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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3087) Decomissioning on NN restart can complete without blocks being replicated
Date Wed, 08 Apr 2015 23:30:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486323#comment-14486323
] 

Hudson commented on HDFS-3087:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #7540 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/7540/])
HDFS-8025. Addendum fix for HDFS-3087 Decomissioning on NN restart can complete without blocks
being replicated. Contributed by Ming Ma. (wang: rev 5a540c3d3107199f4632e2ad7ee8ff913b107a04)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommission.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java


> Decomissioning on NN restart can complete without blocks being replicated
> -------------------------------------------------------------------------
>
>                 Key: HDFS-3087
>                 URL: https://issues.apache.org/jira/browse/HDFS-3087
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 0.23.0
>            Reporter: Kihwal Lee
>            Assignee: Rushabh S Shah
>            Priority: Critical
>             Fix For: 2.5.0
>
>         Attachments: HDFS-3087.patch
>
>
> If a data node is added to the exclude list and the name node is restarted, the decomissioning
happens right away on the data node registration. At this point the initial block report has
not been sent, so the name node thinks the node has zero blocks and the decomissioning completes
very quick, without replicating the blocks on that node.



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