Michael Stack created HBASE-24068:
-------------------------------------
Summary: [Flakey Tests] TestServerSideScanMetricsFromClientSide
and NullPointerException
Key: HBASE-24068
URL: https://issues.apache.org/jira/browse/HBASE-24068
Project: HBase
Issue Type: Bug
Components: flakies
Reporter: Michael Stack
This fails for me locally sporadically.
{code}
-------------------------------------------------------------------------------
Test set: org.apache.hadoop.hbase.TestServerSideScanMetricsFromClientSide
-------------------------------------------------------------------------------
Tests run: 3, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.893 s <<<
FAILURE! - in org.apache.hadoop.hbase.TestServerSideScanMetricsFromClientSide
org.apache.hadoop.hbase.TestServerSideScanMetricsFromClientSide.testRowsSeenMetricWithAsync
Time elapsed: 0.325 s <<< ERROR!
java.lang.NullPointerException
{code}
Log pinpoints the problem a little better
{code}
Exception in thread "testTable.asyncPrefetcher" java.lang.NullPointerException
at
org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:183)
at java.lang.Thread.run(Thread.java:748)
java.lang.NullPointerException
at
org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:174)
at java.lang.Thread.run(Thread.java:748)
java.lang.NullPointerException
at
org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:174)
at java.lang.Thread.run(Thread.java:748)
2020-03-26 22:18:15,160 ERROR [Listener at localhost/53268]
hbase.TestServerSideScanMetricsFromClientSide(202): FAIL
java.lang.NullPointerException
at
org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner$PrefetchRunnable.run(ClientAsyncPrefetchScanner.java:174)
at java.lang.Thread.run(Thread.java:748)
{code}
It didn't make sense to me since complaint was about a 'lock' that is created
as a final data member. But then this issue happened for my compañero,
[~ndimiduk]... and he saw that the call is from a Thread inner class in this
class's grandparent that is set running on construction; i.e. the lock *could*
be null at the time of reference.
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