Mustafa Iman created HIVE-23745:
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Summary: Avoid copying userpayload in task communicator
Key: HIVE-23745
URL: https://issues.apache.org/jira/browse/HIVE-23745
Project: Hive
Issue Type: Sub-task
Reporter: Mustafa Iman
Assignee: Mustafa Iman
[https://github.com/apache/hive/blob/master/llap-common/src/java/org/apache/hadoop/hive/llap/tez/Converters.java#L182]
I see this copy take a few milliseconds sometimes. Delay here adds up for all
tasks of a single vertex in LlapTaskCommunicator as it processes tasks one by
one. User payload never changes in this codepath. Copy is made because of
limitations of Protobuf library. Protobuf adds a UnsafeByteOperations class
that avoid copying of ByteBuffers in 3.1 version. This can be resolved when
Protobuf is upgraded.
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