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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11110) Ability to load FilterList class is dependent on context classloader
Date Fri, 02 May 2014 06:53:16 GMT
Gabriel Reid created HBASE-11110:

             Summary: Ability to load FilterList class is dependent on context classloader
                 Key: HBASE-11110
                 URL: https://issues.apache.org/jira/browse/HBASE-11110
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.94.19
            Reporter: Gabriel Reid

In the 0.94 branch, the FilterList class contains a static call to HBaseConfiguration.create().
This create call in turn adds the needed hbase resources to the Configuration object, and
sets the classloader of the Configuration object to be the context classloader of the current
thread (if it isn't null).

This approach causes issues if the FilterList class is loaded from a thread that has a custom
context classloader that doesn't run back up to the main application classloader. In this
case, HBaseConfiguration.checkDefaultsVersion fails because the hbase.defaults.for.version
configuration value can't be found (because hbase-default.xml can't be found by the custom
context classloader).

This is a concrete issue that was discovered via Apache Phoenix within a commercial tool,
when a (JDBC) connection is opened via a pool, and then passed off to a UI thread that has
a custom context classloader. The UI thread is then the first thing to load FilterList, leading
to this issue.

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