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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2553) BlockPoolSliceScanner spinning in loop
Date Sun, 18 Dec 2011 13:42:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171870#comment-13171870
] 

Hudson commented on HDFS-2553:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #931 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/931/])
    HDFS-2553. Fix BlockPoolSliceScanner spinning in a tight loop. Contributed by Uma Maheswara
Rao G.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1220317
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolSliceScanner.java

                
> BlockPoolSliceScanner spinning in loop
> --------------------------------------
>
>                 Key: HDFS-2553
>                 URL: https://issues.apache.org/jira/browse/HDFS-2553
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Uma Maheswara Rao G
>            Priority: Critical
>             Fix For: 0.24.0, 0.23.1
>
>         Attachments: CPUUsage.jpg, HDFS-2553.patch, HDFS-2553.patch
>
>
> Playing with trunk, I managed to get a DataNode in a situation where the BlockPoolSliceScanner
is spinning in the following loop, using 100% CPU:
>         at org.apache.hadoop.hdfs.server.datanode.DataNode$BPOfferService.isAlive(DataNode.java:820)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.isBPServiceAlive(DataNode.java:2962)
>         at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner.scan(BlockPoolSliceScanner.java:625)
>         at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner.scanBlockPoolSlice(BlockPoolSliceScanner.java:614)
>         at org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.run(DataBlockScanner.java:95)

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