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https://issues.apache.org/jira/browse/KAFKA-1355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967666#comment-13967666
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Joel Koshy commented on KAFKA-1355:
-----------------------------------
Tim's patch in 1363 conflicts with this. So we can get 1363 in first, and I
will rebase this one.
> Reduce/optimize update metadata requests sent during leader election
> --------------------------------------------------------------------
>
> Key: KAFKA-1355
> URL: https://issues.apache.org/jira/browse/KAFKA-1355
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8.1
> Reporter: Joel Koshy
> Priority: Critical
> Fix For: 0.8.1.1
>
> Attachments: KAFKA-1355.patch, KAFKA-1355_2014-04-04_13:48:34.patch,
> KAFKA-1355_2014-04-04_13:51:22.patch
>
>
> This is part of the investigation into slow shutdowns in 0.8.1. While
> logging contributes to bulk of the regression, this one also adds
> quite a bit of overhead:
> In addLeaderAndIsrRequest (called for every partition that is led by the
> broker being shut down) we also add an UpdateMetadataRequest - each call to
> addUpdateMetadataRequests does two traversals over _all_ (global)
> partitions. I think it should be straightforward to optimize this a bit.
> Marking as critical, since it is not as big an overhead as the logging.
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