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[jira] [Created] (HBASE-20678) NPE in ReplicationSourceManager#NodeFailoverWorker


Guanghao Zhang created HBASE-20678:
--------------------------------------

             Summary: NPE in ReplicationSourceManager#NodeFailoverWorker
                 Key: HBASE-20678
                 URL: https://issues.apache.org/jira/browse/HBASE-20678
             Project: HBase
          Issue Type: Umbrella
            Reporter: Guanghao Zhang


2018-06-04 10:28:43,362 INFO  [ReplicationExecutor-0] replication.ZKReplicationQueueStorage(432): Claim queue queueId=1 from hao-optiplex-7050,38491,1528079278158 to hao-optiplex-7050,39931,1528079278272 failed with org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode, someone else took the log?
Exception in thread "ReplicationExecutor-0" java.lang.NullPointerException                                                                                                                                  
  at org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceManager$NodeFailoverWorker.run(ReplicationSourceManager.java:858)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  at java.lang.Thread.run(Thread.java:748)


ZKReplicationQueueStorage's claimQueue method may return null when got NoNodeException.
{code:java}
          Pair<String, SortedSet<String>> peer = queueStorage.claimQueue(deadRS,
            queues.get(ThreadLocalRandom.current().nextInt(queues.size())), server.getServerName());
          long sleep = sleepBeforeFailover / 2;
          if (!peer.getSecond().isEmpty()) {
            newQueues.put(peer.getFirst(), peer.getSecond());
            sleep = sleepBeforeFailover;
          }
{code}



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