Wellington Chevreuil created HBASE-28894:
--------------------------------------------
Summary: Test
Key: HBASE-28894
URL: https://issues.apache.org/jira/browse/HBASE-28894
Project: HBase
Issue Type: Bug
Reporter: Wellington Chevreuil
Assignee: Wellington Chevreuil
I'm seeing some failures on TestPrefetch.testPrefetchWithDelay in some
pre-commit runs, I believe this is a flakey.
In these failures, it seems we are getting the NPE below:
{noformat}
Stacktracejava.lang.NullPointerException
at
java.util.concurrent.ConcurrentSkipListMap.put(ConcurrentSkipListMap.java:1580)
at
org.apache.hadoop.hbase.io.hfile.PrefetchExecutor.request(PrefetchExecutor.java:108)
at
org.apache.hadoop.hbase.io.hfile.PrefetchExecutor.lambda$loadConfiguration$0(PrefetchExecutor.java:206)
at
java.util.concurrent.ConcurrentSkipListMap.forEach(ConcurrentSkipListMap.java:3269)
at
org.apache.hadoop.hbase.io.hfile.PrefetchExecutor.loadConfiguration(PrefetchExecutor.java:200)
at
org.apache.hadoop.hbase.regionserver.PrefetchExecutorNotifier.onConfigurationChange(PrefetchExecutorNotifier.java:51)
at
org.apache.hadoop.hbase.io.hfile.TestPrefetch.testPrefetchWithDelay(TestPrefetch.java:378)
{noformat}
I think this is because we are completing prefetch in this test before the
induced delay, then this test triggers a new configuration change, but the
prefetch thread calls PrefetchExecutor.complete just before the test thread
reaches [this
point|https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/PrefetchExecutor.java#L206]:
{noformat}
2024-10-01T11:28:10,660 DEBUG [Time-limited test {}]
hfile.PrefetchExecutor(102): Prefetch requested for
/home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-6328/yetus-jdk8-hadoop2-check/src/hbase-server/target/test-data/b646497b-7616-6533-e8cb-98e5c9e2e083/TestPrefetchWithDelay/71eefdb271ae4f65b694a6ec3d4287a0,
delay=25000 ms
2024-10-01T11:28:30,668 INFO [Time-limited test {}] hbase.Waiter(181): Waiting
up to [10,000] milli-secs(wait.for.ratio=[1])
2024-10-01T11:28:35,661 DEBUG [hfile-prefetch-1727782088576 {}]
hfile.HFilePreadReader$1(103): No entry in the backing map for cache key
71eefdb271ae4f65b694a6ec3d4287a0_0.
...
2024-10-01T11:28:35,673 DEBUG [hfile-prefetch-1727782088576 {}]
hfile.HFilePreadReader$1(103): No entry in the backing map for cache key
71eefdb271ae4f65b694a6ec3d4287a0_52849.
2024-10-01T11:28:35,674 DEBUG [Time-limited test {}]
hfile.PrefetchExecutor(142): Prefetch cancelled for
/home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-6328/yetus-jdk8-hadoop2-check/src/hbase-server/target/test-data/b646497b-7616-6533-e8cb-98e5c9e2e083/TestPrefetchWithDelay/71eefdb271ae4f65b694a6ec3d4287a0
2024-10-01T11:28:35,674 DEBUG [hfile-prefetch-1727782088576 {}]
hfile.PrefetchExecutor(121): Prefetch completed for
71eefdb271ae4f65b694a6ec3d4287a0
2024-10-01T11:28:35,674 DEBUG [Time-limited test {}]
hfile.PrefetchExecutor(102): Prefetch requested for
/home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-6328/yetus-jdk8-hadoop2-check/src/hbase-server/target/test-data/b646497b-7616-6533-e8cb-98e5c9e2e083/TestPrefetchWithDelay/71eefdb271ae4f65b694a6ec3d4287a0,
delay=991 ms
...
{noformat}
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