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From "ramkrishna.s.vasudevan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5594) Unable to stop a master that's waiting on -ROOT- during initialization
Date Tue, 20 Mar 2012 07:05:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233270#comment-13233270

ramkrishna.s.vasudevan commented on HBASE-5594:

That was when the issue started i thought not there in 0.92.
But see the comment at 13/Dec/11 02:48
It is applicable for 0.92 also.  Some problems is when we wait for root we dont have access
to the master at all.  Because ZK classes dont give access to master related variables.  

> Unable to stop a master that's waiting on -ROOT- during initialization
> ----------------------------------------------------------------------
>                 Key: HBASE-5594
>                 URL: https://issues.apache.org/jira/browse/HBASE-5594
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.1
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.92.2, 0.94.0, 0.96.0
> We just had a case where the master (that was just restarted) was having a hard time
assigning -ROOT- (all the PRI handlers were full already) so we tried to shutdown the cluster
and even though all the RS closed down properly the master kept running being blocked on:
> {noformat}
> "master-sv4r20s12,10302,1331916142866" prio=10 tid=0x00007f3708008800 nid=0x4b20 in Object.wait()
>    java.lang.Thread.State: WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <0x00000006030be3f8> (a org.apache.hadoop.hbase.zookeeper.RootRegionTracker)
> 	at java.lang.Object.wait(Object.java:485)
> 	at org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.blockUntilAvailable(ZooKeeperNodeTracker.java:131)
> 	- locked <0x00000006030be3f8> (a org.apache.hadoop.hbase.zookeeper.RootRegionTracker)
> 	at org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.blockUntilAvailable(ZooKeeperNodeTracker.java:104)
> 	- locked <0x00000006030be3f8> (a org.apache.hadoop.hbase.zookeeper.RootRegionTracker)
> 	at org.apache.hadoop.hbase.catalog.CatalogTracker.waitForRoot(CatalogTracker.java:313)
> 	at org.apache.hadoop.hbase.master.HMaster.assignRootAndMeta(HMaster.java:571)
> 	at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:501)
> 	at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:336)
> 	at java.lang.Thread.run(Thread.java:662)
> {noformat}
> I haven't checked the 0.90 code, we got this on 0.92.1

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