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https://issues.apache.org/jira/browse/HDFS-13173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384429#comment-16384429
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Hudson commented on HDFS-13173:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13764 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/13764/])
HDFS-13173.  Replace ArrayList with DirectoryDiffList(SnapshotSkipList) 
(szetszwo: rev ba82e5c488ca0081534c1e40810b3f9e7da9eaad)
* (edit) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/AbstractINodeDiffList.java
* (add) 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestDiffListBySkipList.java
* (delete) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryDiffList.java
* (edit) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* (delete) 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestDirectoryDiffList.java
* (add) 
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/DirectoryWithSnapshotFeature.java
* (edit) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* (add) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryDiffListFactory.java


> Replace ArrayList with DirectoryDiffList(SnapshotSkipList) to store 
> DirectoryDiffs
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-13173
>                 URL: https://issues.apache.org/jira/browse/HDFS-13173
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: snapshots
>            Reporter: Shashikant Banerjee
>            Assignee: Shashikant Banerjee
>            Priority: Major
>             Fix For: 3.2.0
>
>         Attachments: HDFS-13173.001.patch, HDFS-13173.002.patch, 
> HDFS-13173.003.patch
>
>
> This Jira will replace the existing ArrayList with DirectoryDiffList to store 
> directory diffs for snapshots based on the config value of maxSkipLevels. If 
> the config specified is set to greater than 0, SnapshotSkipList will be used 
> to store DirectoryDiffs  else ArrayList will be used. The config value is set 
> to 0 by default.



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