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From "Matteo Bertozzi (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5666) RegionServer doesn't retry to check if base node is available
Date Tue, 03 Apr 2012 20:54:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245720#comment-13245720
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Matteo Bertozzi commented on HBASE-5666:
----------------------------------------

Still looking at the 0.90 code...
The new ZooKeeperWatcher (>=0.92) calls the ZKUtil.createAndFailSilent(), to create base
node and others, only if called by HMaster (canCreateBaseZNode = true), while before the code
path was the same for everyone.

So now, if HMaster has not reached the "create base node" point, before the HRegionServer
checks the existence of base node... the region server crashes...

If we want to keep the previous logic, the first one that arrives create the base node &
co, we can remove the canCreateBaseZNode flag, else we can use HBASE-5666-v4.patch to wait
and retry on checkExists().

what do you think?
                
> RegionServer doesn't retry to check if base node is available
> -------------------------------------------------------------
>
>                 Key: HBASE-5666
>                 URL: https://issues.apache.org/jira/browse/HBASE-5666
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, zookeeper
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>         Attachments: HBASE-5666-v1.patch, HBASE-5666-v2.patch, HBASE-5666-v3.patch, HBASE-5666-v4.patch,
hbase-1-regionserver.log, hbase-2-regionserver.log, hbase-3-regionserver.log, hbase-master.log,
hbase-regionserver.log, hbase-zookeeper.log
>
>
> I've a script that starts hbase and a couple of region servers in distributed mode (hbase.cluster.distributed
= true)
> {code}
> $HBASE_HOME/bin/start-hbase.sh
> $HBASE_HOME/bin/local-regionservers.sh start 1 2 3
> {code}
> but the region servers are not able to start...
> It seems that during the RS start the the znode is still not available, and HRegionServer.initializeZooKeeper()
check just once if the base not is available.
> {code}
> 2012-03-28 21:54:05,013 INFO org.apache.hadoop.hbase.regionserver.HRegionServer: STOPPED:
Check the value configured in 'zookeeper.znode.parent'. There could be a mismatch with the
one configured in the master.
> 2012-03-28 21:54:08,598 FATAL org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING
region server localhost,60202,1332964444824: Initialization of RS failed.  Hence aborting
RS.
> java.io.IOException: Received the shutdown message while waiting.
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.blockAndCheckIfStopped(HRegionServer.java:626)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeZooKeeper(HRegionServer.java:596)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:558)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:672)
> 	at java.lang.Thread.run(Thread.java:662)
> {code}

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