[HBASE-25693] NPE getting metrics from standby masters (MetricsMasterWrapperImpl.getMergePlanCount)

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.2
• Fix Version/s: 3.0.0-alpha-1, 2.5.0, 2.4.3
• Component/s: master
• Hadoop Flags: Reviewed
• Assignee: Andrew Kyle Purtell
• Reporter: Andrew Kyle Purtell
• Created: 25/Mar/21 00:00
• Updated: 26/Mar/21 02:25
• Resolved: 25/Mar/21 02:10

Description

2021-03-24 23:26:15,828 ERROR [Timer for 'HBase' metrics system] impl.MetricsSourceAdapter: Error getting metrics from source Master,sub=Server
java.lang.NullPointerException
at org.apache.hadoop.hbase.master.MetricsMasterWrapperImpl.getMergePlanCount(MetricsMasterWrapperImpl.java:58)
at org.apache.hadoop.hbase.master.MetricsMasterSourceImpl.getMetrics(MetricsMasterSourceImpl.java:90)
at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMetrics(MetricsSourceAdapter.java:200)
at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.snapshotMetrics(MetricsSystemImpl.java:419)
at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.sampleMetrics(MetricsSystemImpl.java:406)
at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.onTimerEvent(MetricsSystemImpl.java:381)
at org.apache.hadoop.metrics2.impl.MetricsSystemImpl$4.run(MetricsSystemImpl.java:368)
at java.base/java.util.TimerThread.mainLoop(Timer.java:556)
at java.base/java.util.TimerThread.run(Timer.java:506)

Issue Links

• duplicates: HBASE-25480 NPE when getting metrics of backup master
• links to: GitHub Pull Request #3091