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https://issues.apache.org/jira/browse/HDFS-12171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HDFS-12171:
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Attachment: HDFS-12171.branch-2.patch
HDFS-12171.patch
Only difference is trunk patch includes EC change.
> Reduce IIP object allocations for inode lookup
> ----------------------------------------------
>
> Key: HDFS-12171
> URL: https://issues.apache.org/jira/browse/HDFS-12171
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-12171.branch-2.patch, HDFS-12171.patch
>
>
> {{IIP#getReadOnlyINodes}} is invoked frequently for EZ and EC lookups. It
> allocates unnecessary objects to make the primitive array an immutable array
> list. IIP already has a method for indexed inode retrieval that can be
> tweaked to further improve performance.
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