[ https://issues.apache.org/jira/browse/HBASE-14891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yu Li reopened HBASE-14891: --------------------------- Reopen issue to submit patch for branch-1 and branch-1.2 > Add log for uncaught exception in RegionServerMetricsWrapperRunnable > -------------------------------------------------------------------- > > Key: HBASE-14891 > URL: https://issues.apache.org/jira/browse/HBASE-14891 > Project: HBase > Issue Type: Improvement > Components: metrics > Reporter: Yu Li > Assignee: Yu Li > Priority: Minor > Fix For: 2.0.0 > > Attachments: HBASE-14891.patch, HBASE-14891.v2.patch, > HBASE-14891.v2.patch > > > We are using ScheduledExecutorService#scheduleWithFixedDelay to periodically > reporting metrics. From javadoc of this method > {quote} > If any execution of the task encounters an exception, subsequent executions > are suppressed. > {quote} > We could see if any uncaught exception like NPE thrown in the task thread, > there won't be any error thrown but the task would be silently terminated. > In our real case we were making some modification to the metrics and causing > NPE carelessly, then we found metrics disappeared but cannot get a clue from > RS log. > Suggest to catch Throwable in > MetricsRegionServerWrapperImpl$RegionServerMetricsWrapperRunnable, add some > log there and suppress the exception to give it another try at next scheduled > run. -- This message was sent by Atlassian JIRA (v6.3.4#6332)