+  if (pNode) {
+    nodesDestroyNode(pNode);
+  }
+
+  return (SNode*)pStmt;
+}
+
 SNode* createShowCreateTableStmt(SAstCreateContext* pCxt, ENodeType type, SNode* pRealTable) {
   CHECK_PARSER_STATUS(pCxt);
   SShowCreateTableStmt* pStmt = (SShowCreateTableStmt*)nodesMakeNode(type);

source/libs/parser/src/parAuthenticator.c

@@ -145,6 +145,8 @@ static int32_t authQuery(SAuthCxt* pCxt, SNode* pStmt) {
     case QUERY_NODE_SHOW_CLUSTER_STMT:
     case QUERY_NODE_SHOW_LICENCES_STMT:
     case QUERY_NODE_SHOW_VGROUPS_STMT:
+    case QUERY_NODE_SHOW_DB_ALIVE_STMT:
+    case QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT:    
     case QUERY_NODE_SHOW_CREATE_DATABASE_STMT:
     case QUERY_NODE_SHOW_TABLE_DISTRIBUTED_STMT:
     case QUERY_NODE_SHOW_VNODES_STMT:

source/libs/parser/src/parTokenizer.c

@@ -269,6 +269,7 @@ static SKeyword keywordTable[] = {
     {"_WDURATION",           TK_WDURATION},
     {"_WEND",                TK_WEND},
     {"_WSTART",              TK_WSTART},
+    {"ALIVE",                TK_ALIVE},
 };
 // clang-format on
 

source/libs/parser/src/parTranslater.c

@@ -6229,6 +6229,20 @@ static int32_t extractShowCreateDatabaseResultSchema(int32_t* numOfCols, SSchema
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t extractShowAliveResultSchema(int32_t* numOfCols, SSchema** pSchema) {
+  *numOfCols = 1;
+  *pSchema = taosMemoryCalloc((*numOfCols), sizeof(SSchema));
+  if (NULL == (*pSchema)) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+
+  (*pSchema)[0].type = TSDB_DATA_TYPE_INT;
+  (*pSchema)[0].bytes = sizeof(int32_t);
+  strcpy((*pSchema)[0].name, "status");
+
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t extractShowCreateTableResultSchema(int32_t* numOfCols, SSchema** pSchema) {
   *numOfCols = 2;
   *pSchema = taosMemoryCalloc((*numOfCols), sizeof(SSchema));
@@ -6280,6 +6294,9 @@ int32_t extractResultSchema(const SNode* pRoot, int32_t* numOfCols, SSchema** pS
       return extractDescribeResultSchema(numOfCols, pSchema);
     case QUERY_NODE_SHOW_CREATE_DATABASE_STMT:
       return extractShowCreateDatabaseResultSchema(numOfCols, pSchema);
+    case QUERY_NODE_SHOW_DB_ALIVE_STMT:
+    case QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT:
+      return extractShowAliveResultSchema(numOfCols, pSchema);      
     case QUERY_NODE_SHOW_CREATE_TABLE_STMT:
     case QUERY_NODE_SHOW_CREATE_STABLE_STMT:
       return extractShowCreateTableResultSchema(numOfCols, pSchema);
@@ -7799,6 +7816,8 @@ static int32_t setQuery(STranslateContext* pCxt, SQuery* pQuery) {
       break;
     case QUERY_NODE_DESCRIBE_STMT:
     case QUERY_NODE_SHOW_CREATE_DATABASE_STMT:
+    case QUERY_NODE_SHOW_DB_ALIVE_STMT:
+    case QUERY_NODE_SHOW_CLUSTER_ALIVE_STMT:    
     case QUERY_NODE_SHOW_CREATE_TABLE_STMT:
     case QUERY_NODE_SHOW_CREATE_STABLE_STMT:
     case QUERY_NODE_SHOW_LOCAL_VARIABLES_STMT:

tools/shell/src/shellAuto.c

@@ -138,6 +138,7 @@ SWords shellCommands[] = {
     {"show create table <tb_name> \\G;", 0, 0, NULL},
     {"show connections;", 0, 0, NULL},
     {"show cluster;", 0, 0, NULL},
+    {"show cluster alive;", 0, 0, NULL},
     {"show databases;", 0, 0, NULL},
     {"show dnodes;", 0, 0, NULL},
     {"show dnode <dnode_id> variables;", 0, 0, NULL},
@@ -425,6 +426,7 @@ void showHelp() {
     show create table <tb_name>;\n\
     show connections;\n\
     show cluster;\n\
+    show cluster alive;\n\
     show databases;\n\
     show dnodes;\n\
     show dnode <dnode_id> variables;\n\