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https://issues.apache.org/jira/browse/HIVE-21400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16787261#comment-16787261
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Prasanth Jayachandran commented on HIVE-21400:
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lgtm, +1
> Vectorization: LazyBinarySerializeWrite allocates Field() within the loop
> -------------------------------------------------------------------------
>
> Key: HIVE-21400
> URL: https://issues.apache.org/jira/browse/HIVE-21400
> Project: Hive
> Issue Type: Bug
> Components: Vectorization
> Affects Versions: 4.0.0
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Major
> Attachments: HIVE-21400.1.patch
>
>
> GC thrash from an unexpected source in ReduceSinkOperator.
> {code}
> org.apache.hadoop.hive.serde2.lazybinary.fast.LazyBinarySerializeWrite.resetWithoutOutput(LazyBinarySerializeWrite.java:136)
> at
> org.apache.hadoop.hive.serde2.lazybinary.fast.LazyBinarySerializeWrite.reset(LazyBinarySerializeWrite.java:132)
> at
> org.apache.hadoop.hive.ql.exec.vector.reducesink.VectorReduceSinkUniformHashOperator.process(VectorReduceSinkUniformHashOperator.java:180)
> {code}
> GC space is getting thrashed by the
> {code}
> root = new Field(STRUCT);
> {code}
> for every row.
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