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From sandhyasun <...@git.apache.org>
Subject [GitHub] incubator-trafodion pull request #889: [TRAFODION-2408] Changes to support "...
Date Tue, 03 Jan 2017 19:00:13 GMT
Github user sandhyasun commented on a diff in the pull request:

    https://github.com/apache/incubator-trafodion/pull/889#discussion_r94461709
  
    --- Diff: core/sql/exp/ExpLOBaccess.cpp ---
    @@ -1502,7 +1507,50 @@ Ex_Lob_Error ExLob::allocateDesc(ULng32 size, Int64 &descNum,
Int64 &dataOffset,
         char logBuf[4096];
         lobDebugInfo("In ExLob::allocateDesc",0,__LINE__,lobTrace_);
         Int32 openFlags = O_RDONLY ;   
    -    
    +    if (size == 0) //we are trying to empty this lob.
    +      {
    +        //rename lob datafile
    +        char * saveLobDataFile = new(getLobGlobalHeap()) char[MAX_LOB_FILE_NAME_LEN+6];
    +        str_sprintf(saveLobDataFile, "%s_save",lobDataFile_);
    +        Int32 rc2 = hdfsRename(fs_,lobDataFile_,saveLobDataFile);
    +        if (rc2 == -1)
    +          {
    +            lobDebugInfo("Problem renaming datafile to save data file",0,__LINE__,lobTrace_);
    +            NADELETEBASIC(saveLobDataFile,getLobGlobalHeap());
    +            return LOB_DATA_FILE_WRITE_ERROR;
    +          }
    +        //create a new file of the same name.
    +        hdfsFile fdNew = hdfsOpenFile(fs_, lobDataFile_,O_WRONLY|O_CREAT,0,0,0);
    +        if (!fdNew) 
    +          {
    +            str_sprintf(logBuf,"Could not create/open file:%s",lobDataFile_);
    +            lobDebugInfo(logBuf,0,__LINE__,lobTrace_);
    +            
    +            //restore previous version
    +            Int32 rc2 = hdfsRename(fs_,saveLobDataFile,lobDataFile_);
    +              if (rc2 == -1)
    +                {
    +                  lobDebugInfo("Problem restoring datafile . Will need to retry the update",0,__LINE__,lobTrace_);
    +                  NADELETEBASIC(saveLobDataFile,getLobGlobalHeap());
    +                  return LOB_DATA_FILE_WRITE_ERROR;
    +                }
    +            return LOB_DATA_FILE_OPEN_ERROR;
    --- End diff --
    
    its deleted below in the "else" part 
     else
              {
                //A new empty data file has been created.
                // delete the saved data file
                Int32 rc2 = hdfsDelete(fs_,saveLobDataFile,FALSE);//ok to ignore error.nt32
           
                if (rc2 == -1)
                  {
                    lobDebugInfo("Problem deleting saved datafile . Will need to manually
cleanup saved datafile",0,__LINE__,lobTrace_);
                  }
                NADELETEBASIC(saveLobDataFile,getLobGlobalHeap());
                hdfsCloseFile(fs_,fdNew);
                fdNew = NULL;    
              }


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