Github user jaceklaskowski commented on the issue:
https://github.com/apache/spark/pull/17904
WFM. Thanks @ajbozarth!
```
$ git fetch origin pull/17904/head:17904
$ gco 17904
$ ./build/mvn -Phadoop-2.7,yarn,mesos,hive,hive-thriftserver -DskipTests
clean install
```
The following worked fine (http://localhost:4040/executors/):
```
$ ./bin/spark-shell
$ ./bin/spark-shell --conf spark.ui.threadDumpsEnabled=true
$ ./bin/spark-shell --conf spark.ui.threadDumpsEnabled=false
```
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