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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7433) Optimize performance of DatanodeManager's node map
Date Sat, 09 May 2015 11:58:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14536385#comment-14536385
] 

Hudson commented on HDFS-7433:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk-Java8 #191 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/191/])
HDFS-7433. Optimize performance of DatanodeManager's node map. Contributed by Daryn Sharp.
(kihwal: rev 7a7960be41c32f20ffec9fea811878b113da62db)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> Optimize performance of DatanodeManager's node map
> --------------------------------------------------
>
>                 Key: HDFS-7433
>                 URL: https://issues.apache.org/jira/browse/HDFS-7433
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>              Labels: BB2015-05-TBR
>             Fix For: 2.8.0
>
>         Attachments: HDFS-7433.patch, HDFS-7433.patch, HDFS-7433.patch, HDFS-7433.patch
>
>
> The datanode map is currently a {{TreeMap}}.  For many thousands of datanodes, tree lookups
are ~10X more expensive than a {{HashMap}}.  Insertions and removals are up to 100X more expensive.



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