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https://issues.apache.org/jira/browse/HADOOP-15711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16599142#comment-16599142
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Allen Wittenauer commented on HADOOP-15711:
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This is pretty much the continuing story of HDFS-12711 and friends.
But please please please do not increase the process limits on the ASF Jenkins
jobs. Process limits were added to Yetus specifically because the Hadoop unit
tests were crashing Jenkins build nodes.
> Fix branch-2 builds
> -------------------
>
> Key: HADOOP-15711
> URL: https://issues.apache.org/jira/browse/HADOOP-15711
> Project: Hadoop Common
> Issue Type: Task
> Reporter: Jonathan Hung
> Priority: Critical
>
> Branch-2 builds have been disabled for a while:
> https://builds.apache.org/view/H-L/view/Hadoop/job/hadoop-qbt-branch2-java7-linux-x86/
> A test run here causes hdfs tests to hang:
> https://builds.apache.org/view/H-L/view/Hadoop/job/hadoop-qbt-branch2-java7-linux-x86-jhung/4/
> Running hadoop-hdfs tests locally reveal some errors such
> as:{noformat}[ERROR]
> testComplexAppend2(org.apache.hadoop.hdfs.TestFileAppend2) Time elapsed:
> 0.059 s <<< ERROR!
> java.lang.OutOfMemoryError: unable to create new native thread
> at java.lang.Thread.start0(Native Method)
> at java.lang.Thread.start(Thread.java:714)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.saveFSImageInAllDirs(FSImage.java:1164)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.saveFSImageInAllDirs(FSImage.java:1128)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:174)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1172)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:403)
> at
> org.apache.hadoop.hdfs.DFSTestUtil.formatNameNode(DFSTestUtil.java:234)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.createNameNodesAndSetConf(MiniDFSCluster.java:1080)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.initMiniDFSCluster(MiniDFSCluster.java:883)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:514)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster$Builder.build(MiniDFSCluster.java:473)
> at
> org.apache.hadoop.hdfs.TestFileAppend2.testComplexAppend(TestFileAppend2.java:489)
> at
> org.apache.hadoop.hdfs.TestFileAppend2.testComplexAppend2(TestFileAppend2.java:543)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43){noformat}
> I was able to get more tests passing locally by increasing the max user
> process count on my machine. But the error suggests that there's an issue in
> the tests themselves. Not sure if the error seen locally is the same reason
> as why jenkins builds are failing, I wasn't able to confirm based on the
> jenkins builds' lack of output.
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