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Posted to common-issues@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2020/07/06 15:31:00 UTC
[jira] [Resolved] (HADOOP-17081) MetricsSystem doesn't start the
sink adapters on restart
[ https://issues.apache.org/jira/browse/HADOOP-17081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran resolved HADOOP-17081.
-------------------------------------
Fix Version/s: 3.3.1
3.2.2
Resolution: Fixed
+1 -committed to branches 3.2, 3.3 and trunk. Thanks!
> MetricsSystem doesn't start the sink adapters on restart
> --------------------------------------------------------
>
> Key: HADOOP-17081
> URL: https://issues.apache.org/jira/browse/HADOOP-17081
> Project: Hadoop Common
> Issue Type: Bug
> Components: metrics
> Environment: NA
> Reporter: Madhusoodan
> Assignee: Madhusoodan
> Priority: Minor
> Fix For: 3.2.2, 3.3.1
>
>
> In HBase we use dynamic metrics and when a metric is removed, we have to refresh the JMX beans, since there is no API from Java to do it, a hack like stopping the metrics system and restarting it was used (Read the comment on the class [https://github.com/mmpataki/hbase/blob/master/hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/impl/JmxCacheBuster.java])
>
> It calls the below APIs in the same order
> MetricsSystem.stop
> MetricsSystem.start
>
> MetricsSystem.stop stops all the SinkAdapters, *but doesn't remove them from the sink list* (allSinks is the variable). When the metrics system is started again, *it is assumed that the SinkAdapters are restarted, but they are not* due to the check done in the beginning of the function register.
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