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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