clintropolis opened a new pull request #10021:
URL: https://github.com/apache/druid/pull/10021
### Description
This PR fixes an NPE which occurs during the balancer phase after #9971 due
to a missing parameter to pass on the broadcast datasources set in the
coordinator parameter builder class.
```
2020-06-11T13:34:21,945 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.ReservoirSegmentSampler.getRandomBalancerSegmentHolder(ReservoirSegmentSampler.java:47)
~[classes/:?]
at
org.apache.druid.server.coordinator.CostBalancerStrategy.pickSegmentToMove(CostBalancerStrategy.java:220)
~[classes/:?]
at
org.apache.druid.server.coordinator.duty.BalanceSegments.balanceServers(BalanceSegments.java:190)
~[classes/:?]
at
org.apache.druid.server.coordinator.duty.BalanceSegments.balanceTier(BalanceSegments.java:158)
~[classes/:?]
at
org.apache.druid.server.coordinator.duty.BalanceSegments.lambda$run$0(BalanceSegments.java:81)
~[classes/:?]
at java.util.HashMap.forEach(HashMap.java:1289) ~[?:1.8.0_242]
at
org.apache.druid.server.coordinator.duty.BalanceSegments.run(BalanceSegments.java:80)
~[classes/:?]
```
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