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https://issues.apache.org/jira/browse/HDDS-16255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-16255:
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Labels: pull-request-available (was: )
> Avoid the per-group list copy in ContainerMapper.parseOmDB
> ----------------------------------------------------------
>
> Key: HDDS-16255
> URL: https://issues.apache.org/jira/browse/HDDS-16255
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Meng-Shuan Tsai
> Assignee: Meng-Shuan Tsai
> Priority: Major
> Labels: pull-request-available
>
> ContainerMapper.parseOmDB iterates every OmKeyLocationInfoGroup of every key
> in the DEFAULT/non-FSO keyTable and calls createLocationList() on each, only
> to walk the resulting List once with a for-each and read getBlockID() from
> each entry:
> {code:java}
> for (OmKeyLocationInfoGroup keyLocationInfoGroup :
> keyInfo.getKeyLocationVersions()) {
> List<OmKeyLocationInfo> keyLocationInfo = keyLocationInfoGroup
> .createLocationList();
> for (OmKeyLocationInfo keyLocation : keyLocationInfo) {
> ...
> }
> }
> {code}
> createLocationList() is documented as not O(1); it flatten-copies each
> group's locationVersionMap into a throwaway List. The call site scans its
> selected keyTable without a per-call batching limit; the aggregate allocation
> impact relative to other callers requires measurement.
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