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https://issues.apache.org/jira/browse/HADOOP-19290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17885282#comment-17885282
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ASF GitHub Bot commented on HADOOP-19290:
-----------------------------------------
ayushtkn opened a new pull request, #7074:
URL: https://github.com/apache/hadoop/pull/7074
### Description of PR
Avoid fetching the checksum file for /, / is a directory anyway we don't
have checksum files for directories & parent of root is ``null`` which leads to
``NPE`` failing the entire call
### How was this patch tested?
UT
### For code changes:
- [x] 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?
> Operating on / in ChecksumFileSystem throws NPE
> -----------------------------------------------
>
> Key: HADOOP-19290
> URL: https://issues.apache.org/jira/browse/HADOOP-19290
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Ayush Saxena
> Assignee: Ayush Saxena
> Priority: Major
>
> Operating on / on ChecksumFileSystem throws NPE
> {noformat}
> java.lang.NullPointerException
> at org.apache.hadoop.fs.Path.<init>(Path.java:151)
> at org.apache.hadoop.fs.Path.<init>(Path.java:130)
> at
> org.apache.hadoop.fs.ChecksumFileSystem.getChecksumFile(ChecksumFileSystem.java:121)
> at
> org.apache.hadoop.fs.ChecksumFileSystem$FsOperation.run(ChecksumFileSystem.java:774)
> at
> org.apache.hadoop.fs.ChecksumFileSystem.setReplication(ChecksumFileSystem.java:884)
> {noformat}
> Internally I observed it for SetPermission but on my Mac LocalFs doesn't let
> me setPermission on "/", so I reproduced it via SetReplication which goes
> through the same code path
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