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https://issues.apache.org/jira/browse/YARN-3469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod Kumar Vavilapalli updated YARN-3469:
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Fix Version/s: (was: 2.8.0)
2.7.1
Pulled this into 2.7 and (1) it seems useful for production clusters and (2)
YARN-3385 got conflicts on 2.7 branch without this patch.
> ZKRMStateStore: Avoid setting watches that are not required
> -----------------------------------------------------------
>
> Key: YARN-3469
> URL: https://issues.apache.org/jira/browse/YARN-3469
> Project: Hadoop YARN
> Issue Type: Improvement
> Affects Versions: 2.6.0
> Reporter: Jun Gong
> Assignee: Jun Gong
> Priority: Minor
> Fix For: 2.7.1
>
> Attachments: YARN-3469.01.patch
>
>
> In ZKRMStateStore, most operations(e.g. getDataWithRetries,
> getDataWithRetries, getDataWithRetries) set watches on znode. Large watches
> will cause problem such as [ZOOKEEPER-706: large numbers of watches can cause
> session re-establishment to
> fail|https://issues.apache.org/jira/browse/ZOOKEEPER-706].
> Although there is a workaround that setting jute.maxbuffer to a larger value,
> we need to adjust this value once there are more app and attempts stored in
> ZK. And those watches are useless now. It might be better that do not set
> watches.
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