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https://issues.apache.org/jira/browse/HBASE-15686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15260590#comment-15260590
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Enis Soztutar commented on HBASE-15686:
---------------------------------------
This will be typed once in the lifetime of the code. It is much more important
keep our naming consistent. ALL coprocessor configs already start with
"hbase.coprocessor", no need to create more confusion. We are spending more
time discussing this then once or twice this will be actually typed.
> Add override mechanism for the exempt classes when dynamically loading table
> coprocessor
> ----------------------------------------------------------------------------------------
>
> Key: HBASE-15686
> URL: https://issues.apache.org/jira/browse/HBASE-15686
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors
> Affects Versions: 1.0.1
> Reporter: Sangjin Lee
> Assignee: Ted Yu
> Attachments: 15686.v2.txt, 15686.v3.txt, 15686.v4.txt, 15686.wip
>
>
> As part of Hadoop's Timeline Service v.2 (YARN-2928), we're adding a table
> coprocessor (YARN-4062). However, we're finding that the coprocessor cannot
> be loaded dynamically. A relevant snippet for the exception:
> {noformat}
> java.io.IOException: Class
> org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunCoprocessor
> cannot be loaded
> at
> org.apache.hadoop.hbase.master.HMaster.sanityCheckTableDescriptor(HMaster.java:1329)
> at org.apache.hadoop.hbase.master.HMaster.createTable(HMaster.java:1269)
> at
> org.apache.hadoop.hbase.master.MasterRpcServices.createTable(MasterRpcServices.java:398)
> at
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:42436)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2031)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: Class
> org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunCoprocessor
> cannot be loaded
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.testTableCoprocessorAttrs(RegionCoprocessorHost.java:324)
> at
> org.apache.hadoop.hbase.master.HMaster.checkClassLoading(HMaster.java:1483)
> at
> org.apache.hadoop.hbase.master.HMaster.sanityCheckTableDescriptor(HMaster.java:1327)
> ... 8 more
> Caused by: java.lang.ClassNotFoundException:
> org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunCoprocessor
> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at
> org.apache.hadoop.hbase.util.CoprocessorClassLoader.loadClass(CoprocessorClassLoader.java:275)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.testTableCoprocessorAttrs(RegionCoprocessorHost.java:322)
> ... 10 more
> {noformat}
> We tracked it down to the fact that {{CoprocessorClassLoader}} regarding all
> hadoop classes as exempt from loading from the coprocessor jar. Since our
> coprocessor sits in the coprocessor jar, and yet the loading of this class is
> delegated to the parent which does not have this jar, the classloading fails.
> What would be nice is the ability to exclude certain classes from the exempt
> classes so that they can be loaded via table coprocessor classloader. See
> hadoop's {{ApplicationClassLoader}} for a similar feature.
> Is there any other way to load this coprocessor at the table scope?
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