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https://issues.apache.org/jira/browse/HDFS-13223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388505#comment-16388505
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Hudson commented on HDFS-13223:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13782 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/13782/])
HDFS-13223. Reduce DiffListBySkipList memory usage. Contributed by (szetszwo:
rev 871d0d39faa2c4c992d61ed20497dcf6c3faa376)
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestDiffListBySkipList.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryDiffListFactory.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DiffListBySkipList.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
> 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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