[jira] [Updated] (HDFS-13223) Reduce DiffListBySkipList memory usage

["Shashikant Banerjee (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-13223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shashikant Banerjee updated HDFS-13223:
---------------------------------------
    Attachment: HDFS-13223.001.patch

> 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
>
>
> 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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