[jira] [Created] (ZOOKEEPER-1816) ClientCnxn.close() should block until threads have died

["Jared Winick (JIRA)" <ji...@apache.org>]

Jared Winick created ZOOKEEPER-1816:
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             Summary: ClientCnxn.close() should block until threads have died
                 Key: ZOOKEEPER-1816
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1816
             Project: ZooKeeper
          Issue Type: Bug
          Components: java client
    Affects Versions: 3.4.5, 3.3.6
            Reporter: Jared Winick
            Priority: Minor


In the testing of ACCUMULO-1379 and ACCUMULO-1858 it was seen that the non-blocking behavior of ClientCnxn.close(), and therefore ZooKeeper.close(), can cause a race condition when undeploying an application running in a Java container such as JBoss or Tomcat. As the close() method returns without joining on the sendThread and eventThread, those threads continue to execute/cleanup while the container is cleaning up the application's resources. If the container has unloaded classes by the time this code runs

{code}
ZooTrace.logTraceMessage(LOG, ZooTrace.getTextTraceLevel(), "SendThread exitedloop.");
{code}

A "java.lang.NoClassDefFoundError: org/apache/zookeeper/server/ZooTrace" can be seen. 



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