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https://issues.apache.org/jira/browse/KAFKA-3659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271886#comment-15271886
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ASF GitHub Bot commented on KAFKA-3659:
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GitHub user hachikuji opened a pull request:
https://github.com/apache/kafka/pull/1322
KAFKA-3659: Handle coordinator disconnects more gracefully in client
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hachikuji/kafka KAFKA-3659
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/1322.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1322
----
commit e3d0f3f950fc7005e690510b0f66a19d4ca4c10c
Author: Jason Gustafson <[email protected]>
Date: 2016-05-05T00:33:36Z
KAFKA-3659: Handle coordinator disconnects more gracefully in client
----
> Consumer does not handle coordinator connection blackout period gracefully
> --------------------------------------------------------------------------
>
> Key: KAFKA-3659
> URL: https://issues.apache.org/jira/browse/KAFKA-3659
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 0.9.0.0, 0.9.0.1
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
>
> Currently when the connection to the coordinator is closed, the consumer will
> immediately try to rediscover the coordinator and reconnect to it. This is
> fine as it is, but the NetworkClient enforces a blackout period before it
> will allow the reconnect to be attempted. This causes the following cycle
> which continues in a fairly tight loop until the blackout period has
> completed:
> 1. Notice connection failure (i.e. DISCONNECTED state in ConnectionStates)
> 2. Send GroupCoordinator request to rediscover coordinator.
> 3. Attempt to connect to coordinator.
> 4. Go back to 1.
> To fix this, we should avoid rediscovery while the connection is blacked out.
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