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From "Gregory Chanan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6904) In the HBase shell, an error is thrown that states replication-related znodes already exist
Date Wed, 31 Oct 2012 22:31:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488319#comment-13488319
] 

Gregory Chanan commented on HBASE-6904:
---------------------------------------

There is such a call but it doesn't really make things any better.

Let's say you used that call...you'd do something like this:
{code}
if(!zk.exists(znode)) {
  zk.create(znode);
}
{code}

But what if another client does the same thing at the same time? (remember, we just want the
znode to exist, don't care who creates it).  Well, one of the create calls will get a NodeExistsException,
so you need the try/catch anyway and calling exists hasn't saved you anything.
                
> In the HBase shell, an error is thrown that states replication-related znodes already
exist
> -------------------------------------------------------------------------------------------
>
>                 Key: HBASE-6904
>                 URL: https://issues.apache.org/jira/browse/HBASE-6904
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication, Zookeeper
>    Affects Versions: 0.92.0, 0.92.1, 0.96.0
>            Reporter: Aleksandr Shulman
>            Assignee: Gregory Chanan
>            Priority: Minor
>             Fix For: 0.94.3, 0.96.0
>
>         Attachments: HBASE-6904-94.patch, HBASE-6904.patch
>
>
> On a replication-enabled cluster, querying the list_peers produces the error lines shown
below. It doesn't appear that anything is broken in terms of functionality.
> Stack trace:
> hbase(main):001:0> list_peers
> 12/09/29 14:41:03 ERROR zookeeper.RecoverableZooKeeper: Node /hbase/replication/peers
already exists and this is not a retry
> 12/09/29 14:41:03 ERROR zookeeper.RecoverableZooKeeper: Node /hbase/replication/rs already
exists and this is not a retry
> PEER ID CLUSTER KEY
> 0 row(s) in 0.4650 seconds

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