Hello,
I just saw this in my five-node, three-regionserver cluster test. The
regionserver crashed with this error. Could this be related to some recent
changes involving ZK? Alternatively, this could be a concurrency issue of
its own.
2011-11-21 01:30:15,188 FATAL
org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING region server
<hostname>,60020,1321867814890: Initialization of RS failed. Hence
aborting RS.
java.util.ConcurrentModificationException
at java.util.Hashtable$Enumerator.next(Hashtable.java:1031)
at
org.apache.hadoop.conf.Configuration.iterator(Configuration.java:1042)
at
org.apache.hadoop.hbase.zookeeper.ZKConfig.makeZKProps(ZKConfig.java:75)
at
org.apache.hadoop.hbase.zookeeper.ZKConfig.getZKQuorumServersString(ZKConfig.java:245)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:144)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:124)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getZooKeeperWatcher(HConnectionManager.java:1262)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.setupZookeeperTrackers(HConnectionManager.java:568)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:559)
at
org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:183)
at
org.apache.hadoop.hbase.catalog.CatalogTracker.<init>(CatalogTracker.java:177)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.initializeZooKeeper(HRegionServer.java:575)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:534)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:642)
at java.lang.Thread.run(Thread.java:619)
Thanks,
--Mikhail
