[jira] [Commented] (HBASE-15686) unable to dynamically load a table coprocessor if it belongs in org.apache.hadoop

["Ted Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-15686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15252590#comment-15252590 ] 

Ted Yu commented on HBASE-15686:
--------------------------------

bq. ability to exclude certain classes

How would such classes be defined ?

> unable to dynamically load a table coprocessor if it belongs in org.apache.hadoop
> ---------------------------------------------------------------------------------
>
>                 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
>
> 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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