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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11932) BPServiceActor thread name is not correctly set
Date Mon, 05 Jun 2017 22:37:12 GMT
Chen Liang created HDFS-11932:
---------------------------------

             Summary: BPServiceActor thread name is not correctly set
                 Key: HDFS-11932
                 URL: https://issues.apache.org/jira/browse/HDFS-11932
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs
            Reporter: Chen Liang
            Assignee: Chen Liang


When running unit tests (e.g. TestJMXGet), we often get this following exception, although
the tests still passed:
{code}
WARN  datanode.DataNode (BPOfferService.java:getBlockPoolId(192)) - Block pool ID needed,
but service not yet registered with NN
java.lang.Exception: trace 
at org.apache.hadoop.hdfs.server.datanode.BPOfferService.getBlockPoolId(BPOfferService.java:192)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.formatThreadName(BPServiceActor.java:556)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.start(BPServiceActor.java:544) at

...
{code}

It seems that, although this does not affect normal operations, this is causing the thread
name of BPServiceActor not correctly set as desired. More specifically,:
{code}
 bpThread = new Thread(this, formatThreadName("heartbeating", nnAddr));
 bpThread.setDaemon(true); // needed for JUnit testing
 bpThread.start();
{code}

The first line tries to call formatThreadName to get format a thread name, and formatThreadName
is reading the value of BPOfferService#bpNSInfo. However this value is set only after the
thread started (the third line above). So we get exception in the first line for reading non-existing
value.



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