[YARN-8223] ClassNotFoundException when auxiliary service is loaded from HDFS

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 3.2.0, 3.1.1
• Target Version/s: 3.2.0, 3.1.1
• Assignee: Zian Chen
• Reporter: Charan Hebri
• Created: 27/Apr/18 11:49
• Updated: 08/Nov/19 12:14
• Resolved: 04/May/18 16:39

Description

Loading an auxiliary jar from a local location on a node manager works as expected,

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"

But loading the same jar from a location on HDFS fails with a ClassNotFoundException.

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)

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. 

Issue Links

• breaks: MAPREDUCE-7170 Doc typo in PluggableShuffleAndPluggableSort.md
• is related to: YARN-9965 Fix NodeManager failing to start on subsequent times when Hdfs Auxillary Jar is set