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https://issues.apache.org/jira/browse/KAFKA-1755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14198578#comment-14198578
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Chris Riccomini commented on KAFKA-1755:
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It might also be desirable to allow the log compaction to continue on the topic
in question, and simply keep all messages without keys without doing any
compaction on them.
> Log cleaner thread should not exit on errors
> --------------------------------------------
>
> Key: KAFKA-1755
> URL: https://issues.apache.org/jira/browse/KAFKA-1755
> Project: Kafka
> Issue Type: Bug
> Reporter: Joel Koshy
> Fix For: 0.8.3
>
>
> The log cleaner is a critical process when using compacted topics.
> However, if there is any error in any topic (notably if a key is missing)
> then the cleaner exits and all other compacted topics will also be adversely
> affected - i.e., compaction stops across the board.
> This can be improved by just aborting compaction for a topic on any error and
> keep the thread from exiting.
> Another improvement would be to reject messages without keys that are sent to
> compacted topics although this is not enough by itself.
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