TD-2354<feature>: implement last_row cache

src/inc/tsdb.h

@@ -66,6 +66,7 @@ typedef struct {
   int8_t  precision;
   int8_t  compression;
   int8_t  update;
+  int8_t  cacheLastRow;
 } STsdbCfg;
 
 // --------- TSDB REPOSITORY USAGE STATISTICS
@@ -119,7 +120,7 @@ STableCfg *tsdbCreateTableCfgFromMsg(SMDCreateTableMsg *pMsg);
 int   tsdbCreateTable(TSDB_REPO_T *repo, STableCfg *pCfg);
 int   tsdbDropTable(TSDB_REPO_T *pRepo, STableId tableId);
 int   tsdbUpdateTableTagValue(TSDB_REPO_T *repo, SUpdateTableTagValMsg *pMsg);
-TSKEY tsdbGetTableLastKey(TSDB_REPO_T *repo, uint64_t uid);
+// TSKEY tsdbGetTableLastKey(TSDB_REPO_T *repo, uint64_t uid);
 
 uint32_t tsdbGetFileInfo(TSDB_REPO_T *repo, char *name, uint32_t *index, uint32_t eindex, int64_t *size);
 

src/tsdb/inc/tsdbMain.h

@@ -66,7 +66,10 @@ typedef struct STable {
   SSkipList*     pIndex;         // For TSDB_SUPER_TABLE, it is the skiplist index
   void*          eventHandler;   // TODO
   void*          streamHandler;  // TODO
-  TSKEY          lastKey;        // lastkey inserted in this table, initialized as 0, TODO: make a structure
+  union {
+    TSKEY    lastKey;
+    SDataRow lastRow;
+  };
   char*          sql;
   void*          cqhandle;
   SRWLatch       latch;  // TODO: implementa latch functions
@@ -360,8 +363,11 @@ typedef struct {
 #define TABLE_UID(t) (t)->tableId.uid
 #define TABLE_TID(t) (t)->tableId.tid
 #define TABLE_SUID(t) (t)->suid
-#define TABLE_LASTKEY(t) (t)->lastKey
 #define TSDB_META_FILE_MAGIC(m) KVSTORE_MAGIC((m)->pStore)
+#define TSDB_RLOCK_TABLE(t) taosRLockLatch(&((t)->latch))
+#define TSDB_RUNLOCK_TABLE(t) taosRUnLockLatch(&((t)->latch))
+#define TSDB_WLOCK_TABLE(t) taosWLockLatch(&((t)->latch))
+#define TSDB_WUNLOCK_TABLE(t) taosWUnLockLatch(&((t)->latch))
 
 STsdbMeta* tsdbNewMeta(STsdbCfg* pCfg);
 void       tsdbFreeMeta(STsdbMeta* pMeta);
@@ -391,7 +397,7 @@ static FORCE_INLINE STSchema* tsdbGetTableSchemaImpl(STable* pTable, bool lock,
   STSchema* pSchema = NULL;
   STSchema* pTSchema = NULL;
 
-  if (lock) taosRLockLatch(&(pDTable->latch));
+  if (lock) TSDB_RLOCK_TABLE(pDTable);
   if (version < 0) {  // get the latest version of schema
     pTSchema = pDTable->schema[pDTable->numOfSchemas - 1];
   } else {  // get the schema with version
@@ -413,7 +419,7 @@ static FORCE_INLINE STSchema* tsdbGetTableSchemaImpl(STable* pTable, bool lock,
   }
 
 _exit:
-  if (lock) taosRUnLockLatch(&(pDTable->latch));
+  if (lock) TSDB_RUNLOCK_TABLE(pDTable);
   return pSchema;
 }
 
@@ -433,6 +439,18 @@ static FORCE_INLINE STSchema *tsdbGetTableTagSchema(STable *pTable) {
   }
 }
 
+static FORCE_INLINE TSKEY tsdbGetTableLastKeyImpl(STable* pTable, bool cacheLastRow) {
+  if (cacheLastRow) {
+    if (pTable->lastRow == NULL) {
+      return TSKEY_INITIAL_VAL;
+    } else {
+      return dataRowKey(pTable->lastRow);
+    }
+  } else {
+    return pTable->lastKey;
+  }
+}
+
 // ------------------ tsdbBuffer.c
 #define TSDB_BUFFER_RESERVE 1024  // Reseve 1K as commit threshold
 

src/tsdb/src/tsdbCommit.c

@@ -220,7 +220,7 @@ static int tsdbCommitToFile(STsdbRepo *pRepo, int fid, SCommitIter *iters, SRWHe
     SCommitIter *pIter = iters + tid;
     if (pIter->pTable == NULL) continue;
 
-    taosRLockLatch(&(pIter->pTable->latch));
+    TSDB_RLOCK_TABLE(pIter->pTable);
 
     if (tsdbSetHelperTable(pHelper, pIter->pTable, pRepo) < 0) goto _err;
 
@@ -231,7 +231,7 @@ static int tsdbCommitToFile(STsdbRepo *pRepo, int fid, SCommitIter *iters, SRWHe
       }
 
       if (tsdbCommitTableData(pHelper, pIter, pDataCols, maxKey) < 0) {
-        taosRUnLockLatch(&(pIter->pTable->latch));
+        TSDB_RUNLOCK_TABLE(pIter->pTable);
         tsdbError("vgId:%d failed to write data of table %s tid %d uid %" PRIu64 " since %s", REPO_ID(pRepo),
                   TABLE_CHAR_NAME(pIter->pTable), TABLE_TID(pIter->pTable), TABLE_UID(pIter->pTable),
                   tstrerror(terrno));
@@ -239,7 +239,7 @@ static int tsdbCommitToFile(STsdbRepo *pRepo, int fid, SCommitIter *iters, SRWHe
       }
     }
 
-    taosRUnLockLatch(&(pIter->pTable->latch));
+    TSDB_RUNLOCK_TABLE(pIter->pTable);
 
     // Move the last block to the new .l file if neccessary
     if (tsdbMoveLastBlockIfNeccessary(pHelper) < 0) {

src/tsdb/src/tsdbMain.c

@@ -77,9 +77,9 @@ int32_t tsdbCreateRepo(char *rootDir, STsdbCfg *pCfg) {
 
   tsdbDebug(
       "vgId:%d tsdb env create succeed! cacheBlockSize %d totalBlocks %d daysPerFile %d keep "
-      "%d minRowsPerFileBlock %d maxRowsPerFileBlock %d precision %d compression %d",
+      "%d minRowsPerFileBlock %d maxRowsPerFileBlock %d precision %d compression %d update %d cacheLastRow %d",
       pCfg->tsdbId, pCfg->cacheBlockSize, pCfg->totalBlocks, pCfg->daysPerFile, pCfg->keep, pCfg->minRowsPerFileBlock,
-      pCfg->maxRowsPerFileBlock, pCfg->precision, pCfg->compression);
+      pCfg->maxRowsPerFileBlock, pCfg->precision, pCfg->compression, pCfg->update, pCfg->cacheLastRow);
   return 0;
 }
 
@@ -475,6 +475,9 @@ static int32_t tsdbCheckAndSetDefaultCfg(STsdbCfg *pCfg) {
   // update check
   if (pCfg->update != 0) pCfg->update = 1;
 
+  // update cacheLastRow
+  if (pCfg->cacheLastRow != 0) pCfg->cacheLastRow = 1;
+
   return 0;
 
 _err:
@@ -692,10 +695,12 @@ static void tsdbFreeRepo(STsdbRepo *pRepo) {
   }
 }
 
-static int tsdbRestoreInfo(STsdbRepo *pRepo) {
+static int tsdbRestoreInfo(STsdbRepo *pRepo) { // TODO
   STsdbMeta * pMeta = pRepo->tsdbMeta;
   STsdbFileH *pFileH = pRepo->tsdbFileH;
   SFileGroup *pFGroup = NULL;
+  STsdbCfg *  pCfg = &(pRepo->config);
+  SCompBlock *pBlock = NULL;
 
   SFileGroupIter iter;
   SRWHelper      rhelper = {0};
@@ -713,7 +718,33 @@ static int tsdbRestoreInfo(STsdbRepo *pRepo) {
       if (tsdbSetHelperTable(&rhelper, pTable, pRepo) < 0) goto _err;
       SCompIdx *pIdx = &(rhelper.curCompIdx);
 
-      if (pIdx->offset > 0 && pTable->lastKey < pIdx->maxKey) pTable->lastKey = pIdx->maxKey;
+      TSKEY lastKey = tsdbGetTableLastKeyImpl(pTable, pCfg->cacheLastRow);
+      if (pIdx->offset > 0 && lastKey < pIdx->maxKey) {
+        if (pCfg->cacheLastRow) { // load the block of data
+          if (tsdbLoadCompInfo(&rhelper, NULL) < 0) goto _err;
+
+          pBlock = rhelper.pCompInfo->blocks + pIdx->numOfBlocks - 1;
+          if (tsdbLoadBlockData(&rhelper, pBlock, NULL) < 0) goto _err;
+
+          // construct the data row
+          ASSERT(pTable->lastRow == NULL);
+          STSchema *pSchema = tsdbGetTableSchema(pTable);
+          pTable->lastRow = taosTMalloc(schemaTLen(pSchema));
+          if (pTable->lastRow == NULL) {
+            goto _err;
+          }
+
+          tdInitDataRow(pTable->lastRow, pSchema);
+          for (int icol = 0; icol < schemaNCols(pSchema); icol++) {
+            STColumn *pCol = schemaColAt(pSchema, icol);
+            SDataCol *pDataCol = rhelper.pDataCols[0]->cols + icol;
+            tdAppendColVal(pTable->lastRow, tdGetColDataOfRow(pDataCol, pBlock->numOfRows - 1), pCol->type, pCol->bytes,
+                           pCol->offset);
+          }
+        } else {
+          pTable->lastKey = pIdx->maxKey;
+        }
+      }
     }
   }
 
@@ -800,6 +831,7 @@ static int tsdbEncodeCfg(void **buf, STsdbCfg *pCfg) {
   tlen += taosEncodeFixedI8(buf, pCfg->precision);
   tlen += taosEncodeFixedI8(buf, pCfg->compression);
   tlen += taosEncodeFixedI8(buf, pCfg->update);
+  tlen += taosEncodeFixedI8(buf, pCfg->cacheLastRow);
 
   return tlen;
 }
@@ -817,6 +849,7 @@ static void *tsdbDecodeCfg(void *buf, STsdbCfg *pCfg) {
   buf = taosDecodeFixedI8(buf, &(pCfg->precision));
   buf = taosDecodeFixedI8(buf, &(pCfg->compression));
   buf = taosDecodeFixedI8(buf, &(pCfg->update));
+  buf = taosDecodeFixedI8(buf, &(pCfg->cacheLastRow));
 
   return buf;
 }

src/tsdb/src/tsdbMemTable.c

@@ -35,6 +35,7 @@ static int          tsdbGetSubmitMsgNext(SSubmitMsgIter *pIter, SSubmitBlk **pPB
 static int          tsdbCheckTableSchema(STsdbRepo *pRepo, SSubmitBlk *pBlock, STable *pTable);
 static int          tsdbInsertDataToTableImpl(STsdbRepo *pRepo, STable *pTable, void **rows, int rowCounter);
 static void         tsdbFreeRows(STsdbRepo *pRepo, void **rows, int rowCounter);
+static int          tsdbUpdateTableLatestInfo(STsdbRepo *pRepo, STable *pTable, SDataRow row);
 
 static FORCE_INLINE int tsdbCheckRowRange(STsdbRepo *pRepo, STable *pTable, SDataRow row, TSKEY minKey, TSKEY maxKey,
                                           TSKEY now);
@@ -663,9 +664,10 @@ static int tsdbCopyRowToMem(STsdbRepo *pRepo, SDataRow row, STable *pTable, void
       return -1;
     }
 
-    if (key > TABLE_LASTKEY(pTable)) {
+    TSKEY lastKey = tsdbGetTableLastKeyImpl(pTable, pCfg->cacheLastRow);
+    if (key > lastKey) {
       tsdbTrace("vgId:%d skip to delete row key %" PRId64 " which is larger than table lastKey %" PRId64,
-                REPO_ID(pRepo), key, TABLE_LASTKEY(pTable));
+                REPO_ID(pRepo), key, lastKey);
       return 0;
     }
   }
@@ -846,8 +848,10 @@ static int tsdbInsertDataToTableImpl(STsdbRepo *pRepo, STable *pTable, void **ro
   if (pTableData->keyLast < dataRowKey(rows[rowCounter - 1])) pTableData->keyLast = dataRowKey(rows[rowCounter - 1]);
   pTableData->numOfRows += dsize;
 
-  // TODO: impl delete row thing
-  if (TABLE_LASTKEY(pTable) < dataRowKey(rows[rowCounter-1])) TABLE_LASTKEY(pTable) = dataRowKey(rows[rowCounter-1]);
+  // update table latest info
+  if (tsdbUpdateTableLatestInfo(pRepo, pTable, rows[rowCounter - 1]) < 0) {
+    return -1;
+  }
 
   return 0;
 }
@@ -889,4 +893,36 @@ static void tsdbFreeRows(STsdbRepo *pRepo, void **rows, int rowCounter) {
       }
     }
   }
+}
+
+static int tsdbUpdateTableLatestInfo(STsdbRepo *pRepo, STable *pTable, SDataRow row) {
+  STsdbCfg *pCfg = &pRepo->config;
+
+  if (tsdbGetTableLastKeyImpl(pTable, pCfg->cacheLastRow) < dataRowKey(row)) {
+    if (pCfg->cacheLastRow) {
+      SDataRow nrow = pTable->lastRow;
+      if (taosTSizeof(nrow) < dataRowLen(row)) {
+        SDataRow orow = nrow;
+        nrow = taosTMalloc(dataRowLen(row));
+        if (nrow == NULL) {
+          terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
+          return -1;
+        }
+
+        dataRowCpy(nrow, row);
+        TSDB_WLOCK_TABLE(pTable);
+        pTable->lastRow = nrow;
+        TSDB_WUNLOCK_TABLE(pTable);
+        taosTZfree(orow);
+      } else {
+        TSDB_WLOCK_TABLE(pTable);
+        dataRowCpy(nrow, row);
+        TSDB_WUNLOCK_TABLE(pTable);
+      }
+    } else {
+      pTable->lastKey = dataRowKey(row);
+    }
+  }
+
+  return 0;
 }
\ No newline at end of file

src/tsdb/src/tsdbMeta.c

@@ -377,11 +377,11 @@ int tsdbUpdateTableTagValue(TSDB_REPO_T *repo, SUpdateTableTagValMsg *pMsg) {
 
   // Chage in memory
   if (pNewSchema != NULL) { // change super table tag schema
-    taosWLockLatch(&(pTable->pSuper->latch));
+    TSDB_WLOCK_TABLE(pTable->pSuper);
     STSchema *pOldSchema = pTable->pSuper->tagSchema;
     pTable->pSuper->tagSchema = pNewSchema;
     tdFreeSchema(pOldSchema);
-    taosWUnLockLatch(&(pTable->pSuper->latch));
+    TSDB_WUNLOCK_TABLE(pTable->pSuper);
   }
 
   bool      isChangeIndexCol = (pMsg->colId == colColId(schemaColAt(pTable->pSuper->tagSchema, 0)));
@@ -392,9 +392,9 @@ int tsdbUpdateTableTagValue(TSDB_REPO_T *repo, SUpdateTableTagValMsg *pMsg) {
     tsdbWLockRepoMeta(pRepo);
     tsdbRemoveTableFromIndex(pMeta, pTable);
   }
-  taosWLockLatch(&(pTable->latch));
+  TSDB_WLOCK_TABLE(pTable);
   tdSetKVRowDataOfCol(&(pTable->tagVal), pMsg->colId, pMsg->type, POINTER_SHIFT(pMsg->data, pMsg->schemaLen));
-  taosWUnLockLatch(&(pTable->latch));
+  TSDB_WUNLOCK_TABLE(pTable);
   if (isChangeIndexCol) {
     tsdbAddTableIntoIndex(pMeta, pTable, false);
     tsdbUnlockRepoMeta(pRepo);
@@ -587,7 +587,7 @@ void tsdbUpdateTableSchema(STsdbRepo *pRepo, STable *pTable, STSchema *pSchema,
   STable *pCTable = (TABLE_TYPE(pTable) == TSDB_CHILD_TABLE) ? pTable->pSuper : pTable;
   ASSERT(schemaVersion(pSchema) > schemaVersion(pCTable->schema[pCTable->numOfSchemas - 1]));
 
-  taosWLockLatch(&(pCTable->latch));
+  TSDB_WLOCK_TABLE(pCTable);
   if (pCTable->numOfSchemas < TSDB_MAX_TABLE_SCHEMAS) {
     pCTable->schema[pCTable->numOfSchemas++] = pSchema;
   } else {
@@ -599,7 +599,7 @@ void tsdbUpdateTableSchema(STsdbRepo *pRepo, STable *pTable, STSchema *pSchema,
 
   if (schemaNCols(pSchema) > pMeta->maxCols) pMeta->maxCols = schemaNCols(pSchema);
   if (schemaTLen(pSchema) > pMeta->maxRowBytes) pMeta->maxRowBytes = schemaTLen(pSchema);
-  taosWUnLockLatch(&(pCTable->latch));
+  TSDB_WUNLOCK_TABLE(pCTable);
 
   if (insertAct) {
     int   tlen = tsdbGetTableEncodeSize(TSDB_UPDATE_META, pCTable);
@@ -663,7 +663,7 @@ static STable *tsdbNewTable() {
     return NULL;
   }
 
-  pTable->lastKey = TSKEY_INITIAL_VAL;
+  // pTable->lastKey = TSKEY_INITIAL_VAL;
 
   return pTable;
 }
@@ -782,6 +782,13 @@ static void tsdbFreeTable(STable *pTable) {
 
 static int tsdbAddTableToMeta(STsdbRepo *pRepo, STable *pTable, bool addIdx, bool lock) {
   STsdbMeta *pMeta = pRepo->tsdbMeta;
+  STsdbCfg * pCfg = &(pRepo->config);
+
+  if (pCfg->cacheLastRow) {
+    pTable->lastRow = NULL;
+  } else {
+    pTable->lastKey = TSKEY_INITIAL_VAL;
+  }
 
   if (lock && tsdbWLockRepoMeta(pRepo) < 0) {
     tsdbError("vgId:%d failed to add table %s to meta since %s", REPO_ID(pRepo), TABLE_CHAR_NAME(pTable),