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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4654) [replication] Add a check to make sure we don't replicate to ourselves
Date Wed, 16 Nov 2011 16:55:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151323#comment-13151323
] 

Lars Hofhansl commented on HBASE-4654:
--------------------------------------

I was thinking about that, would certainly be more user friendly. That means, though, that
we already have to get the peerClusterId at that time, which in turns means that we have to
make the connection to the peer cluster's ZK right away. 

On the other hand, I don't expect that to be a common scenario, just a safeguard against user
error.
                
> [replication] Add a check to make sure we don't replicate to ourselves
> ----------------------------------------------------------------------
>
>                 Key: HBASE-4654
>                 URL: https://issues.apache.org/jira/browse/HBASE-4654
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.90.5
>
>         Attachments: 4654-trunk.txt
>
>
> It's currently possible to add a peer for replication and point it to the local cluster,
which I believe could very well happen for those like us that use only one ZK ensemble per
DC so that only the root znode changes when you want to set up replication intra-DC.
> I don't think comparing just the cluster ID would be enough because you would normally
use a different one for another cluster and nothing will block you from pointing elsewhere.
> Comparing the ZK ensemble address doesn't work either when you have multiple DNS entries
that point at the same place.
> I think this could be resolved by looking up the master address in the relevant znode
as it should be exactly the same thing in the case where you have the same cluster.

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