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From "Zian Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8223) ClassNotFoundException when auxiliary service is loaded from HDFS
Date Tue, 01 May 2018 18:19:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16459973#comment-16459973
] 

Zian Chen commented on YARN-8223:
---------------------------------

FYI, this change is actually covered by UT TestAuxServices#testRemoteAuxServiceClassPath

> ClassNotFoundException when auxiliary service is loaded from HDFS
> -----------------------------------------------------------------
>
>                 Key: YARN-8223
>                 URL: https://issues.apache.org/jira/browse/YARN-8223
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Charan Hebri
>            Assignee: Zian Chen
>            Priority: Blocker
>         Attachments: YARN-8223.001.patch
>
>
> Loading an auxiliary jar from a local location on a node manager works as expected,
> {noformat}
> 2018-04-26 15:09:26,179 INFO  util.ApplicationClassLoader (ApplicationClassLoader.java:<init>(98))
- classpath: [file:/grid/0/hadoop/yarn/local/aux-service-local.jar]
> 2018-04-26 15:09:26,179 INFO  util.ApplicationClassLoader (ApplicationClassLoader.java:<init>(99))
- system classes: [java., javax.accessibility., javax.activation., javax.activity., javax.annotation.,
javax.annotation.processing., javax.crypto., javax.imageio., javax.jws., javax.lang.model.,
-javax.management.j2ee., javax.management., javax.naming., javax.net., javax.print., javax.rmi.,
javax.script., -javax.security.auth.message., javax.security.auth., javax.security.cert.,
javax.security.sasl., javax.sound., javax.sql., javax.swing., javax.tools., javax.transaction.,
-javax.xml.registry., -javax.xml.rpc., javax.xml., org.w3c.dom., org.xml.sax., org.apache.commons.logging.,
org.apache.log4j., -org.apache.hadoop.hbase., org.apache.hadoop., core-default.xml, hdfs-default.xml,
mapred-default.xml, yarn-default.xml]
> 2018-04-26 15:09:26,181 INFO  containermanager.AuxServices (AuxServices.java:serviceInit(252))
- The aux service:test_aux_local are using the custom classloader
> 2018-04-26 15:09:26,182 WARN  containermanager.AuxServices (AuxServices.java:serviceInit(268))
- The Auxiliary Service named 'test_aux_local' in the configuration is for class org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxiliaryServiceWithCustomClassLoader
which has a name of 'org.apache.auxtest.AuxServiceFromLocal with custom class loader'. Because
these are not the same tools trying to send ServiceData and read Service Meta Data may have
issues unless the refer to the name in the config.
> 2018-04-26 15:09:26,182 INFO  containermanager.AuxServices (AuxServices.java:addService(103))
- Adding auxiliary service org.apache.auxtest.AuxServiceFromLocal with custom class loader,
"test_aux_local"{noformat}
> But loading the same jar from a location on HDFS fails with a ClassNotFoundException.
> {noformat}
> 018-04-26 15:14:39,683 INFO  util.ApplicationClassLoader (ApplicationClassLoader.java:<init>(98))
- classpath: []
> 2018-04-26 15:14:39,683 INFO  util.ApplicationClassLoader (ApplicationClassLoader.java:<init>(99))
- system classes: [java., javax.accessibility., javax.activation., javax.activity., javax.annotation.,
javax.annotation.processing., javax.crypto., javax.imageio., javax.jws., javax.lang.model.,
-javax.management.j2ee., javax.management., javax.naming., javax.net., javax.print., javax.rmi.,
javax.script., -javax.security.auth.message., javax.security.auth., javax.security.cert.,
javax.security.sasl., javax.sound., javax.sql., javax.swing., javax.tools., javax.transaction.,
-javax.xml.registry., -javax.xml.rpc., javax.xml., org.w3c.dom., org.xml.sax., org.apache.commons.logging.,
org.apache.log4j., -org.apache.hadoop.hbase., org.apache.hadoop., core-default.xml, hdfs-default.xml,
mapred-default.xml, yarn-default.xml]
> 2018-04-26 15:14:39,687 INFO  service.AbstractService (AbstractService.java:noteFailure(267))
- Service org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxServices failed in
state INITED
> java.lang.ClassNotFoundException: org.apache.auxtest.AuxServiceFromLocal
> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> 	at org.apache.hadoop.util.ApplicationClassLoader.loadClass(ApplicationClassLoader.java:189)
> 	at org.apache.hadoop.util.ApplicationClassLoader.loadClass(ApplicationClassLoader.java:157)
> 	at java.lang.Class.forName0(Native Method)
> 	at java.lang.Class.forName(Class.java:348)
> 	at org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxiliaryServiceWithCustomClassLoader.getInstance(AuxiliaryServiceWithCustomClassLoader.java:169)
> 	at org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxServices.serviceInit(AuxServices.java:249)
> 	at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
> 	at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:108)
> 	at org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl.serviceInit(ContainerManagerImpl.java:316)
> 	at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
> 	at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:108)
> 	at org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceInit(NodeManager.java:472)
> 	at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
> 	at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:918)
> 	at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:979)
> {noformat}
> The difference between the 2 logs is the classpath variable in the 1st line of the log
is empty in the HDFS case. It doesn't have the URL/filename of the jar file specified in the
config. 



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