[td-5250]<enhance>: compress the tableMeta info msg.

src/client/src/tscServer.c

@@ -13,7 +13,10 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <tscompression.h>
 #include "os.h"
+#include "qPlan.h"
+#include "qTableMeta.h"
 #include "tcmdtype.h"
 #include "tlockfree.h"
 #include "trpc.h"
@@ -21,10 +24,8 @@
 #include "tscLog.h"
 #include "tscProfile.h"
 #include "tscUtil.h"
-#include "qTableMeta.h"
 #include "tsclient.h"
 #include "ttimer.h"
-#include "qPlan.h"
 
 int (*tscBuildMsg[TSDB_SQL_MAX])(SSqlObj *pSql, SSqlInfo *pInfo) = {0};
 
@@ -2048,16 +2049,27 @@ int tscProcessMultiTableMetaRsp(SSqlObj *pSql) {
   }
 
   SSqlCmd *pParentCmd = &pParentSql->cmd;
-
   SHashObj *pSet = taosHashInit(4, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), false, HASH_NO_LOCK);
 
   char* pMsg = pMultiMeta->meta;
+  char* buf = NULL;
+  if (pMultiMeta->compressed) {
+    buf = malloc(pMultiMeta->rawLen - sizeof(SMultiTableMeta));
+    int32_t len = tsDecompressString(pMultiMeta->meta, pMultiMeta->contLen - sizeof(SMultiTableMeta), 1,
+        buf, pMultiMeta->rawLen - sizeof(SMultiTableMeta), ONE_STAGE_COMP, NULL, 0);
+    assert(len == pMultiMeta->rawLen - sizeof(SMultiTableMeta));
+
+    pMsg = buf;
+  }
+
   for (int32_t i = 0; i < pMultiMeta->numOfTables; i++) {
     STableMetaMsg *pMetaMsg = (STableMetaMsg *)pMsg;
     int32_t code = tableMetaMsgConvert(pMetaMsg);
     if (code != TSDB_CODE_SUCCESS) {
       taosHashCleanup(pSet);
       taosReleaseRef(tscObjRef, pParentSql->self);
+
+      tfree(buf);
       return code;
     }
 
@@ -2066,6 +2078,8 @@ int tscProcessMultiTableMetaRsp(SSqlObj *pSql) {
       tscError("0x%"PRIx64" invalid table meta from mnode, name:%s", pSql->self, pMetaMsg->tableFname);
       taosHashCleanup(pSet);
       taosReleaseRef(tscObjRef, pParentSql->self);
+
+      tfree(buf);
       return TSDB_CODE_TSC_INVALID_VALUE;
     }
 
@@ -2115,6 +2129,8 @@ int tscProcessMultiTableMetaRsp(SSqlObj *pSql) {
 
   taosHashCleanup(pSet);
   taosReleaseRef(tscObjRef, pParentSql->self);
+
+  tfree(buf);
   return TSDB_CODE_SUCCESS;
 }
 

src/inc/taosmsg.h

@@ -760,10 +760,12 @@ typedef struct STableMetaMsg {
 } STableMetaMsg;
 
 typedef struct SMultiTableMeta {
-  int32_t       numOfTables;
-  int32_t       numOfVgroup;
-  int32_t       contLen;
-  char          meta[];
+  int32_t  numOfTables;
+  int32_t  numOfVgroup;
+  uint32_t contLen:31;
+  uint8_t  compressed:1;      // denote if compressed or not
+  uint32_t rawLen;            // size before compress
+  char     meta[];
 } SMultiTableMeta;
 
 typedef struct {

src/mnode/src/mnodeTable.c

@@ -2892,7 +2892,7 @@ static SMultiTableMeta* ensureMsgBufferSpace(SMultiTableMeta *pMultiMeta, SArray
       (*totalMallocLen) *= 2;
     }
 
-    pMultiMeta = rpcReallocCont(pMultiMeta, *totalMallocLen);
+    pMultiMeta = realloc(pMultiMeta, *totalMallocLen);
     if (pMultiMeta == NULL) {
       return NULL;
     }
@@ -2923,8 +2923,8 @@ static int32_t mnodeProcessMultiTableMetaMsg(SMnodeMsg *pMsg) {
   }
 
   // first malloc 80KB, subsequent reallocation will expand the size as twice of the original size
-  int32_t totalMallocLen = sizeof(STableMetaMsg) + sizeof(SSchema) * (TSDB_MAX_TAGS + TSDB_MAX_COLUMNS + 16);
-  pMultiMeta = rpcMallocCont(totalMallocLen);
+  int32_t totalMallocLen = sizeof(SMultiTableMeta) + sizeof(STableMetaMsg) + sizeof(SSchema) * (TSDB_MAX_TAGS + TSDB_MAX_COLUMNS + 16);
+  pMultiMeta = calloc(1, totalMallocLen);
   if (pMultiMeta == NULL) {
     code = TSDB_CODE_MND_OUT_OF_MEMORY;
     goto _end;
@@ -2957,7 +2957,7 @@ static int32_t mnodeProcessMultiTableMetaMsg(SMnodeMsg *pMsg) {
     int remain = totalMallocLen - pMultiMeta->contLen;
     if (remain <= sizeof(STableMetaMsg) + sizeof(SSchema) * (TSDB_MAX_TAGS + TSDB_MAX_COLUMNS + 16)) {
       totalMallocLen *= 2;
-      pMultiMeta = rpcReallocCont(pMultiMeta, totalMallocLen);
+      pMultiMeta = realloc(pMultiMeta, totalMallocLen);
       if (pMultiMeta == NULL) {
         mnodeDecTableRef(pMsg->pTable);
         code = TSDB_CODE_MND_OUT_OF_MEMORY;
@@ -3027,16 +3027,36 @@ static int32_t mnodeProcessMultiTableMetaMsg(SMnodeMsg *pMsg) {
   pMsg->rpcRsp.len = pMultiMeta->contLen;
   code = TSDB_CODE_SUCCESS;
 
+  char* tmp = rpcMallocCont(pMultiMeta->contLen + 2);
+  int32_t len = tsCompressString(pMultiMeta->meta, (int32_t)pMultiMeta->contLen - sizeof(SMultiTableMeta), 1,
+      tmp + sizeof(SMultiTableMeta), (int32_t)pMultiMeta->contLen - sizeof(SMultiTableMeta) + 2, ONE_STAGE_COMP, NULL, 0);
+
+  pMultiMeta->rawLen = pMultiMeta->contLen;
+  if (len == -1 || len + sizeof(SMultiTableMeta) >= pMultiMeta->contLen + 2) { // compress failed, do not compress this binary data
+    pMultiMeta->compressed = 0;
+    memcpy(tmp, pMultiMeta, sizeof(SMultiTableMeta) + pMultiMeta->contLen);
+  } else {
+    pMultiMeta->compressed = 1;
+    pMultiMeta->contLen = sizeof(SMultiTableMeta) + len;
+
+    // copy the header and the compressed payload
+    memcpy(tmp, pMultiMeta, sizeof(SMultiTableMeta));
+  }
+
+  pMsg->rpcRsp.rsp = tmp;
+  pMsg->rpcRsp.len = pMultiMeta->contLen;
+
+  SMultiTableMeta* p = (SMultiTableMeta*) tmp;
+
+  mDebug("multiTable info build completed, original:%d, compressed:%d, comp:%d", p->rawLen, p->contLen, p->compressed);
+
   _end:
   tfree(str);
   tfree(nameList);
   taosArrayDestroy(pList);
   pMsg->pTable  = NULL;
   pMsg->pVgroup = NULL;
-
-  if (code != TSDB_CODE_SUCCESS) {
-    rpcFreeCont(pMultiMeta);
-  }
+  tfree(pMultiMeta);
 
   return code;
 }