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https://issues.apache.org/jira/browse/HDDS-5472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17385402#comment-17385402
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Attila Doroszlai commented on HDDS-5472:
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[~Symious], can you please add steps to reproduce the problem (i.e. create keys
with multiple versions)? (It might be trivial for you, but makes it easier for
others to verify the fix.)
> Old versions of location in OmKeyLocationInfoGroup causes OOM of OM
> -------------------------------------------------------------------
>
> Key: HDDS-5472
> URL: https://issues.apache.org/jira/browse/HDDS-5472
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Janus Chow
> Assignee: Janus Chow
> Priority: Major
> Labels: pull-request-available
>
> Currently the keyLocation of different versions is stored redundantly in
> OmKeyInfo.
> * OmKeyInfo:
> ** keyLocationVersions: List<OmKeyLocationInfoGroup> stores different
> versions of information in a list.
> * OmKeyLocationInfoGroup:
> ** locationVersionMap: Map<Long, List<OmKeyLocationInfo>> stores different
> versions of location in a map.
> If the versions are large, the redundent location is causing the large GC
> overhead for OM, in our cluster, the OM even crashes because of OOM.
> This ticket is to remove the redundant location information to keep OM
> healthy.
> Attached the OmKeyInfo of a key with 549 versions.
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