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From "Manu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (GEARPUMP-359) The premature OutputWatermark advancing logic in Subscription is not right
Date Thu, 26 Oct 2017 22:37:00 GMT

     [ https://issues.apache.org/jira/browse/GEARPUMP-359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Manu Zhang resolved GEARPUMP-359.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.8.5

Issue resolved by pull request 234
[https://github.com/apache/incubator-gearpump/pull/234]

> The premature OutputWatermark advancing logic in Subscription is not right
> --------------------------------------------------------------------------
>
>                 Key: GEARPUMP-359
>                 URL: https://issues.apache.org/jira/browse/GEARPUMP-359
>             Project: Apache Gearpump
>          Issue Type: Bug
>            Reporter: Huafeng Wang
>            Assignee: Huafeng Wang
>             Fix For: 0.8.5
>
>
> {{Subscription}} will update processingWatermark when sending a message and update outputWatermark
when receiving an Ack message. It will cause prematurely updating the outputWatermark in such
scenario: the {{Subscription}} already sent 200 messages to downstream and now the processingWatermark
is 200th message's watermark, then it receives the first 100 messages' Ack and it will advance
the outputWatermark to 200th message's watermark, not the 100th one, which is wrong.



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