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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