This is bad, we should fix it and release 3.4.8 soon. With the holidays and such, we won't be able to produce an RC and vote, so I suggest we target early Jan. In the meanwhile, I'd suggest users to not move to 3.4.7.
I've reopened ZK-1907 and suggested a fix to this problem. -Flavio > On 16 Dec 2015, at 21:01, Ted Yu <yuzhih...@gmail.com> wrote: > > Logged ZOOKEEPER-2347 > > Thanks > > On Wed, Dec 16, 2015 at 12:36 PM, Camille Fournier <cami...@apache.org> > wrote: > >> Blergh. We made shutdown synchronized. But decrementing the requests is >> also synchronized and called from a different thread. So yeah, deadlock. >> >> Can you open a ticket for this? This came in with ZOOKEEPER-1907 >> >> C >> >> On Wed, Dec 16, 2015 at 2:46 PM, Ted Yu <yuzhih...@gmail.com> wrote: >> >>> Hi, >>> HBase recently upgraded to zookeeper 3.4.7 >>> >>> In one of the tests, TestSplitLogManager, there is reproducible hang at >> the >>> end of the test. >>> Below is snippet from stack trace related to zookeeper: >>> >>> "main-EventThread" daemon prio=5 tid=0x00007fd27488a800 nid=0x6f1f >> waiting >>> on condition [0x000000011834b000] >>> java.lang.Thread.State: WAITING (parking) >>> at sun.misc.Unsafe.park(Native Method) >>> - parking to wait for <0x00000007c5b8d3a0> (a >>> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) >>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) >>> at >>> >>> >> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043) >>> at >>> >> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) >>> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:501) >>> >>> "main-SendThread(localhost:59510)" daemon prio=5 tid=0x00007fd274eb4000 >>> nid=0x9513 waiting on condition [0x0000000118042000] >>> java.lang.Thread.State: TIMED_WAITING (sleeping) >>> at java.lang.Thread.sleep(Native Method) >>> at >>> >>> >> org.apache.zookeeper.client.StaticHostProvider.next(StaticHostProvider.java:101) >>> at >>> >>> >> org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:997) >>> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1060) >>> >>> "SyncThread:0" prio=5 tid=0x00007fd274d02000 nid=0x730f waiting for >> monitor >>> entry [0x00000001170ac000] >>> java.lang.Thread.State: BLOCKED (on object monitor) >>> at >>> >>> >> org.apache.zookeeper.server.ZooKeeperServer.decInProcess(ZooKeeperServer.java:512) >>> - waiting to lock <0x00000007c5b62128> (a >>> org.apache.zookeeper.server.ZooKeeperServer) >>> at >>> >>> >> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:144) >>> at >>> >>> >> org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:200) >>> at >>> >>> >> org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:131) >>> >>> "main-EventThread" daemon prio=5 tid=0x00007fd2753a3800 nid=0x711b >> waiting >>> on condition [0x0000000117a30000] >>> java.lang.Thread.State: WAITING (parking) >>> at sun.misc.Unsafe.park(Native Method) >>> - parking to wait for <0x00000007c9b106b8> (a >>> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) >>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) >>> at >>> >>> >> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043) >>> at >>> >> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) >>> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:501) >>> >>> "main" prio=5 tid=0x00007fd276000000 nid=0x1903 in Object.wait() >>> [0x0000000108aa1000] >>> java.lang.Thread.State: WAITING (on object monitor) >>> at java.lang.Object.wait(Native Method) >>> - waiting on <*0x00000007c5b66400*> (a >>> org.apache.zookeeper.server.SyncRequestProcessor) >>> at java.lang.Thread.join(Thread.java:1281) >>> - locked <*0x00000007c5b66400*> (a >>> org.apache.zookeeper.server.SyncRequestProcessor) >>> at java.lang.Thread.join(Thread.java:1355) >>> at >>> >>> >> org.apache.zookeeper.server.SyncRequestProcessor.shutdown(SyncRequestProcessor.java:213) >>> at >>> >>> >> org.apache.zookeeper.server.PrepRequestProcessor.shutdown(PrepRequestProcessor.java:770) >>> at >>> >>> >> org.apache.zookeeper.server.ZooKeeperServer.shutdown(ZooKeeperServer.java:478) >>> - locked <0x00000007c5b62128> (a >>> org.apache.zookeeper.server.ZooKeeperServer) >>> at >>> >>> >> org.apache.zookeeper.server.NIOServerCnxnFactory.shutdown(NIOServerCnxnFactory.java:266) >>> at >>> >>> >> org.apache.hadoop.hbase.zookeeper.MiniZooKeeperCluster.shutdown(MiniZooKeeperCluster.java:301) >>> >>> Note the bold address in the last hunk which seems to indicate some form >> of >>> deadlock. >>> >>> I can send the full stack trace upon request. >>> When reverting to 3.4.6, the test passes. >>> >>> Comment / hint is welcome. >>> >>> Cheers >>> >>
