36df86c0d0
### What changes were proposed in this pull request?
This PR fixes `NullPointerException` in `LiveRDDDistribution.toApi`.
### Why are the changes needed?
Looking at the stack trace, the NPE is caused by the null `exec.hostPort`. I can't get the complete log to take a close look but only guess that it might be due to the event `SparkListenerBlockManagerAdded` is dropped or out of order.
```
21/08/23 12:26:29 ERROR AsyncEventQueue: Listener AppStatusListener threw an exception
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:192)
at com.google.common.collect.MapMakerInternalMap.putIfAbsent(MapMakerInternalMap.java:3507)
at com.google.common.collect.Interners$WeakInterner.intern(Interners.java:85)
at org.apache.spark.status.LiveEntityHelpers$.weakIntern(LiveEntity.scala:696)
at org.apache.spark.status.LiveRDDDistribution.toApi(LiveEntity.scala:563)
at org.apache.spark.status.LiveRDD.$anonfun$doUpdate$4(LiveEntity.scala:629)
at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238)
at scala.collection.mutable.HashMap$$anon$2.$anonfun$foreach$3(HashMap.scala:158)
at scala.collection.mutable.HashTable.foreachEntry(HashTable.scala:237)
at scala.collection.mutable.HashTable.foreachEntry$(HashTable.scala:230)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:44)
at scala.collection.mutable.HashMap$$anon$2.foreach(HashMap.scala:158)
at scala.collection.TraversableLike.map(TraversableLike.scala:238)
at scala.collection.TraversableLike.map$(TraversableLike.scala:231)
at scala.collection.AbstractTraversable.map(Traversable.scala:108)
at org.apache.spark.status.LiveRDD.doUpdate(LiveEntity.scala:629)
at org.apache.spark.status.LiveEntity.write(LiveEntity.scala:51)
at org.apache.spark.status.AppStatusListener.update(AppStatusListener.scala:1206)
at org.apache.spark.status.AppStatusListener.maybeUpdate(AppStatusListener.scala:1212)
at org.apache.spark.status.AppStatusListener.$anonfun$onExecutorMetricsUpdate$6(AppStatusListener.scala:956)
...
```
### Does this PR introduce _any_ user-facing change?
Yes, users will see the expected RDD info in UI instead of the NPE error.
### How was this patch tested?
Pass existing tests.
Closes #33812 from Ngone51/fix-hostport-npe.
Authored-by: yi.wu <yi.wu@databricks.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
(cherry picked from commit
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