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https://issues.apache.org/jira/browse/HDFS-16498?focusedWorklogId=744875&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-744875
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ASF GitHub Bot logged work on HDFS-16498:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/Mar/22 08:24
Start Date: 21/Mar/22 08:24
Worklog Time Spent: 10m
Work Description: tomscut commented on pull request #4057:
URL: https://github.com/apache/hadoop/pull/4057#issuecomment-1073611615
> Had a quick look, prod change makes sense to me, the
`datanodeManager.getDatanode(nodeID)` methods shows it can register null, if
the node isn't found.
>
> The test is little complex and isn't showing some actual scenario. If this
issue is caused by some delay or race condition, will mocking something to
create some delays and so help?
>
> Try to get a test which shows the actual scenario, I found it really hard
to follow this test. If nothing helps, the worst would be add some comments
explaining things in details in the test
Thank you @ayushtkn very much for your review and detailed suggestions. I
will update the code.
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Issue Time Tracking
-------------------
Worklog Id: (was: 744875)
Time Spent: 2h 40m (was: 2.5h)
> Fix NPE for checkBlockReportLease
> ---------------------------------
>
> Key: HDFS-16498
> URL: https://issues.apache.org/jira/browse/HDFS-16498
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: tomscut
> Assignee: tomscut
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2022-03-09-20-35-22-028.png, screenshot-1.png
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> During the restart of Namenode, a Datanode is not registered, but this
> Datanode triggers FBR, which causes NPE.
> !image-2022-03-09-20-35-22-028.png|width=871,height=158!
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