lujie created HDFS-14372:
----------------------------
Summary: NPE while DN is shutting down
Key: HDFS-14372
URL: https://issues.apache.org/jira/browse/HDFS-14372
Project: Hadoop HDFS
Issue Type: Bug
Reporter: lujie
Assignee: lujie
Take the code BPServiceActor#register:
{code:java}
while (shouldRun()) {
try {
// Use returned registration from namenode with updated fields
newBpRegistration = bpNamenode.registerDatanode(newBpRegistration);
newBpRegistration.setNamespaceInfo(nsInfo);
bpRegistration = newBpRegistration;
break;
} catch(EOFException e) { // namenode might have just restarted
....
}
LOG.info("Block pool " + this + " successfully registered with NN");
bpos.registrationSucceeded(this, bpRegistration);
{code}
if DN is shutdown, then above code will skip the loop, and bpRegistration ==
null, the null value will be used DataNode#bpRegistrationSucceeded:
{code:java}
if(!storage.getDatanodeUuid().equals(bpRegistration.getDatanodeUuid()))
{code}
hence NPE happens
{code:java}
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.datanode.DataNode.bpRegistrationSucceeded(DataNode.java:1583)
at
org.apache.hadoop.hdfs.server.datanode.BPOfferService.registrationSucceeded(BPOfferService.java:425)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:807)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:294)
at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:840)
at java.lang.Thread.run(Thread.java:745)
{code}
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