ZooKeeper Standalone does not shutdown cleanly
----------------------------------------------
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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