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https://issues.apache.org/jira/browse/YARN-8223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16463120#comment-16463120
]
Eric Yang commented on YARN-8223:
---------------------------------
[~Zian Chen] Thank you for the patch. This patch 001 works. At this time,
there is no documentation for how to load jar file from HDFS or local for aux
service. Could you add some information to:
hadoop/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/site/markdown/PluggableShuffleAndPluggableSort.md
Example of loading jar file from HDFS:
{code:java}
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle,AuxServiceFromHDFS</value>
</property>
<property>
<name>yarn.nodemanager.aux-services.AuxServiceFromHDFS.remote-classpath</name>
<value>/aux/test/aux-service-hdfs.jar</value>
</property>
<property>
<name>yarn.nodemanager.aux-services.AuxServiceFromHDFS.class</name>
<value>org.apache.auxtest.AuxServiceFromHDFS2</value>
</property>{code}
Example of loading jar file from local file system:
{code:java}
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle,AuxServiceFromHDFS</value>
</property>
<property>
<name>yarn.nodemanager.aux-services.AuxServiceFromHDFS.classpath</name>
<value>/aux/test/aux-service-hdfs.jar</value>
</property>
<property>
<name>yarn.nodemanager.aux-services.AuxServiceFromHDFS.class</name>
<value>org.apache.auxtest.AuxServiceFromHDFS2</value>
</property>{code}
This helps end user to understand the usage of the commands.
> 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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