[GitHub] [hudi] nsivabalan commented on issue #4929: [SUPPORT] SparkSession To Hudi Small files are not merged

[GitBox <gi...@apache.org>]

nsivabalan commented on issue #4929:
URL: https://github.com/apache/hudi/issues/4929#issuecomment-1057470031


   I assume all files seen in snapshot are written in one commit. and not across diff commits. 
   and I guess its the first commit you are making to the hudi table.
   if thats the case, may be you need to set the right value for 
   https://hudi.apache.org/docs/configurations/#hoodiecopyonwriterecordsizeestimate 
   
   If you are not sure of your record size, you can check the commit metadata of already committed file.
   
   ```
   ls -ltr /tmp/hudi_trips_cow/.hoodie/
   total 32
   drwxr-xr-x  2 nsb  wheel    64 Mar  2 10:08 archived
   -rw-r--r--  1 nsb  wheel   600 Mar  2 10:08 hoodie.properties
   -rw-r--r--  1 nsb  wheel     0 Mar  2 10:08 20220302100851024.commit.requested
   -rw-r--r--  1 nsb  wheel  2594 Mar  2 10:08 20220302100851024.inflight
   -rw-r--r--  1 nsb  wheel  4428 Mar  2 10:08 20220302100851024.commit
   ```
   ```
   cat /tmp/hudi_trips_cow/.hoodie/20220302100851024.commit
   {
     "partitionToWriteStats" : {
       "americas/brazil/sao_paulo" : [ {
         "fileId" : "12a03b4e-e371-4586-913e-fa496332a982-0",
         "path" : "americas/brazil/sao_paulo/12a03b4e-e371-4586-913e-fa496332a982-0_0-28-33_20220302100851024.parquet",
         "prevCommit" : "null",
         "numWrites" : 1,
         "numDeletes" : 0,
         "numUpdateWrites" : 0,
         "numInserts" : 1,
         "totalWriteBytes" : 437642,
         "totalWriteErrors" : 0,
         "tempPath" : null,
         "partitionPath" : "americas/brazil/sao_paulo",
         "totalLogRecords" : 0,
         "totalLogFilesCompacted" : 0,
         "totalLogSizeCompacted" : 0,
         "totalUpdatedRecordsCompacted" : 0,
         "totalLogBlocks" : 0,
         "totalCorruptLogBlock" : 0,
         "totalRollbackBlocks" : 0,
         "fileSizeInBytes" : 437642,
         "minEventTime" : null,
         "maxEventTime" : null
       } ],
       "americas/united_states/san_francisco" : [ {
         "fileId" : "bfb3b7ac-e484-4264-b4f0-51d3154de619-0",
         "path" : "americas/united_states/san_francisco/bfb3b7ac-e484-4264-b4f0-51d3154de619-0_1-34-34_20220302100851024.parquet",
   .
   .
   ```
   
   you can calculate using numWrites and fileSizeInBytes. 
   
   
   


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