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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3062) JMXCacheBuster restarting the metrics system causes PhoenixTracingEndToEndIT to hang
Date Fri, 03 Mar 2017 01:29:45 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893536#comment-15893536
] 

Enis Soztutar commented on PHOENIX-3062:
----------------------------------------

When the metrics system gets restarted, it picks the new sinks from the properties file from
the metrics system. I am not sure whether the tracing system is registered normally in that
file. If it is, this is not a production issue then. Otherwise, you are right. 

On a separate note, tracing system piggy-backing on the metrics subsystem is not right. A
simple bounded queue with a separate daemon thread would have solve the tracing use case.
I think we should fix that for the long term. 

> JMXCacheBuster restarting the metrics system causes PhoenixTracingEndToEndIT to hang
> ------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-3062
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3062
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 4.10.0
>
>         Attachments: phoenix-3062_v1.patch
>
>
> With some recent fixes in the hbase metrics system, we are now affectively restarting
the metrics system (in HBase-1.3.0, probably not affecting 1.2.0). Since we use a custom sink
in the PhoenixTracingEndToEndIT, restarting the metrics system loses the registered sink thus
causing a hang. 
> We need a fix in HBase, and Phoenix so that we will not restart the metrics during tests.

> Thanks to [~sergey.soldatov] for analyzing the initial root cause of the hang. 
> See HBASE-14166 and others. 



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