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https://issues.apache.org/jira/browse/IMPALA-13509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-13509.
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Fix Version/s: Impala 4.5.0
Resolution: Fixed
> Avoid duplicate deepcopy during hash partitioning in KrpcDataStreamSender
> -------------------------------------------------------------------------
>
> Key: IMPALA-13509
> URL: https://issues.apache.org/jira/browse/IMPALA-13509
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Csaba Ringhofer
> Assignee: Csaba Ringhofer
> Priority: Critical
> Labels: performance
> Fix For: Impala 4.5.0
>
>
> Currently all rows are deep copied twice:
> 1. to the RowBatch of the given channel
> 2. to an OutboundRowBatch when the collector RowBatch is at capacity
> Copying directly to an OutboundRowBatch could avoid some CPU work.
> The would also allow easier implementation of the following improvements:
> - deduplicate tuples similarly to broadcast/unpartitioned exchange
> (IMPALA-13225).
> - keep outbound row batch size below data_stream_sender_buffer_size even for
> var len data
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