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https://issues.apache.org/jira/browse/HDFS-9599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427406#comment-15427406
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Mingliang Liu commented on HDFS-9599:
-------------------------------------
The test is still failing sometimes. See
https://builds.apache.org/job/PreCommit-HDFS-Build/16473/testReport/ for
example. Don't know whether it's a different issue.
> TestDecommissioningStatus.testDecommissionStatus occasionally fails
> -------------------------------------------------------------------
>
> Key: HDFS-9599
> URL: https://issues.apache.org/jira/browse/HDFS-9599
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Environment: Jenkins
> Reporter: Wei-Chiu Chuang
> Assignee: Yiqun Lin
> Fix For: 2.8.0
>
> Attachments: HDFS-9599.001.patch, HDFS-9599.002.patch
>
>
> From test result of a recent jenkins nightly
> https://builds.apache.org/job/Hadoop-Hdfs-trunk/2663/testReport/junit/org.apache.hadoop.hdfs.server.namenode/TestDecommissioningStatus/testDecommissionStatus/
> The test failed because the number of under replicated blocks is 4, instead
> of 3.
> Looking at the log, there is a strayed block, which might have caused the
> faillure:
> {noformat}
> 2015-12-23 00:42:05,820 [Block report processor] INFO BlockStateChange
> (BlockManager.java:processReport(2131)) - BLOCK* processReport:
> blk_1073741825_1001 on node 127.0.0.1:57382 size 16384 does not belong to any
> file
> {noformat}
> The block size 16384 suggests this is left over from the sibling test case
> testDecommissionStatusAfterDNRestart. This can happen, because the same
> minidfs cluster is reused between tests.
> The test implementation should do a better job isolating tests.
> Another case of failure is when the load factor comes into play, and a block
> can not find sufficient data nodes to place replica. In this test, the
> runtime should not consider load factor:
> {noformat}
> conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_REPLICATION_CONSIDERLOAD_KEY,
> false);
> {noformat}
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