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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13223) Reduce DiffListBySkipList memory usage
Date Tue, 06 Mar 2018 20:25:00 GMT

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

Tsz Wo Nicholas Sze updated HDFS-13223:
---------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.2.0
           Status: Resolved  (was: Patch Available)

I have committed this.  Thanks, Shashi!

> 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
>             Fix For: 3.2.0
>
>         Attachments: HDFS-13223.001.patch, HDFS-13223.002.patch, HDFS-13223.003.patch,
HDFS-13223.004.patch, HDFS-13223.004_commit.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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