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https://issues.apache.org/jira/browse/TEZ-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacob Tolar updated TEZ-4084:
-----------------------------
Attachment: TEZ-4084.2.patch
> Tez local mode fails when distributed cache creates link with parent
> --------------------------------------------------------------------
>
> Key: TEZ-4084
> URL: https://issues.apache.org/jira/browse/TEZ-4084
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Jacob Tolar
> Assignee: Jacob Tolar
> Priority: Minor
> Attachments: TEZ-4084.1.patch, TEZ-4084.2.patch
>
>
> If you configure distributed cache with 'target#parent/link' in Tez Local
> Mode, the file cannot be created and the job fails:
> {code:java}
> java.lang.IllegalArgumentException: Invalid prefix or suffix
> at java.nio.file.TempFileHelper.generatePath(TempFileHelper.java:63)
> at java.nio.file.TempFileHelper.create(TempFileHelper.java:127)
> at
> java.nio.file.TempFileHelper.createTempDirectory(TempFileHelper.java:173)
> at java.nio.file.Files.createTempDirectory(Files.java:950)
> at
> org.apache.tez.dag.app.launcher.TezLocalCacheManager.localize(TezLocalCacheManager.java:103)
> {code}
>
> I propose:
> # Ensure the prefix is always valid (e.g. no path separators in it) when
> creating the temporary copy of the file in TezLocalCacheManager
> # Update tez local mode to behave the same way as mapreduce local mode in
> this scenario. Mapreduce local mode also doesn't support these types of links
> (links with a parent directory specified), but if it encounters them it is a
> soft failure (WARN log message) not a job failure.
>
> It is somewhat trickier to correctly support cache files linked with a
> nonexistent parent; if that feature is required it can be done as a separate
> JIRA.
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