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https://issues.apache.org/jira/browse/HDFS-8915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Masatake Iwasaki updated HDFS-8915:
-----------------------------------
Attachment: HDFS-8915.002.patch
Thanks for checking.
HDFS-9139 added fix for the same purpose.
{code}
Thread.sleep(10); // Lets all threads get BLOCKED
{code}
Though the difference is just doing retry or not, I attached rebased patch.
> TestFSNamesystem.testFSLockGetWaiterCount fails intermittently in jenkins
> -------------------------------------------------------------------------
>
> Key: HDFS-8915
> URL: https://issues.apache.org/jira/browse/HDFS-8915
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: HDFS, test
> Affects Versions: 2.8.0
> Reporter: Anu Engineer
> Assignee: Masatake Iwasaki
> Attachments: HDFS-8915.001.patch, HDFS-8915.002.patch
>
>
> This test was added as part of HDFS-8883, There is a race condition in the
> test and it has failed *once* in the Apache Jenkins run.
> Here is the stack
> FAILED:
> org.apache.hadoop.hdfs.server.namenode.TestFSNamesystem.testFSLockGetWaiterCount
> Error Message:
> Expected number of blocked thread not found expected:<3> but was:<1>
> Stack Trace:
> java.lang.AssertionError: Expected number of blocked thread not found
> expected:<3> but was:<1>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.junit.Assert.assertEquals(Assert.java:555)
> at
> org.apache.hadoop.hdfs.server.namenode.TestFSNamesystem.testFSLockGetWaiterCount(TestFSNamesystem.java:261)
> From cursory code reading , even though we call into readlock.lock() there is
> no guarantee that our thread is put in the wait queue. A proposed fix could
> be to check for any thread in the lock queue instead of all 3, or disable the
> test.
> It could also indicate an issue with the test infra-structure but any test
> open to variations in result due to infra-structure issues creates noise in
> tests so we are better off fixing it.
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