[jira] [Resolved] (SPARK-26839) Work around classloader changes in Java 9 for Hive isolation

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-26839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun resolved SPARK-26839.
-----------------------------------
       Resolution: Fixed
         Assignee: Sean Owen
    Fix Version/s: 3.0.0

This is resolved via https://github.com/apache/spark/pull/24057

> Work around classloader changes in Java 9 for Hive isolation
> ------------------------------------------------------------
>
>                 Key: SPARK-26839
>                 URL: https://issues.apache.org/jira/browse/SPARK-26839
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Imran Rashid
>            Assignee: Sean Owen
>            Priority: Major
>             Fix For: 3.0.0
>
>
> This might be very specific to my fork & a kind of weird system setup I'm working on, I haven't completely confirmed yet, but I wanted to report it anyway in case anybody else sees this.
> When I try to do anything which touches the metastore on java11, I immediately get errors from IsolatedClientLoader that it can't load anything in java.sql.  eg.
> {noformat}
> scala> spark.sql("show tables").show()
> java.lang.ClassNotFoundException: java.lang.NoClassDefFoundError: java/sql/SQLTransientException when creating Hive client using classpath: file:/home/systest/jdk-11.0.2/, ...
> ...
> Caused by: java.lang.ClassNotFoundException: java.sql.SQLTransientException
>   at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
>   at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
>   at org.apache.spark.sql.hive.client.IsolatedClientLoader$$anon$1.doLoadClass(IsolatedClientLoader.scala:230)
>   at org.apache.spark.sql.hive.client.IsolatedClientLoader$$anon$1.loadClass(IsolatedClientLoader.scala:219)
>   at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
> {noformat}
> After a bit of debugging, I also discovered that the {{rootClassLoader}} is {{null}} in {{IsolatedClientLoader}}.  I think this would work if either {{rootClassLoader}} could load those classes, or if {{isShared()}} was changed to allow any class starting with "java."  (I'm not sure why it only allows "java.lang" and "java.net" currently.)



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