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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (KAFKA-4529) tombstone may be removed earlier than it should
Date Thu, 15 Dec 2016 18:06:58 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-4529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Guozhang Wang resolved KAFKA-4529.
    Resolution: Fixed

Marked as fixed for the release process.

> tombstone may be removed earlier than it should
> -----------------------------------------------
>                 Key: KAFKA-4529
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4529
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions:
>            Reporter: Jun Rao
>            Assignee: Jiangjie Qin
>             Fix For:
> As part of KIP-33, we introduced a regression on how tombstone is removed in a compacted
topic. We want to delay the removal of a tombstone to avoid the case that a reader first reads
a non-tombstone message on a key and then doesn't see the tombstone for the key because it's
deleted too quickly. So, a tombstone is supposed to only be removed from a compacted topic
after the tombstone is part of the cleaned portion of the log after delete.retention.ms.
> Before KIP-33, deleteHorizonMs in LogCleaner is calculated based on the last modified
time, which is monotonically increasing from old to new segments. With KIP-33, deleteHorizonMs
is calculated based on the message timestamp, which is not necessarily monotonically increasing.

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