Madhusoodan created HADOOP-17081:
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Summary: MetricsSystem restart doesn't register the sinks back
Key: HADOOP-17081
URL: https://issues.apache.org/jira/browse/HADOOP-17081
Project: Hadoop Common
Issue Type: Bug
Components: metrics
Environment: NA
Reporter: Madhusoodan
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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