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https://issues.apache.org/jira/browse/IMPALA-12171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Csaba Ringhofer updated IMPALA-12171:
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Description:
Delimited output is much faster then pretty printing, but can still be the
bottleneck when printing large result sets (50-80% of CPU time in impala-shell).
Was able to significantly improve performance by adding custom CSV writer to
DelimitedOutputFormatter:
https://gerrit.cloudera.org/#/c/19894/
was:
Delimited output is much faster then pretty printing, but can still be the
bottleneck when printing large result sets (50-80% of CPU time in impala-shell).
Was able to significantly improve performance by rewriting adding custom CSV
writer to DelimitedOutputFormatter:
https://gerrit.cloudera.org/#/c/19894/
> Slow CSV output in Impala-shell
> -------------------------------
>
> Key: IMPALA-12171
> URL: https://issues.apache.org/jira/browse/IMPALA-12171
> Project: IMPALA
> Issue Type: Improvement
> Components: Clients
> Reporter: Csaba Ringhofer
> Priority: Major
>
> Delimited output is much faster then pretty printing, but can still be the
> bottleneck when printing large result sets (50-80% of CPU time in
> impala-shell).
> Was able to significantly improve performance by adding custom CSV writer to
> DelimitedOutputFormatter:
> https://gerrit.cloudera.org/#/c/19894/
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