machine424 opened a new issue #10992:
URL: https://github.com/apache/druid/issues/10992
When I shut down all the historicals of a tier, A NullPointerException
exception gets raised in a log when the coordinator tries to emit a metric.
```
ERROR [Coordinator-Exec--0]
org.apache.druid.server.coordinator.DruidCoordinator - Caught exception,
ignoring so that schedule keeps going.:
{class=org.apache.druid.server.coordinator.DruidCoordinator,
exceptionType=class java.lang.NullPointerException, exceptionMessage=null}
java.lang.NullPointerException: null
at
org.apache.druid.server.coordinator.duty.EmitClusterStatsAndMetrics.lambda$run$1(EmitClusterStatsAndMetrics.java:114)
~[druid-server-0.20.0.jar:0.20.0]
at
org.apache.druid.server.coordinator.CoordinatorStats.forEachTieredStat(CoordinatorStats.java:92)
~[druid-server-0.20.0.jar:0.20.0]
at
org.apache.druid.server.coordinator.duty.EmitClusterStatsAndMetrics.run(EmitClusterStatsAndMetrics.java:107)
~[druid-server-0.20.0.jar:0.20.0]
at
org.apache.druid.server.coordinator.DruidCoordinator$DutiesRunnable.run(DruidCoordinator.java:792)
[druid-server-0.20.0.jar:0.20.0]
at
org.apache.druid.server.coordinator.DruidCoordinator$2.call(DruidCoordinator.java:619)
[druid-server-0.20.0.jar:0.20.0]
at
org.apache.druid.server.coordinator.DruidCoordinator$2.call(DruidCoordinator.java:612)
[druid-server-0.20.0.jar:0.20.0]
at
org.apache.druid.java.util.common.concurrent.ScheduledExecutors$4.run(ScheduledExecutors.java:158)
[druid-core-0.20.0.jar:0.20.0]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[?:1.8.0_265]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[?:1.8.0_265]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
[?:1.8.0_265]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
[?:1.8.0_265]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_265]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_265]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_265]
INFO [Coordinator-Exec--0]
org.apache.druid.server.coordinator.duty.LogUsedSegments - Found [xxx] used
segments.
```
It gets raised
[here](https://github.com/apache/druid/blob/master/server/src/main/java/org/apache/druid/server/coordinator/duty/EmitClusterStatsAndMetrics.java#L143)
I think.
Could we get rid of it?
### Affected Version
The Druid version where the problem was encountered: 0.20.0, maybe master
also
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