The 2NN incorrectly daemonizes
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Key: HDFS-2896
URL: https://issues.apache.org/jira/browse/HDFS-2896
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Eli Collins
Assignee: Eli Collins
The SecondaryNameNode (and Checkpointer) confuse o.a.h.u.Daemon with a Unix
daemon. Per below it intends to create a thread that never ends, but
o.a.h.u.Daemon just marks a thread with Java's Thread#setDaemon which means
Java will terminate the thread when there are no more non-daemon user threads
running
{code}
// Create a never ending deamon
Daemon checkpointThread = new Daemon(secondary);
{code}
Perhaps they thought they were using commons Daemon. We of course don't want
the 2NN to exit unless it exits itself or is stopped explicitly. Currently it
won't do this because the main thread is not marked as a daemon thread. In any
case, let's make the 2NN consistent with the NN in this regard (exit when the
RPC thread exits).
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