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https://issues.apache.org/jira/browse/IMPALA-14855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-14855 started by Michael Smith.
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> Make the number of shards in the ShardedQueryMap configurable
> -------------------------------------------------------------
>
> Key: IMPALA-14855
> URL: https://issues.apache.org/jira/browse/IMPALA-14855
> Project: IMPALA
> Issue Type: Task
> Components: Backend
> Affects Versions: Impala 5.0.0
> Reporter: Joe McDonnell
> Assignee: Michael Smith
> Priority: Major
>
> ShardedQueryMap currently uses a hard coded NUM_QUERY_BUCKETS (4) for the
> number of shards. In some clusters, we have seen cases where there is
> contention on the shard's lock. It would be useful to be able to tune this at
> startup.
> A different problem is that something can do expensive computation or take
> other locks while holding the shard's lock (e.g. DoFuncForAllEntries). That
> will need to be addressed separately.
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