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https://issues.apache.org/jira/browse/HDFS-16171?focusedWorklogId=637683&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-637683
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ASF GitHub Bot logged work on HDFS-16171:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Aug/21 05:02
Start Date: 13/Aug/21 05:02
Worklog Time Spent: 10m
Work Description: virajjasani edited a comment on pull request #3280:
URL: https://github.com/apache/hadoop/pull/3280#issuecomment-897418170
Thanks @ferhui for the review.
> This PR tile is different from HDFS-12188
Updated Jira title because testDecommissionStatus test is present in both
`TestDecommissioningStatus` and `TestDecommissioningStatusWithBackoffMonitor`,
hence by just mentioning testDecommissionStatus, we are taking care of both
tests failures.
> Do you explain why test is flaky and how you fix it?
The no of under-replicated blocks on DN2 can either be 3 or 4 depending on
actual blocks available in Datanode Storage. Hence, in order to make sure that
once both DN1 and DN2 are decommissioned -- we have 4 under replicated blocks
-- we need to first wait for total 8 blocks to be reported (including replicas)
by both DNs together. This is the additional check. Once we make sure of this,
we won't run in flaky test failures where sometimes due to 1 replica not being
reported even before we start decommissioning, we might run into case where we
can't asset all 4 blocks to be under replicated.
Hence, I have added additional validation before we start decommissioning
DN1.
> I see you add synchronized to some functions, Does it help to fix flaky
problems?
Good point, it doesn't solve flaky problem as of now. I just kept it while
running 2 tests in parallel so that config setup is synchronized but now it is
not required. I will remove it. Thanks
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Issue Time Tracking
-------------------
Worklog Id: (was: 637683)
Remaining Estimate: 0h
Time Spent: 10m
> testDecommissionStatus is flaky (for both TestDecommissioningStatus and
> TestDecommissioningStatusWithBackoffMonitor)
> --------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-16171
> URL: https://issues.apache.org/jira/browse/HDFS-16171
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> testDecommissionStatus keeps failing intermittently.
> {code:java}
> [ERROR]
> testDecommissionStatus(org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatusWithBackoffMonitor)
> Time elapsed: 3.299 s <<< FAILURE!
> java.lang.AssertionError: Unexpected num under-replicated blocks expected:<4>
> but was:<3>
> at org.junit.Assert.fail(Assert.java:89)
> at org.junit.Assert.failNotEquals(Assert.java:835)
> at org.junit.Assert.assertEquals(Assert.java:647)
> at
> org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatus.checkDecommissionStatus(TestDecommissioningStatus.java:169)
> at
> org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatusWithBackoffMonitor.testDecommissionStatus(TestDecommissioningStatusWithBackoffMonitor.java:136)
> {code}
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