[TS-1292]<feature>: add time offset

packaging/cfg/taos.cfg

@@ -307,3 +307,6 @@ keepColumnName            1
 
 # unit MB. Flush vnode wal file if walSize > walFlushSize and walSize > cache*0.5*blocks
 # walFlushSize         1024
+
+# unit Hour. Latency of data migration
+# keepTimeOffset     0

src/client/src/tscSQLParser.c

@@ -7303,6 +7303,7 @@ int32_t validateDNodeConfig(SMiscInfo* pOptions) {
   const int tokenDebugFlag = 4;
   const int tokenDebugFlagEnd = 20;
   const int tokenOfflineInterval = 21;
+  const int tokenKeepTimeOffset = 22;
   const SDNodeDynConfOption cfgOptions[] = {
       {"resetLog", 8},    {"resetQueryCache", 15},  {"balance", 7},     {"monitor", 7},
       {"debugFlag", 9},   {"monDebugFlag", 12},     {"vDebugFlag", 10}, {"mDebugFlag", 10},
@@ -7311,6 +7312,7 @@ int32_t validateDNodeConfig(SMiscInfo* pOptions) {
       {"dDebugFlag", 10}, {"mqttDebugFlag", 13},    {"wDebugFlag", 10}, {"tmrDebugFlag", 12},
       {"cqDebugFlag", 11},
       {"offlineInterval", 15},
+      {"keepTimeOffset", 14},
   };
 
   SStrToken* pOptionToken = taosArrayGet(pOptions->a, 1);
@@ -7350,6 +7352,14 @@ int32_t validateDNodeConfig(SMiscInfo* pOptions) {
       return TSDB_CODE_TSC_INVALID_OPERATION;  // options value is invalid
     }
     return TSDB_CODE_SUCCESS;
+  } else if ((strncasecmp(cfgOptions[tokenKeepTimeOffset].name, pOptionToken->z, pOptionToken->n) == 0) &&
+             (cfgOptions[tokenKeepTimeOffset].len == pOptionToken->n)) {
+    SStrToken* pValToken = taosArrayGet(pOptions->a, 2);
+    int32_t    val = strtol(pValToken->z, NULL, 10);
+    if (val < -23 || val > 23) {
+      return TSDB_CODE_TSC_INVALID_OPERATION;  // options value is invalid
+    }
+    return TSDB_CODE_SUCCESS;
   } else {
     SStrToken* pValToken = taosArrayGet(pOptions->a, 2);
 

src/common/inc/tglobal.h

@@ -192,6 +192,7 @@ extern float    tsReservedTmpDirectorySpace;
 extern float    tsMinimalDataDirGB;
 extern int32_t  tsTotalMemoryMB;
 extern uint32_t tsVersion;
+extern int32_t  tsKeepTimeOffset;
 
 // build info
 extern char version[];

src/common/src/tglobal.c

@@ -216,6 +216,7 @@ char   tsMnodeBakDir[PATH_MAX] = {0};
 char   tsDataDir[PATH_MAX] = {0};
 char   tsScriptDir[PATH_MAX] = {0};
 char   tsTempDir[PATH_MAX] = "/tmp/";
+int32_t tsKeepTimeOffset = 0;
 
 int32_t tsDiskCfgNum = 0;
 int32_t tsTopicBianryLen = 16000;
@@ -664,6 +665,16 @@ static void doInitGlobalConfig(void) {
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);
 
+  cfg.option = "keepTimeOffset";
+  cfg.ptr = &tsKeepTimeOffset;
+  cfg.valType = TAOS_CFG_VTYPE_INT32;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_SHOW;
+  cfg.minValue = -23;
+  cfg.maxValue = 23;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
   // 0-any; 1-mnode; 2-vnode
   cfg.option = "role";
   cfg.ptr = &tsAlternativeRole;

src/tsdb/src/tsdbCommit.c

@@ -44,6 +44,14 @@ typedef struct {
   SDataCols *  pDataCols;
 } SCommitH;
 
+/*
+ * millisecond by default
+ * for TSDB_TIME_PRECISION_MILLI: 3600000L
+ *     TSDB_TIME_PRECISION_MICRO: 3600000000L
+ *     TSDB_TIME_PRECISION_NANO:  3600000000000L
+ */
+static int64_t tsTickPerHour[] = {3600000L, 3600000000L, 3600000000000L};
+
 #define TSDB_COMMIT_REPO(ch) TSDB_READ_REPO(&(ch->readh))
 #define TSDB_COMMIT_REPO_ID(ch) REPO_ID(TSDB_READ_REPO(&(ch->readh)))
 #define TSDB_COMMIT_WRITE_FSET(ch) (&((ch)->wSet))
@@ -392,7 +400,7 @@ void tsdbGetRtnSnap(STsdbRepo *pRepo, SRtn *pRtn) {
   STsdbCfg *pCfg = REPO_CFG(pRepo);
   TSKEY     minKey, midKey, maxKey, now;
 
-  now = taosGetTimestamp(pCfg->precision);
+  now = taosGetTimestamp(pCfg->precision) - tsKeepTimeOffset * tsTickPerHour[pCfg->precision];
   minKey = now - pCfg->keep * tsTickPerDay[pCfg->precision];
   midKey = now - pCfg->keep2 * tsTickPerDay[pCfg->precision];
   maxKey = now - pCfg->keep1 * tsTickPerDay[pCfg->precision];

src/util/inc/tconfig.h

@@ -20,7 +20,7 @@
 extern "C" {
 #endif
 
-#define TSDB_CFG_MAX_NUM    132
+#define TSDB_CFG_MAX_NUM    133
 #define TSDB_CFG_PRINT_LEN  23
 #define TSDB_CFG_OPTION_LEN 24
 #define TSDB_CFG_VALUE_LEN  41