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https://issues.apache.org/jira/browse/IMPALA-5119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Ho reassigned IMPALA-5119:
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Assignee: (was: Dan Hecht)
> Don't make RPCs from Coordinator::UpdateBackendExecStatus()
> -----------------------------------------------------------
>
> Key: IMPALA-5119
> URL: https://issues.apache.org/jira/browse/IMPALA-5119
> Project: IMPALA
> Issue Type: Sub-task
> Components: Distributed Exec
> Affects Versions: Impala 2.9.0
> Reporter: Henry Robinson
> Priority: Major
>
> If it reports a bad status, {{UpdateFragmentExecStatus()}} will call
> {{UpdateStatus()}}, which takes {{Coordinator::lock_}} and then calls
> {{Cancel()}}. That method issues one RPC per fragment instance.
> In KRPC, doing so much work from {{UpdateFragmentExecStatus()}} - which is an
> RPC handler - is a bad idea, even if the RPCs are issued asynchronously.
> There's still some serialization cost.
> It's also a bad idea to do all this work while holding {{lock_}}. We should
> address both of these to ensure scalability of the cancellation path.
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