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https://issues.apache.org/jira/browse/HBASE-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13509340#comment-13509340
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Ted Yu commented on HBASE-7205:
-------------------------------
{code}
public CoprocessorClassLoader(List<URL> paths, ClassLoader parent) {
super(paths.toArray(new URL[]{}), parent);
{code}
CoprocessorClassLoader is given a list of URLs.
{code}
synchronized public Class<?> loadClass(String name)
{code}
loadClass() delegates locating class to URLClassLoader.findClass().
Looks like we can extract the path where the class is actually loaded by
calling
http://docs.oracle.com/javase/6/docs/api/java/net/URLClassLoader.html#findResource%28java.lang.String%29.
> Coprocessor classloader is replicated for all regions in the HRegionServer
> --------------------------------------------------------------------------
>
> Key: HBASE-7205
> URL: https://issues.apache.org/jira/browse/HBASE-7205
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors
> Affects Versions: 0.92.2, 0.94.2
> Reporter: Adrian Muraru
> Priority: Critical
> Fix For: 0.96.0, 0.94.4
>
>
> HBASE-6308 introduced a new custom CoprocessorClassLoader to load the
> coprocessor classes and a new instance of this CL is created for each single
> HRegion opened. This leads to OOME-PermGen when the number of regions go
> above hundres / region server.
> Having the table coprocessor jailed in a separate classloader is good however
> we should create only one for all regions of a table in each HRS.
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