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https://issues.apache.org/jira/browse/HDFS-2553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171856#comment-13171856
]
Hudson commented on HDFS-2553:
------------------------------
Integrated in Hadoop-Hdfs-0.23-Build #111 (See
[https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/111/])
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=1220316
Files :
*
/hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/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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