kafka-jira mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5793) Tighten up situations where OutOfOrderSequence may be returned
Date Thu, 21 Sep 2017 03:36:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16174222#comment-16174222

ASF GitHub Bot commented on KAFKA-5793:

Github user asfgit closed the pull request at:


> Tighten up situations where OutOfOrderSequence may be returned
> --------------------------------------------------------------
>                 Key: KAFKA-5793
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5793
>             Project: Kafka
>          Issue Type: Sub-task
>    Affects Versions:
>            Reporter: Apurva Mehta
>            Assignee: Apurva Mehta
>             Fix For: 1.0.0
> Details of the problem are provided here: https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Exactly+Once+-+Solving+the+problem+of+spurious+OutOfOrderSequence+errors
> A quick summary follows:
> In the discussion of KIP-185: Make exactly once in order delivery per partition the default
producer setting, the following point regarding the OutOfOrderSequenceException was raised:
> 1. The OutOfOrderSequenceException indicates that there has been data loss on the broker..
ie. a previously acknowledged message no longer exists. For most part, this should only occur
in rare situations (simultaneous power outages, multiple disk losses, software bugs resulting
in data corruption, etc.).
> 2. However, there is another perfectly normal scenario where data is removed: in particular,
data could be deleted because it is old and crosses the retention threshold.
> Hence, if a producer remains inactive for longer than a topic's retention period, we
could get an OutOfOrderSequence which is a false positive: the data is removed through valid
processes, and this isn't an error.
> 3. We would like to eliminate the possibility of getting spurious OutOfOrderSequenceExceptions
– when you get it, it should always mean data loss and should be taken very seriously. 

This message was sent by Atlassian JIRA

View raw message