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https://issues.apache.org/jira/browse/HBASE-4479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119246#comment-13119246
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ramkrishna.s.vasudevan commented on HBASE-4479:
-----------------------------------------------
{code}
2011-10-01 06:13:12,255 ERROR [main-EventThread] master.HMaster(1275): Primary
master encountered unexpected exception while trying to recover from ZooKeeper
session expiry. Proceeding with server abort.
java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Random.java:250)
at
org.apache.hadoop.hbase.master.DefaultLoadBalancer.retainAssignment(DefaultLoadBalancer.java:590)
at
org.apache.hadoop.hbase.master.AssignmentManager.assignAllUserRegions(AssignmentManager.java:1880)
at
org.apache.hadoop.hbase.master.AssignmentManager.processRegionsInTransition(AssignmentManager.java:385)
at
org.apache.hadoop.hbase.master.AssignmentManager.processRegionsInTransition(AssignmentManager.java:338)
at
org.apache.hadoop.hbase.master.HMaster.tryRecoveringExpiredZKSession(HMaster.java:1250)
at org.apache.hadoop.hbase.master.HMaster.abortNow(HMaster.java:1273)
at org.apache.hadoop.hbase.master.HMaster.abort(HMaster.java:1212)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.connectionEvent(ZooKeeperWatcher.java:324)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:242)
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
2011-10-01 06:13:12,255 FATAL [main-EventThread] master.HMaster(1213):
master:42546-0x132be1ce3a00009 master:42546-0x132be1ce3a00009 received expired
from ZooKeeper, aborting
org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode =
Session expired
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.connectionEvent(ZooKeeperWatcher.java:324)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:242)
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
2011-10-01 06:13:12,256 INFO [main-EventThread] master.HMaster(1343): Aborting
{code}
> TestMasterFailover failure in Hbase-0.92#17
> -------------------------------------------
>
> Key: HBASE-4479
> URL: https://issues.apache.org/jira/browse/HBASE-4479
> Project: HBase
> Issue Type: Bug
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Minor
>
> When the master restarted it was not able to get any servers online and the
> restart was a clean restart.
> Hence there were no regions to assign.
> Hence the retainAssignment tries to get one of the regions and uses
> RANDOM.getInt(size). Here size is 0.
> So ideally 0 is not accepted here. Hence we have got an exception making the
> master not to come up and the test case timeout.
> Though we need to see if really no regions was expected when the master came
> up, but this JIRA's intent is to deal such scenario where the size can be 0.
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