wjhypo opened a new issue #9876:
URL: https://github.com/apache/druid/issues/9876
### Affected Version
Master branch
### Description
1) When `druid.broker.select.tier` is set to `custom` and
`druid.broker.select.tier.custom.priorities` is omitted, we get NPE when broker
updates server view, e.g, when there's segment balance in historical nodes.
2) When `druid.broker.select.tier` is set to `custom` and
`druid.broker.select.tier.custom.priorities` doesn't explicitly list all the
priorities of existing tiers, we get NPE same as above.
```
Exception in thread "BrokerServerView-1985" java.lang.NullPointerException
at
java.util.Comparator.lambda$comparingInt$7b0bb60$1(Comparator.java:490)
at
it.unimi.dsi.fastutil.ints.IntComparators$1.compare(IntComparators.java:86)
at
it.unimi.dsi.fastutil.ints.Int2ObjectRBTreeMap.compare(Int2ObjectRBTreeMap.java:205)
at
it.unimi.dsi.fastutil.ints.Int2ObjectRBTreeMap.findKey(Int2ObjectRBTreeMap.java:219)
at
it.unimi.dsi.fastutil.ints.Int2ObjectRBTreeMap.get(Int2ObjectRBTreeMap.java:931)
at
it.unimi.dsi.fastutil.ints.Int2ObjectMap.computeIfAbsent(Int2ObjectMap.java:380)
at
org.apache.druid.client.selector.ServerSelector.addServerAndUpdateSegment(ServerSelector.java:72)
```
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