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https://issues.apache.org/jira/browse/BOOKKEEPER-67?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104441#comment-13104441
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Flavio Junqueira commented on BOOKKEEPER-67:
--------------------------------------------
Interestingly, when I run "ulimit -a", I get that the maximum number of open
file descriptors is 256:
{noformat}
core file size (blocks, -c) 0
data seg size (kbytes, -d) 6144
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 256
pipe size (512 bytes, -p) 1
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 266
virtual memory (kbytes, -v) unlimited
{noformat}
and yet I don't see the same problem. I'm puzzled...
> 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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