[jira] [Created] (ZOOKEEPER-1047) ZooKeeper Standalone does not shutdown cleanly

["Gunnar Wagenknecht (JIRA)" <ji...@apache.org>]

ZooKeeper Standalone does not shutdown cleanly
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                 Key: ZOOKEEPER-1047
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1047
             Project: ZooKeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.3.3
            Reporter: Gunnar Wagenknecht


When I shutdown a standalone ZooKeeper server (programmatically) I get the following exception logged. Occasionally, no exception is logged. 
{noformat}
10:32:43.353 [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181] WARN  o.a.zookeeper.server.NIOServerCnxn - Ignoring unexpected runtime exception
java.nio.channels.CancelledKeyException: null
	at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55) ~[na:1.6.0_24]
	at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:69) ~[na:1.6.0_24]
	at org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:241) ~[na:na]
10:32:43.353 [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181] INFO  o.a.zookeeper.server.NIOServerCnxn - NIOServerCnxn factory exited run method
10:32:43.387 [SyncThread:0] INFO  o.a.z.server.SyncRequestProcessor - SyncRequestProcessor exited!
10:32:43.387 [ProcessThread:-1] INFO  o.a.z.server.PrepRequestProcessor - PrepRequestProcessor exited loop!
10:32:43.387 [app thread] INFO  o.a.z.server.FinalRequestProcessor - shutdown of request processor complete
{noformat}

Because it's logged with a WARN level, my assumption is that something is wrong on shutdown. However, I follow the exact same shutdown order than ZooKeeperMain, i.e. shutdown the {{NIOServerCnxn.Factory}} first and shutdown the {{ZooKeeperServer}} instance thereafter if its still running.

{noformat}
...
factory.shutdown();
factory = null;

if (zkServer.isRunning()) {
	zkServer.shutdown();
}
zkServer = null;
{noformat}




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