[jira] [Commented] (KAFKA-3178) Expose a method in AdminUtils to manually truncate a specific partition to a particular offset

["Bill Warshaw (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15129513#comment-15129513 ] 

Bill Warshaw commented on KAFKA-3178:
-------------------------------------

[~vahid] fyi this ticket may end up closing; we are exploring using the message timestamp functionality from KIP-32 to implement a timestamp-based deletion policy, which will effectively do the same thing as this proposal, and be simpler to implement

> Expose a method in AdminUtils to manually truncate a specific partition to a particular offset
> ----------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-3178
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3178
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Bill Warshaw
>            Assignee: Vahid Hashemian
>              Labels: kafka
>
> h3. Description
> One of Kafka's officially-described use cases is a distributed commit log (http://kafka.apache.org/documentation.html#uses_commitlog).  In this case, for a distributed service that needed a commit log, there would be a topic with a single partition to guarantee log order.  This service would use the commit log to re-sync failed nodes.  Kafka is generally an excellent fit for such a system, but it does not expose an adequate mechanism for log cleanup in such a case.  The built-in log cleanup mechanisms are based on time / size thresholds, which doesn't work well with a commit log; data can only be deleted from a commit log when the client application determines that it is no longer needed.  Here we propose a new API exposed to clients through AdminUtils that will delete all messages before a certain offset from a specific partition.
> h3. Rejected Alternatives
> - Manually setting / resetting time intervals for log retention configs to periodically flush messages from the logs from before a certain time period.  Doing this involves several asynchronous processes, none of which provide any hooks to know when they are actually complete.
> - Rolling a new topic each time we want to cleanup the log.  This is the best existing approach, but is not ideal.  All incoming writes would be paused while waiting for a new topic to be created.



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