Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18283
@felixcheung I'm seeing different failures; are these real failures or
something wrong with the machine? It happened twice, FWIW:
```
/home/jenkins/workspace/spark-master-test-sbt-hadoop-2.7/R/install-dev.sh:
line 47: jar: command not found
[error] running
/home/jenkins/workspace/spark-master-test-sbt-hadoop-2.7/R/install-dev.sh ;
received return code 127
Build step 'Execute shell' marked build as failure
Archiving artifacts
Recording test results
ERROR: Step ?Publish JUnit test result report? failed: No test report files
were found. Configuration error?
Finished: FAILURE
```
https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-master-test-sbt-hadoop-2.7/3031/console
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