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https://issues.apache.org/jira/browse/KAFKA-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15182552#comment-15182552
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ASF GitHub Bot commented on KAFKA-2960:
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GitHub user becketqin opened a pull request:
https://github.com/apache/kafka/pull/1018
KAFKA-2960: Clear purgatory for partitions before becoming follower
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/becketqin/kafka KAFKA-2960
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/1018.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 #1018
----
commit 6ee590bc8f65217227c8bda98644dce35ed0d701
Author: Jiangjie Qin <[email protected]>
Date: 2016-03-07T04:04:45Z
KAFKA-2960: Clear purgatory for partition before becoming follower
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> DelayedProduce may cause message lose during repeatly leader change
> -------------------------------------------------------------------
>
> Key: KAFKA-2960
> URL: https://issues.apache.org/jira/browse/KAFKA-2960
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.9.0.0
> Reporter: Xing Huang
> Assignee: Jiangjie Qin
> Fix For: 0.10.0.0
>
>
> related to #KAFKA-1148
> When a leader replica became follower then leader again, it may truncated its
> log as follower. But the second time it became leader, its ISR may shrink and
> if at this moment new messages were appended, the DelayedProduce generated
> when it was leader the first time may be satisfied, and the client will
> receive a response with no error. But, actually the messages were lost.
> We simulated this scene, which proved the message lose could happen. And it
> seems to be the reason for a data lose recently happened to us according to
> broker logs and client logs.
> I think we should check the leader epoch when send a response, or satisfy
> DelayedProduce when leader change as described in #KAFKA-1148.
> And we may need an new error code to inform the producer about this error.
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