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https://issues.apache.org/jira/browse/IMPALA-9716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Tauber-Marshall resolved IMPALA-9716.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Add jitter to the exponential backoff in status reporting
> ---------------------------------------------------------
>
> Key: IMPALA-9716
> URL: https://issues.apache.org/jira/browse/IMPALA-9716
> Project: IMPALA
> Issue Type: Improvement
> Components: Distributed Exec
> Affects Versions: Impala 4.0
> Reporter: Thomas Tauber-Marshall
> Assignee: Thomas Tauber-Marshall
> Priority: Major
> Fix For: Impala 4.0
>
>
> When status reports fail, we use exponential backoff when retrying sending
> them. However, currently the backoff is deterministic, leading to a
> thundering herd problem where all of the backends for a particular query may
> try to report at the same time, the coordinator is overwhelmed and rejects
> some of the rpcs, then the backends all backoff by the same amount and retry
> sending at the same time, leading the coordinator to be overwhelmed again.
> We can help solve this by adding some random jitter to the exponential
> backoff time.
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