[jira] [Created] (HUDI-1509) Major performance degradation due to rewriting records with default values

["Prashant Wason (Jira)" <ji...@apache.org>]

Prashant Wason created HUDI-1509:
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             Summary: Major performance degradation due to rewriting records with default values
                 Key: HUDI-1509
                 URL: https://issues.apache.org/jira/browse/HUDI-1509
             Project: Apache Hudi
          Issue Type: Bug
            Reporter: Prashant Wason


During the in-house testing for 0.5x to 0.6x release upgrade, I have detected a performance degradation for writes into HUDI. I have traced the issue due to the changes in the following commit

[[HUDI-727]: Copy default values of fields if not present when rewriting incoming record with new schema|https://github.com/apache/hudi/commit/6d7ca2cf7e441ad19d32d7a25739e454f39ed253]

I wrote a unit test to reduce the scope of testing as follows:
# Take an existing parquet file from production dataset (size=690MB, #records=960K)
# Read all the records from this parquet into a JavaRDD
# Time the call HoodieWriteClient.bulkInsertPrepped(). (bulkInsertParallelism=1)

The above scenario is directly taken from our production pipelines where each executor will ingest about a million record creating a single parquet file in a COW dataset. This is bulk insert only dataset.

The time to complete the bulk insert prepped *decreased from 680seconds to 380seconds* when I reverted the above commit. 




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