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https://issues.apache.org/jira/browse/IMPALA-10180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17721868#comment-17721868
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David Rorke commented on IMPALA-10180:
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Some summary latency metrics could also be useful here. Ideally some
histogram/percentile metrics on the delays between individual client fetch
requests. This would help identify cases of variable/transient client or
network slowness.
> Add average size of fetch requests in runtime profile
> -----------------------------------------------------
>
> Key: IMPALA-10180
> URL: https://issues.apache.org/jira/browse/IMPALA-10180
> Project: IMPALA
> Issue Type: Improvement
> Components: Clients
> Reporter: Sahil Takiar
> Priority: Major
>
> When queries with a high {{ClientFetchWaitTimer}} it would be useful to know
> the average number of rows requested by the client per fetch request. This
> can help determine if setting a higher fetch size would help improve fetch
> performance where the network RTT between the client and Impala is high.
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