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From "Aravindan Vijayan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-21593) RU: AMS stopped after RU [AMS distributed mode]
Date Fri, 28 Jul 2017 04:49:03 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-21593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aravindan Vijayan updated AMBARI-21593:
---------------------------------------
    Status: Patch Available  (was: Open)

> RU: AMS stopped after RU [AMS distributed mode]
> -----------------------------------------------
>
>                 Key: AMBARI-21593
>                 URL: https://issues.apache.org/jira/browse/AMBARI-21593
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-metrics
>    Affects Versions: 2.5.2
>            Reporter: Aravindan Vijayan
>            Assignee: Aravindan Vijayan
>            Priority: Blocker
>             Fix For: 2.5.2
>
>         Attachments: AMBARI-21593.patch
>
>
> *PROBLEM*
> When 2 metric collectors are started up simultaneously, both of them fail to start.
> *BUG*
> There exists a race condition in the Metric Collector HA controller initialization which
was introduced through AMBARI-20179. When a helix controller instance finds that the /ambari-metrics-collector
znode exists but a child node does not exists, it deletes the entire znode and recreates.
If another controller instance also initializes simultaneously, a race condition can occur
wherein each instance will end up cancelling the effort of the other. 
> *FIX*
> Do not delete and recreate the znode. Wait and retry for a few seconds to check if /ambari-metrics-collector
was fully initailized. 



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