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https://issues.apache.org/jira/browse/KAFKA-1034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14142999#comment-14142999
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Sriram Subramanian commented on KAFKA-1034:
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At the high level, we were making to many writes to ZK during partition 
reassignment. Lot of things have changed since then and we would need to 
revisit the code to see if this is still an issue. It would be useful if 
someone who has touched this code recently can comment on it.

> Improve partition reassignment to optimize writes to zookeeper
> --------------------------------------------------------------
>
>                 Key: KAFKA-1034
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1034
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8.0, 0.8.1
>            Reporter: Sriram Subramanian
>            Assignee: Sriram Subramanian
>              Labels: newbie++
>             Fix For: 0.8.2
>
>
> For ReassignPartition tool, check if optimizing the writes to ZK after every 
> replica reassignment is possible



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