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https://issues.apache.org/jira/browse/IMPALA-9295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sahil Takiar resolved IMPALA-9295.
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Fix Version/s: Impala 3.4.0
Resolution: Fixed
> RPC failures don't always trigger a blacklist
> ---------------------------------------------
>
> Key: IMPALA-9295
> URL: https://issues.apache.org/jira/browse/IMPALA-9295
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Sahil Takiar
> Assignee: Sahil Takiar
> Priority: Major
> Fix For: Impala 3.4.0
>
>
> There is a race condition in IMPALA-9137. It is possible for the
> aux_error_info and the failure status to arrive in separate exec status
> reports.
> IMPALA-9137 added AuxErrorInfoPB to FragmentInstanceExecStatusPB (contains
> per-fragment info for a ReportExecStatusRequestPB). The idea is that if a
> query fails, the Coordinator would use the AuxErrorInfoPB to potentially
> blacklist any nodes that caused the failure. The Coordinator only looks for
> AuxErrorInfoPB if the query has failed (e.g. if
> ReportExecStatusRequestPB::overall_status is set to an error).
> The issue is that is is possible that the AuxErrorInfoPB is set even though
> overall_status == OK. There is a race condition on the executor side where
> the setting of the aux_error_info and and overall_status is not synchronized.
> So if a fragment fails due to an RPC error, it is possible for report number
> "x" to include the aux_error_info with overall_status == OK, and report
> number "x + 1" to include no aux_error_info with overall_status ==
> [some-RPC-failure-message].
> Report num "x +1" won't include the aux_error_info since the fragment has
> finished and its last FragmentInstanceExecStatusPB was in report num "x".
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