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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15686) Add override mechanism for the exempt classes when dynamically loading table coprocessor
Date Thu, 28 Apr 2016 02:34:12 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-15686:
---------------------------
    Release Note: 
New coprocessor table descriptor attribute, hbase.coprocessor.classloader.included.classes,
is added.
User can specify class name prefixes (semicolon separated) which should be loaded by CoprocessorClassLoader
through this attribute using the following syntax:
{code}
  hbase> alter 't1',    'coprocessor'=>'hdfs:///foo.jar|com.foo.FooRegionObserver|1001|arg1=1,arg2=2'
{code}

  was:
New coprocessor table descriptor attribute, coprocessor.classloader.included.classes, is added.
User can specify class name prefixes (semicolon separated) which should be loaded by CoprocessorClassLoader
through this attribute using the following syntax:
{code}
  hbase> alter 't1',    'coprocessor'=>'hdfs:///foo.jar|com.foo.FooRegionObserver|1001|arg1=1,arg2=2'
{code}


> 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.v5.txt, 15686.v6.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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