Great bug report Ted, the stack trace in particular is very useful.
It looks like a timing bug where the client is not shutting down cleanly on the close call. I reviewed the code in question but nothing pops out at me. Also the logs just show us shutting down, nothing else from zk in there.
Create a jira and attach all the detail you have available. Patrick On 08/11/2010 03:21 PM, Ted Yu wrote:
Hi, Using HBase 0.20.6 (with HBASE-2473) we encountered a situation where Regionserver process was shutting down and seemed to hang. Here is the bottom of region server log: http://pastebin.com/YYawJ4jA zookeeper-3.2.2 is used. Your comment is welcome. Here is relevant portion from jstack - I attempted to attach jstack twice in my email to d...@hbase.apache.org but failed: "DestroyJavaVM" prio=10 tid=0x00002aabb849c800 nid=0x6c60 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "regionserver/10.32.42.245:60020" prio=10 tid=0x00002aabb84ce000 nid=0x6c81 in Object.wait() [0x0000000043755000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on<0x00002aaab76633c0> (a org.apache.zookeeper.ClientCnxn$Packet) at java.lang.Object.wait(Object.java:485) at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1099) - locked<0x00002aaab76633c0> (a org.apache.zookeeper.ClientCnxn$Packet) at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1077) at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:505) - locked<0x00002aaabf5e0c30> (a org.apache.zookeeper.ZooKeeper) at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.close(ZooKeeperWrapper.java:681) at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:654) at java.lang.Thread.run(Thread.java:619) "main-EventThread" daemon prio=10 tid=0x0000000043474000 nid=0x6c80 waiting on condition [0x00000000413f3000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for<0x00002aaabf6e9150> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399) at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:414) "RMI TCP Accept-0" daemon prio=10 tid=0x00002aabb822c800 nid=0x6c7d runnable [0x0000000040752000] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:390) - locked<0x00002aaabf585578> (a java.net.SocksSocketImpl) at java.net.ServerSocket.implAccept(ServerSocket.java:453) at java.net.ServerSocket.accept(ServerSocket.java:421) at sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:34) at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:369) at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:341) at java.lang.Thread.run(Thread.java:619)
