ShiXing created HBASE-6589:
------------------------------
Summary: 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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