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https://issues.apache.org/jira/browse/HDFS-16244?focusedWorklogId=657055&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-657055
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ASF GitHub Bot logged work on HDFS-16244:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 29/Sep/21 08:33
Start Date: 29/Sep/21 08:33
Worklog Time Spent: 10m
Work Description: jianghuazhu opened a new pull request #3497:
URL: https://github.com/apache/hadoop/pull/3497
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### Description of PR
In Checkpointer#doCheckpoint(), when you need to execute
reloadFromImageFile(), you need to add the necessary write lock.
### How was this patch tested?
Need to verify the correctness of Checkpointer#doCheckpoint().
### For code changes:
- [ ] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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Issue Time Tracking
-------------------
Worklog Id: (was: 657055)
Remaining Estimate: 0h
Time Spent: 10m
> Add the necessary write lock in Checkpointer#doCheckpoint()
> -----------------------------------------------------------
>
> Key: HDFS-16244
> URL: https://issues.apache.org/jira/browse/HDFS-16244
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: JiangHua Zhu
> Assignee: JiangHua Zhu
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When BackupNode is enabled, Checkpointer#doCheckpoint() will start to work.
> When the image file needs to be reloaded, there is a call link, for example:
> FSImage#reloadFromImageFile()->FSNamesystem#clear()->FSDirectory#reset().
> In FSDirectory#reset(), the write lock needs to be acquired in advance, for
> example:
> void reset() {
> writeLock();
> try {
> ......
> } finally {
> writeUnlock();
> }
> }
> However, no write lock has been acquired before this.
> You will get an exception message at this time, for example:
> java.lang.AssertionError: Should hold namesystem write lock
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