Flaky test: SqlFirehoseFactoryTest.testWithoutCache

[paul-rogers]

This run failed in SqlFirehoseFactoryTest.testWithoutCache. Oddly, the PR in question doesn't even change existing code: it adds new code which is off by itself for the moment.

Failure:

[INFO] Running org.apache.druid.segment.realtime.firehose.SqlFirehoseFactoryTest
[ERROR] Tests run: 5, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 2.46 s <<< FAILURE! - in org.apache.druid.segment.realtime.firehose.SqlFirehoseFactoryTest
[ERROR] org.apache.druid.segment.realtime.firehose.SqlFirehoseFactoryTest.testWithoutCache  Time elapsed: 0.59 s  <<< ERROR!
java.lang.RuntimeException: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at org.apache.druid.segment.realtime.firehose.PrefetchSqlFirehoseFactory$2.next(PrefetchSqlFirehoseFactory.java:221)
	at org.apache.druid.segment.realtime.firehose.PrefetchSqlFirehoseFactory$2.next(PrefetchSqlFirehoseFactory.java:199)
	at org.apache.druid.segment.realtime.firehose.SqlFirehose.getNextLineIterator(SqlFirehose.java:84)
	at org.apache.druid.segment.realtime.firehose.SqlFirehose.hasMore(SqlFirehose.java:63)
	at org.apache.druid.segment.realtime.firehose.SqlFirehoseFactoryTest.testWithoutCache(SqlFirehoseFactoryTest.java:188)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	...
Caused by: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at org.apache.druid.data.input.impl.prefetch.Fetcher.checkFetchException(Fetcher.java:203)
	at org.apache.druid.data.input.impl.prefetch.Fetcher.next(Fetcher.java:174)
	at org.apache.druid.segment.realtime.firehose.PrefetchSqlFirehoseFactory$2.next(PrefetchSqlFirehoseFactory.java:216)
	... 35 more
Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
	at org.apache.druid.data.input.impl.prefetch.Fetcher.checkFetchException(Fetcher.java:194)
	... 37 more
Caused by: java.lang.NullPointerException
	at org.apache.druid.segment.realtime.firehose.SqlFetcher.download(SqlFetcher.java:82)
	at org.apache.druid.data.input.impl.prefetch.Fetcher.fetch(Fetcher.java:134)
	at org.apache.druid.data.input.impl.prefetch.Fetcher.lambda$fetchIfNeeded$0(Fetcher.java:110)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)

The cleanup also failed:

[ERROR] org.apache.druid.segment.realtime.firehose.SqlFirehoseFactoryTest  Time elapsed: 0.59 s  <<< ERROR!
java.io.FileNotFoundException: File does not exist: /tmp/SqlFirehoseFactoryTest1530634838652263350testWithoutCache
	at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:1349)
	at org.apache.druid.segment.realtime.firehose.SqlFirehoseFactoryTest.teardown(SqlFirehoseFactoryTest.java:92)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	...

[github-actions]

This issue has been marked as stale due to 280 days of inactivity.
It will be closed in 4 weeks if no further activity occurs. If this issue is still
relevant, please simply write any comment. Even if closed, you can still revive the
issue at any time or discuss it on the dev@druid.apache.org list.
Thank you for your contributions.

[github-actions]

This issue has been closed due to lack of activity. If you think that
is incorrect, or the issue requires additional review, you can revive the issue at
any time.