[jira] [Created] (RATIS-717) NPE thrown on the follower while instantiating RaftLeaderMetrics

["Siddharth Wagle (Jira)" <ji...@apache.org>]

Siddharth Wagle created RATIS-717:
-------------------------------------

             Summary: NPE thrown on the follower while instantiating RaftLeaderMetrics
                 Key: RATIS-717
                 URL: https://issues.apache.org/jira/browse/RATIS-717
             Project: Ratis
          Issue Type: Bug
          Components: metrics
    Affects Versions: 0.5.0
            Reporter: Siddharth Wagle
            Assignee: Aravindan Vijayan
             Fix For: 0.5.0


Error thrown while running Teragen on Ozone cluster.

{code}
Error getting metrics from source ratis_core.ratis_leader.3b9b7dee-f9c7-48e0-af14-5c043e050b84@group-C1E270F4213F
java.lang.NullPointerException
    at org.apache.ratis.server.impl.RaftLeaderMetrics.lambda$null$2(RaftLeaderMetrics.java:86)
    at com.github.joshelser.dropwizard.metrics.hadoop.HadoopMetrics2Reporter.snapshotAllMetrics(HadoopMetrics2Reporter.java:239)
    at com.github.joshelser.dropwizard.metrics.hadoop.HadoopMetrics2Reporter.getMetrics(HadoopMetrics2Reporter.java:219)
    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.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)
{code}



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