[
https://issues.apache.org/jira/browse/HDFS-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12770153#action_12770153
]
Hudson commented on HDFS-723:
-----------------------------
Integrated in Hadoop-Hdfs-trunk-Commit #84 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk-Commit/84/])
Move the change log of from section 0.21 to section 0.20.2
> Deadlock in DFSClient#DFSOutputStream
> -------------------------------------
>
> Key: HDFS-723
> URL: https://issues.apache.org/jira/browse/HDFS-723
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.21.0
>
> Attachments: deadlock.patch
>
>
> WhiIe was running some append-related tests, I hit this deadlock:
> {noformat}
> Found one Java-level deadlock:
> =============================
> "Thread-3":
> waiting to lock monitor 0x000000012ee044f0 (object 0x0000000107a0ded0, a
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream),
> which is held by "main"
> "main":
> waiting to lock monitor 0x000000012eeb71a8 (object 0x00000001082b0748, a
> org.apache.hadoop.hdfs.DFSClient$LeaseChecker),
> which is held by "Thread-3"
> Java stack information for the threads listed above:
> ===================================================
> "Thread-3":
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.close(DFSClient.java:3582)
> - waiting to lock <0x0000000107a0ded0> (a
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream)
> at
> org.apache.hadoop.hdfs.DFSClient$LeaseChecker.close(DFSClient.java:1175)
> - locked <0x00000001082b0748> (a
> org.apache.hadoop.hdfs.DFSClient$LeaseChecker)
> at org.apache.hadoop.hdfs.DFSClient.close(DFSClient.java:306)
> - locked <0x000000010824d640> (a org.apache.hadoop.hdfs.DFSClient)
> - waiting to lock <0x0000000107a0ded0> (a
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream)
> at
> org.apache.hadoop.hdfs.DFSClient$LeaseChecker.close(DFSClient.java:1175)
> - locked <0x00000001082b0748> (a
> org.apache.hadoop.hdfs.DFSClient$LeaseChecker)
> at org.apache.hadoop.hdfs.DFSClient.close(DFSClient.java:306)
> - locked <0x000000010824d640> (a org.apache.hadoop.hdfs.DFSClient)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.close(DistributedFileSystem.java:325)
> at
> org.apache.hadoop.fs.FileSystem$Cache.closeAll(FileSystem.java:1835)
> - locked <0x0000000107a77ec8> (a
> org.apache.hadoop.fs.FileSystem$Cache)
> at
> org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer.run(FileSystem.java:1851)
> - locked <0x00000001079daa00> (a
> org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer)
> "main":
> at
> org.apache.hadoop.hdfs.DFSClient$LeaseChecker.remove(DFSClient.java:1151)
> - waiting to lock <0x00000001082b0748> (a
> org.apache.hadoop.hdfs.DFSClient$LeaseChecker)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.close(DFSClient.java:3609)
> - locked <0x0000000107a0ded0> (a
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream)
> at
> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:61)
> at
> org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:86)
> at
> org.apache.hadoop.hdfs.TestFileAppend4.testAppend(TestFileAppend4.java:99)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at junit.framework.TestCase.runTest(TestCase.java:168)
> at junit.framework.TestCase.runBare(TestCase.java:134)
> at junit.framework.TestResult$1.protect(TestResult.java:110)
> at junit.framework.TestResult.runProtected(TestResult.java:128)
> at junit.framework.TestResult.run(TestResult.java:113)
> at junit.framework.TestCase.run(TestCase.java:124)
> at junit.framework.TestSuite.runTest(TestSuite.java:232)
> at junit.framework.TestSuite.run(TestSuite.java:227)
> at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
> at junit.extensions.TestSetup$1.protect(TestSetup.java:23)
> at junit.framework.TestResult.runProtected(TestResult.java:128)
> at junit.extensions.TestSetup.run(TestSetup.java:27)
> at
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:420)
> at
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:911)
> at
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:768)
> {noformat}
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