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Posted to issues@spark.apache.org by "Zikun (Jira)" <ji...@apache.org> on 2021/08/12 13:00:03 UTC
[jira] [Commented] (SPARK-36493) SparkFiles.get is not needed for
the JDBC keytab provided by the "--files" option
[ https://issues.apache.org/jira/browse/SPARK-36493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17398051#comment-17398051 ]
Zikun commented on SPARK-36493:
-------------------------------
A PR is submitted for this issue
https://github.com/apache/spark/pull/33726
> SparkFiles.get is not needed for the JDBC keytab provided by the "--files" option
> ---------------------------------------------------------------------------------
>
> Key: SPARK-36493
> URL: https://issues.apache.org/jira/browse/SPARK-36493
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.1.0, 3.1.2
> Reporter: Zikun
> Priority: Major
> Fix For: 3.1.3
>
>
> Currently we have the logic to deal with the JDBC keytab provided by the "--files" option
> if (keytabParam != null && FilenameUtils.getPath(keytabParam).isEmpty)
> { val result = SparkFiles.get(keytabParam)
> logDebug(s"Keytab path not found, assuming --files, file name used on executor: $result")
> result }
> Spark has already created the soft link for any file submitted by the "--files" option. Here is an example.
> testusera1.keytab -> /var/opt/hadoop/temp/nm-local-dir/usercache/testusera1/appcache/application_1628584679772_0003/filecache/12/testusera1.keytab
>
> So there is no need to call the SparkFiles.get to absolute path of the keytab file. We can directly use the variable `keytabParam` as the keytab file path.
>
> Moreover, SparkFiles.get will get a wrong path of keytab. In a running Spark cluster, the keytab is distributed to the following location
> /var/opt/hadoop/temp/nm-local-dir/usercache/testusera1/appcache/application_1628584679772_0003/filecache/12/testusera1.keytab
> but SparkFiles.get brings the following wrong location
> /var/opt/hadoop/temp/nm-local-dir/usercache/testusera1/appcache/application_1628584679772_0003/spark-8fb0f437-c842-4a9f-9612-39de40082e40/userFiles-5075388b-0928-4bc3-a498-7f6c84b27808/testusera1.keytab
>
>
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