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https://issues.apache.org/jira/browse/SPARK-20019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15931702#comment-15931702
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roncenzhao commented on SPARK-20019:
------------------------------------
The root cause of this exception is:
The `SessionState.addJar()` only set the new jarClassLoader into current thread
contextClassLoader and the classLoader of `sparkContext.hadoopConfiguration`
is the old one which does not include the new jar path.
In the function `InsertIntoHiveTable.getStagingDir()`, it throws the
`classNotFoundException` when `inputPath.getFileSystem(hadoopConf)` is called.
Because it loads the FileSystem using the `classLoader` of `hadoopConf`.
> spark can not load alluxio fileSystem after adding jar
> ------------------------------------------------------
>
> Key: SPARK-20019
> URL: https://issues.apache.org/jira/browse/SPARK-20019
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: roncenzhao
> Attachments: exception_stack.png
>
>
> The follwing sql cannot load alluxioSystem and it throws
> `ClassNotFoundException`.
> ```
> add jar /xxx/xxx/alluxioxxx.jar;
> set fs.alluxio.impl=alluxio.hadoop.FileSystem;
> select * from alluxionTbl;
> ```
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