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Posted to dev@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2009/04/07 19:24:13 UTC
[jira] Issue Comment Edited: (HBASE-1311) ZooKeeperWrapper: Failed
to set watcher on ZNode /hbase/master
[ https://issues.apache.org/jira/browse/HBASE-1311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696631#action_12696631 ]
Andrew Purtell edited comment on HBASE-1311 at 4/7/09 10:23 AM:
----------------------------------------------------------------
See attached hack of ZooKeeperWrapper to reinitialize the zookeeper handle and recreate ephemeral nodes. This works to address HBASE-1311 but the actions that run from watchers when they see the ephemeral znodes go away because of session expiration (as opposed to real process/node failures) lead to problems like HBASE-1314 and HBASE-1315.
was (Author: apurtell):
See attached hack of ZooKeeperWrapper to reinitialize the zookeeper handle and recreate ephemeral nodes. This works to address HBASE-1311 but the actions that run from watchers when they see the ephemeral znodes go away lead to problems like HBASE-1314 and HBASE-1315.
> ZooKeeperWrapper: Failed to set watcher on ZNode /hbase/master
> --------------------------------------------------------------
>
> Key: HBASE-1311
> URL: https://issues.apache.org/jira/browse/HBASE-1311
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: Andrew Purtell
> Assignee: Nitay Joffe
> Attachments: dumb-wrapper-hack.patch
>
>
> After about 12 hours of operation, this repeats over and over in the regionserver log:
> 2009-04-05 19:44:38,445 WARN org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Failed to set watcher on ZNode /hbase/master
> org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode = Session expired
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
> at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:709)
> at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.watchMasterAddress(ZooKeeperWrapper.java:235)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.watchMasterAddress(HRegionServer.java:343)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.process(HRegionServer.java:339)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:366)
> 2009-04-05 19:44:38,445 WARN org.apache.hadoop.hbase.regionserver.HRegionServer: Unable to set watcher on ZooKeeper master address. Retrying.
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