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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6295) use LoadingCache instead of WeakHashMap to lower latency
Date Tue, 18 Apr 2017 15:05:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15972872#comment-15972872
] 

ASF GitHub Bot commented on FLINK-6295:
---------------------------------------

Github user zentol commented on the issue:

    https://github.com/apache/flink/pull/3709
  
    @WangTaoTheTonic Because *everyone* uses guava which results again and again in dependency
conflicts. 
    
    What do you mean with "how long it should be"? We remove the job from the cache and that's
it. If more request for that job come in nothing will be returned resulting in the response
you get when querying for a non-existing job, which is an accurate representation of the state
of the JobManager. If the same JM recovers the job then it is no longer in a SUSPENDED state
and will be added to the cache again. If another JM picks the job up the web-ui will be redirected
to that JM and everything's fine.


> use LoadingCache instead of WeakHashMap to lower latency
> --------------------------------------------------------
>
>                 Key: FLINK-6295
>                 URL: https://issues.apache.org/jira/browse/FLINK-6295
>             Project: Flink
>          Issue Type: Bug
>          Components: Webfrontend
>            Reporter: Tao Wang
>            Assignee: Tao Wang
>
> Now in ExecutionGraphHolder, which is used in many handlers, we use a WeakHashMap to
cache ExecutionGraph(s), which is only sensitive to garbage collection.
> The latency is too high when JVM do GC rarely, which will make status of jobs or its
tasks unmatched with the real ones.
> LoadingCache is a common used cache implementation from guava lib, we can use its time
based eviction to lower latency of status update.



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