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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6058) Use ZK 3.4 API 'multi' in bulk assignment
Date Wed, 20 Jun 2012 21:59:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397923#comment-13397923
] 

Andrew Purtell commented on HBASE-6058:
---------------------------------------

We run 3.4 in production and have had no issues.

Multi has not had much use though, relative to the remainder of the ZK API. IMO, 0.96 is a
good target for use of it, and we should get such usage in soon enough so we can have plenty
of experience with it before cutting a release that uses it.
                
> 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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