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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