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https://issues.apache.org/jira/browse/HBASE-6058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279559#comment-13279559
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Zhihong Yu commented on HBASE-6058:
-----------------------------------

There hasn't been consensus as to which HBase version would require zk 3.4 as 
the minimum supported version.
                
> Use ZK 3.4 API 'multi' in bulk assignment
> -----------------------------------------
>
>                 Key: HBASE-6058
>                 URL: https://issues.apache.org/jira/browse/HBASE-6058
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, zookeeper
>    Affects Versions: 0.96.0
>            Reporter: nkeywal
>            Assignee: nkeywal
>            Priority: Minor
>
> We use async API today. This is already much much faster than the sync API. 
> Still, it makes sense to use the 'multi' function: this will decrease the 
> network & zookeeper load at startup/rolling restart.
> On a 500 nodes cluster, we see 3 that 3 seconds are spent on updating ZK per 
> bulk assignment. This should cut it in half (+ the benefits on the network/zk 
> load).

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