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https://issues.apache.org/jira/browse/ACCUMULO-4341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15327734#comment-15327734
]
Josh Elser commented on ACCUMULO-4341:
--------------------------------------
[~ctubbsii], FYI.
If we don't figure out what is broken here before 1.8.0, I'm going to recommend
that we need to very publicly state that HDFS classloading is not a supported
feature for 1.8.0. I really don't want to send someone down a rabbit hole to
find out that this doesn't work.
> ServiceLoader deadlock with classes loaded from HDFS
> ----------------------------------------------------
>
> Key: ACCUMULO-4341
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4341
> Project: Accumulo
> Issue Type: Bug
> Components: client
> Affects Versions: 1.8.0
> Reporter: Dave Marion
>
> With Accumulo set up to use general.vfs.classpaths to load classes from HDFS,
> running `accumulo help` will hang.
> A jstack of the process shows the IPC Client thread at:
> {noformat}
> java.lang.Thread.State: BLOCKED (on object monitor)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:348)
> at
> org.apache.hadoop.conf.Configuration.getClassByNameOrNull(Configuration.java:2051)
> at
> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:91)
> at
> org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75)
> at
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
> at
> org.apache.hadoop.ipc.Client$Connection.receiveRpcResponse(Client.java:1086)
> at org.apache.hadoop.ipc.Client$Connection.run(Client.java:966)
> {noformat}
> and the main thread at:
> {noformat}
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:502)
> at org.apache.hadoop.ipc.Client.call(Client.java:1454)
> - locked <0x00000000f09a2898> (a org.apache.hadoop.ipc.Client$Call)
> at org.apache.hadoop.ipc.Client.call(Client.java:1399)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232)
> at com.sun.proxy.$Proxy9.getFileInfo(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:752)
> at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
> at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)
> at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1982)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:1128)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:1124)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1124)
> at
> org.apache.commons.vfs2.provider.hdfs.HdfsFileObject.doAttach(HdfsFileObject.java:85)
> at
> org.apache.commons.vfs2.provider.AbstractFileObject.attach(AbstractFileObject.java:173)
> - locked <0x00000000f57fd008> (a
> org.apache.commons.vfs2.provider.hdfs.HdfsFileSystem)
> at
> org.apache.commons.vfs2.provider.AbstractFileObject.getContent(AbstractFileObject.java:1236)
> - locked <0x00000000f57fd008> (a
> org.apache.commons.vfs2.provider.hdfs.HdfsFileSystem)
> at
> org.apache.commons.vfs2.impl.VFSClassLoader.getPermissions(VFSClassLoader.java:300)
> at
> java.security.SecureClassLoader.getProtectionDomain(SecureClassLoader.java:206)
> - locked <0x00000000f5ad9138> (a java.util.HashMap)
> at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
> at
> org.apache.commons.vfs2.impl.VFSClassLoader.defineClass(VFSClassLoader.java:226)
> at
> org.apache.commons.vfs2.impl.VFSClassLoader.findClass(VFSClassLoader.java:180)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> - locked <0x00000000f5af3b88> (a
> org.apache.commons.vfs2.impl.VFSClassLoader)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
> - locked <0x00000000f6f5c2f8> (a
> org.apache.commons.vfs2.impl.VFSClassLoader)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:348)
> at
> java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:370)
> at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
> at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
> at org.apache.accumulo.start.Main.checkDuplicates(Main.java:196)
> at org.apache.accumulo.start.Main.getExecutables(Main.java:188)
> at org.apache.accumulo.start.Main.main(Main.java:52)
> {noformat}
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