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https://issues.apache.org/jira/browse/HBASE-6589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437567#comment-13437567
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Himanshu Vashishtha commented on HBASE-6589:
--------------------------------------------
Are you using HBASE-6308? If yes, then MultiColumnSchema should be loaded by
CoprocessorClassLoader. This error is when you try to invoke the CP, or the
loading itself?
> RegionServer can't load class for dynamically loaded coprocessors with self
> defined class
> -----------------------------------------------------------------------------------------
>
> Key: HBASE-6589
> URL: https://issues.apache.org/jira/browse/HBASE-6589
> Project: HBase
> Issue Type: Bug
> Components: coprocessors, regionserver
> Reporter: ShiXing
>
> When using coprocessor with custom classes like LongColumnInterpreter(mine is
> MultiColumnSchema), the coprocessor can not work for hot deploy, if the
> custom classes do not deploy in the regionserver's classpath. Although the
> self-defined class is deployed in the regions' classpath through hdfs jar.
> The exception threw at the regionserver's log:
> {code}
> 2012-08-15 16:24:24,403 ERROR org.apache.hadoop.hbase.io.HbaseObjectWritable:
> Error in readFields
> java.io.IOException: Can't find class
> com.taobao.hbase.coprocessor.MultiColumnSchema
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:674)
> at
> org.apache.hadoop.hbase.client.coprocessor.Exec.readFields(Exec.java:114)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:682)
> at
> org.apache.hadoop.hbase.ipc.Invocation.readFields(Invocation.java:125)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Connection.processData(HBaseServer.java:1292)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:1207)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:735)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.doRunLoop(HBaseServer.java:524)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:499)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> Caused by: java.lang.ClassNotFoundException:
> com.taobao.hbase.coprocessor.MultiColumnSchema
> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:247)
> at
> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:943)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.getClassByName(HbaseObjectWritable.java:784)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:671)
> ... 11 more
> {code}
> It is similar as HBASE-4946, but I do not know how to solve this bug.
> If add these custom class to the RegionServer's classloader may fix it, but
> it is conflicted with HBASE-6308 to prevent dependency conflicts.
> Does anyone have some idea?
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