[jira] [Created] (HDFS-6057) DomainSocketWatcher.watcherThread should be marked as daemon thread

["Eric Sirianni (JIRA)" <ji...@apache.org>]

Eric Sirianni created HDFS-6057:
-----------------------------------

             Summary: DomainSocketWatcher.watcherThread should be marked as daemon thread
                 Key: HDFS-6057
                 URL: https://issues.apache.org/jira/browse/HDFS-6057
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.4.0
            Reporter: Eric Sirianni
            Priority: Minor


Running the tip of {{branch-2.4}}, I'm observing some zombie processes in my environment.  jstack shows the following thread preventing the JVM from shutting down:

{noformat}
"Thread-3" prio=10 tid=0x00007f0a908a5800 nid=0x3ee9 runnable [0x00007f0a89471000]
   java.lang.Thread.State: RUNNABLE
	at org.apache.hadoop.net.unix.DomainSocketWatcher.doPoll0(Native Method)
	at org.apache.hadoop.net.unix.DomainSocketWatcher.access$800(DomainSocketWatcher.java:52)
	at org.apache.hadoop.net.unix.DomainSocketWatcher$1.run(DomainSocketWatcher.java:455)
	at java.lang.Thread.run(Thread.java:679)
{noformat}

Marking the {{DomainSocketWatcher.watcherThread}} as a daemon thread would prevent this situation.  Is there any reason it isn't classified as such?

Also, tracing through the code, I don't see any code path where {{DomainSocketWatcher.close()}} is invoked (though this would seem to be a larger issue -- maybe I'm missing something...).



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