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https://issues.apache.org/jira/browse/MAPREDUCE-7454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763698#comment-17763698
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ASF GitHub Bot commented on MAPREDUCE-7454:
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teamconfx opened a new pull request, #6049:
URL: https://github.com/apache/hadoop/pull/6049
### Description of PR
https://issues.apache.org/jira/browse/MAPREDUCE-7454
This PR adds a nullity check for the jobId when trying to acquire the appId,
and also when trying to initialize the shared cache.
### How was this patch tested?
1. set `mapreduce.job.sharedcache.mode=archives,
mapreduce.framework.name=yarn, yarn.sharedcache.enabled=true`
2. run
`org.apache.hadoop.mapreduce.TestJobResourceUploader#testErasureCodingDisabled`
The test does not throw `NullPointerException` any more, and gives more
information about what is the problem.
### 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?
> missing checking for null when acquiring appId for a null jobId
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-7454
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7454
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: ConfX
> Priority: Critical
> Attachments: reproduce.sh
>
>
> h2. What happened?
> null pointer exception is triggered when trying to acquire appId for a null
> jobId
> h2. Where's the bug?
> In line 90 of JobResourceUploader.java:
> {code:java}
> private ApplicationId jobIDToAppId(JobID jobId) {
> return ApplicationId.newInstance(Long.parseLong(jobId.getJtIdentifier()),
> jobId.getId());
> }
> {code}
> Here the jobId is not checked before generating the `ApplicationId` for it.
> h2. How to reproduce?
> 1. set {{mapreduce.job.sharedcache.mode=archives,
> mapreduce.framework.name=yarn, yarn.sharedcache.enabled=true}}
> 2. run
> {{org.apache.hadoop.mapreduce.TestJobResourceUploader#testErasureCodingDisabled}}
> and observe this exception:
> {code:java}
> java.lang.NullPointerException
> at
> org.apache.hadoop.mapreduce.JobResourceUploader.jobIDToAppId(JobResourceUploader.java:91)
> at
> org.apache.hadoop.mapreduce.JobResourceUploader.initSharedCache(JobResourceUploader.java:79)
> at
> org.apache.hadoop.mapreduce.JobResourceUploader.uploadResources(JobResourceUploader.java:134)
> at
> org.apache.hadoop.mapreduce.TestJobResourceUploader.testErasureCodingSetting(TestJobResourceUploader.java:442)
> at
> org.apache.hadoop.mapreduce.TestJobResourceUploader.testErasureCodingDisabled(TestJobResourceUploader.java:380)
> {code}
> For an easy reproduction, run the {{reproduce.sh}} in the attachment.
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