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https://issues.apache.org/jira/browse/HDFS-13223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385998#comment-16385998
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Shashikant Banerjee commented on HDFS-13223:
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patch v2 fixes the checkstyle issues.
> Reduce DiffListBySkipList memory usage
> --------------------------------------
>
> Key: HDFS-13223
> URL: https://issues.apache.org/jira/browse/HDFS-13223
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: snapshots
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Shashikant Banerjee
> Priority: Major
> Attachments: HDFS-13223.001.patch, HDFS-13223.002.patch
>
>
> There are several ways to reduce memory footprint of DiffListBySkipList.
> - Move maxSkipLevels and skipInterval to DirectoryDiffListFactory.
> - Use an array for skipDiffList instead of List.
> - Do not store the level 0 element in skipDiffList.
> - Do not create new ChildrenDiff for the same value.
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