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Posted to common-dev@hadoop.apache.org by "lohit vijayarenu (JIRA)" <ji...@apache.org> on 2008/05/06 10:45:56 UTC
[jira] Commented: (HADOOP-3348) TestUrlStreamHandler hangs on LINUX
[ https://issues.apache.org/jira/browse/HADOOP-3348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594521#action_12594521 ]
lohit vijayarenu commented on HADOOP-3348:
------------------------------------------
After running a few times, I see that SecureRandom.getInstance("SHA1PRNG").nextInt(Integer.MAX_VALUE) seem to hang when setURLStreamHandlerFactor(factory) is set. main thread as seen from the stack trace seem to hang on readBytes on file descriptor /dev/random strace. I see that this test runs to completion 1 out of 5-6 times tough. And also calling setURLStreamingHandlerFactory after MiniDFSCluster is up works fine.
> TestUrlStreamHandler hangs on LINUX
> -----------------------------------
>
> Key: HADOOP-3348
> URL: https://issues.apache.org/jira/browse/HADOOP-3348
> Project: Hadoop Core
> Issue Type: Bug
> Components: fs
> Affects Versions: 0.18.0
> Environment: LINUX 2.6.9
> Reporter: lohit vijayarenu
> Attachments: Datanode_jstack.txt
>
>
> TestUrlStreamHandler sets setURLStreamHandlerFactory as
> {noformat}
> FsUrlStreamHandlerFactory factory =
> new org.apache.hadoop.fs.FsUrlStreamHandlerFactory();
> java.net.URL.setURLStreamHandlerFactory(factory);
> {noformat}
> After this, MiniDFSCluster seems to hang while Datanodes tries to register in setNewStorageID, specifically at
> {noformat}
> rand = SecureRandom.getInstance("SHA1PRNG").nextInt(Integer.MAX_VALUE);
> {noformat}
> jstack output shows that the main thread is stuck in RawLocalFileSystem$LocalFSFileInputStream.read
> (Attaching the jstack)
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