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https://issues.apache.org/jira/browse/BOOKKEEPER-67?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104426#comment-13104426
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Matthieu Morel commented on BOOKKEEPER-67:
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By systematically, I mean: on every run I did on _linux_ machines.
I'm using a vanilla bookkeeper version from trunk.
I'm attaching logs. They contain the test output as well as a full thread dump
taken when the test was stuck.
As you can see, the issue is most probably due to reaching the max open files
limit, which is usually 1024 by default on linux.
> BookieReadWriteTest gets blocked and never finishes
> ---------------------------------------------------
>
> Key: BOOKKEEPER-67
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-67
> Project: Bookkeeper
> Issue Type: Bug
> Environment: RHEL4.8 and Debian 6
> Reporter: Matthieu Morel
> Attachments: BookieReadWriteTest-RHEL4.8.log
>
>
> I systematically reproduce this behaviour on the linux boxes I tested with.
> The test gets stuck acquiring permits from a semaphore, normally used for
> throttling:
> "main" prio=10 tid=0x08058c00 nid=0x588d waiting on condition [0xf723c000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0xb5619728> (a
> java.util.concurrent.Semaphore$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:969)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1281)
> at java.util.concurrent.Semaphore.acquire(Semaphore.java:286)
> at
> org.apache.bookkeeper.client.LedgerHandle.asyncAddEntry(LedgerHandle.java:394)
> at
> org.apache.bookkeeper.client.LedgerHandle.asyncAddEntry(LedgerHandle.java:366)
> at
> org.apache.bookkeeper.test.BookieReadWriteTest.testShutdown(BookieReadWriteTest.java:815)
> The issue might come from the synchronization mechanism used in the test
> itself.
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