yaooqinn opened a new pull request, #46270:
URL: https://github.com/apache/spark/pull/46270
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### What changes were proposed in this pull request?
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This PR fixes an NPE in MapStatusesSerDeserBenchmark. The cause is that we
try to stop the tracker twice.
```
3197java.lang.NullPointerException: Cannot invoke
"org.apache.spark.rpc.RpcEndpointRef.askSync(Object, scala.reflect.ClassTag)"
because the return value of
"org.apache.spark.MapOutputTracker.trackerEndpoint()" is null
3198 at
org.apache.spark.MapOutputTracker.askTracker(MapOutputTracker.scala:541)
3199 at
org.apache.spark.MapOutputTracker.sendTracker(MapOutputTracker.scala:551)
3200 at
org.apache.spark.MapOutputTrackerMaster.stop(MapOutputTracker.scala:1242)
3201 at org.apache.spark.SparkEnv.stop(SparkEnv.scala:112)
3202 at
org.apache.spark.SparkContext.$anonfun$stop$25(SparkContext.scala:2354)
3203 at org.apache.spark.util.Utils$.tryLogNonFatalError(Utils.scala:1294)
3204 at org.apache.spark.SparkContext.stop(SparkContext.scala:2354)
3205 at org.apache.spark.SparkContext.stop(SparkContext.scala:2259)
3206 at
org.apache.spark.MapStatusesSerDeserBenchmark$.afterAll(MapStatusesSerDeserBenchmark.scala:128)
3207 at org.apache.spark.benchmark.BenchmarkBase.main(BenchmarkBase.scala:80)
3208 at
org.apache.spark.MapStatusesSerDeserBenchmark.main(MapStatusesSerDeserBenchmark.scala)
3209 at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
3210 at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
3211 at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
3212 at java.base/java.lang.reflect.Method.invoke(Method.java:568)
3213 at
org.apache.spark.benchmark.Benchmarks$.$anonfun$main$7(Benchmarks.scala:128)
3214 at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
3215 at org.apache.spark.benchmark.Benchmarks$.main(Benchmarks.scala:91)
3216 at org.apache.spark.benchmark.Benchmarks.main(Benchmarks.scala)
```
### Why are the changes needed?
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test bugfix
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no
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manually
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