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From "Robert Nettleton (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-17529) Ambari LogSearch REST Layer should not queue up requests that have already been made
Date Fri, 04 Nov 2016 18:45:58 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-17529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Nettleton updated AMBARI-17529:
--------------------------------------
    Attachment: AMBARI-17529.patch.2

Uploaded second version of patch, including some feedback from the review.  

> Ambari LogSearch REST Layer should not queue up requests that have already been made
> ------------------------------------------------------------------------------------
>
>                 Key: AMBARI-17529
>                 URL: https://issues.apache.org/jira/browse/AMBARI-17529
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.4.0
>            Reporter: Robert Nettleton
>            Assignee: Robert Nettleton
>            Priority: Critical
>             Fix For: 2.5.0
>
>         Attachments: AMBARI-17529.patch.2
>
>
> The review for the fix for AMBARI-17510 brought up some interesting issues that should
be investigated and addressed in a separate patch.
> From [~jonathan.hurley]'s comments on https://reviews.apache.org/r/49474/:
> "Based on what we've seen, the requests to the LOGSEARCH endpoint don't return until
the connection times out (which could be never depending on what's configured). This will
then cause this Executor to fill it's queue with a backlog of requests.
> Instead, maybe it would be better to:
> - Only enqueue if the request isn't already enqueued
> - Use a bounded executor and rejection policy"
> This work will involve investigating the best approach towards limiting the possibility
of duplicate requests being made to the LogSearch REST service, either by making a check prior
to adding the request, or by using a bounded executor in the way described above. 



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