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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GEARPUMP-317) Task minClock could be non increasing
Date Sun, 18 Jun 2017 11:25:01 GMT

    [ https://issues.apache.org/jira/browse/GEARPUMP-317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16053168#comment-16053168
] 

ASF GitHub Bot commented on GEARPUMP-317:
-----------------------------------------

Github user huafengw commented on a diff in the pull request:

    https://github.com/apache/incubator-gearpump/pull/187#discussion_r122588570
  
    --- Diff: streaming/src/main/scala/org/apache/gearpump/streaming/task/TaskActor.scala
---
    @@ -35,7 +35,7 @@ import org.apache.gearpump.streaming.ExecutorToAppMaster._
     import org.apache.gearpump.streaming.ProcessorId
     import org.apache.gearpump.streaming.task.TaskActor._
     import org.apache.gearpump.util.{LogUtil, TimeOutScheduler}
    -import org.apache.gearpump.{MAX_TIME_MILLIS, MIN_TIME_MILLIS, Message, TimeStamp}
    +import org.apache.gearpump.{Message, TimeStamp}
    --- End diff --
    
    Better not refactor the whole class next time...


> Task minClock could be non increasing
> -------------------------------------
>
>                 Key: GEARPUMP-317
>                 URL: https://issues.apache.org/jira/browse/GEARPUMP-317
>             Project: Apache Gearpump
>          Issue Type: Bug
>          Components: streaming
>    Affects Versions: 0.8.3
>            Reporter: Manu Zhang
>            Assignee: Manu Zhang
>
> Task minClock is the minimum of upstream minClock and output minClock. Considering the
following scenario,
> 1. Output minClock is set to Long.MaxValue since all messages have been acked by downstream
tasks
> 2. But there are messages buffered in a window function
> 3. Later the window is triggered and those messages are emitted, which will set the output
minClock to a smaller value.
> 4. Plus, the output messages are possibly not in time order, which again will make output
minClock non increasing.



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