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https://issues.apache.org/jira/browse/HBASE-27732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17910751#comment-17910751
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Wei-Chiu Chuang commented on HBASE-27732:
-----------------------------------------
For posterity, this is not a test issue, rather, it fixes a data race in the
production code.
The gist of issue is that the WAL file would occasionally be renamed while
open. This is not an issue for HDFS because HDFS allows this semantics but it
fails later with the NPE. For Ozone, because Ozone does not yet support
renaming open files, HBase would crash immediately.
> NPE in TestBasicWALEntryStreamFSHLog.testEOFExceptionInOldWALsDirectory
> -----------------------------------------------------------------------
>
> Key: HBASE-27732
> URL: https://issues.apache.org/jira/browse/HBASE-27732
> Project: HBase
> Issue Type: Bug
> Components: Replication
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Major
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.4.17, 2.5.4
>
>
> https://ci-hbase.apache.org/job/HBase-Flaky-Tests/job/master/7985/testReport/junit/org.apache.hadoop.hbase.replication.regionserver/TestBasicWALEntryStreamFSHLog/testEOFExceptionInOldWALsDirectory_1__isCompressionEnabled_true_/
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.wal.AbstractFSWALProvider.findArchivedLog(AbstractFSWALProvider.java:488)
> at
> org.apache.hadoop.hbase.replication.regionserver.TestBasicWALEntryStream.testEOFExceptionInOldWALsDirectory(TestBasicWALEntryStream.java:771)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
> at
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
> at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:61)
> at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
> at
> org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
> at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
> at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
> at org.junit.runners.Suite.runChild(Suite.java:128)
> at org.junit.runners.Suite.runChild(Suite.java:27)
> at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
> at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
> at
> org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
> at
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
> at
> org.apache.hadoop.hbase.SystemExitRule$1.evaluate(SystemExitRule.java:39)
> at
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
> at
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at java.lang.Thread.run(Thread.java:750)
> {noformat}
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