You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-dev@hadoop.apache.org by "Min Zhou (JIRA)" <ji...@apache.org> on 2012/05/29 10:27:24 UTC
[jira] [Created] (MAPREDUCE-4291) RpcServerFactoryPBImpl force yarn
users to define a protocol in a entailed namespace
Min Zhou created MAPREDUCE-4291:
-----------------------------------
Summary: RpcServerFactoryPBImpl force yarn users to define a protocol in a entailed namespace
Key: MAPREDUCE-4291
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4291
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 0.23.1, 0.24.0
Reporter: Min Zhou
We defined a wire protocol use protobuf with its java package name "org.apache.hadoop.realtime.proto"
{code:protobuf}
option java_package = "org.apache.hadoop.realtime.proto";
{code}
Such definition would cause a ClassNotFoundException when starting our customed application master.
{noformat}
12/05/29 14:45:33 ERROR app.DragonAppMaster: Error starting DragonAppMaster
org.apache.hadoop.yarn.YarnException: Failed to Start org.apache.hadoop.realtime.client.app.DragonAppMaster
at org.apache.hadoop.yarn.service.CompositeService.start(CompositeService.java:78)
at org.apache.hadoop.realtime.client.app.DragonAppMaster.start(DragonAppMaster.java:155)
at org.apache.hadoop.realtime.client.app.DragonAppMaster$1.run(DragonAppMaster.java:218)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1177)
at org.apache.hadoop.realtime.client.app.DragonAppMaster.initAndStartAppMaster(DragonAppMaster.java:214)
at org.apache.hadoop.realtime.client.app.DragonAppMaster.main(DragonAppMaster.java:200)
Caused by: org.apache.hadoop.yarn.YarnException: Failed to load class: [org.apache.hadoop.yarn.proto.DragonClientProtocol$DragonClientProtocolService]
at org.apache.hadoop.yarn.factories.impl.pb.RpcServerFactoryPBImpl.getServer(RpcServerFactoryPBImpl.java:105)
at org.apache.hadoop.yarn.ipc.HadoopYarnProtoRPC.getServer(HadoopYarnProtoRPC.java:63)
at org.apache.hadoop.realtime.client.DragonClientService.start(DragonClientService.java:134)
at org.apache.hadoop.yarn.service.CompositeService.start(CompositeService.java:68)
... 7 more
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.yarn.proto.DragonClientProtocol$DragonClientProtocolService
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1162)
at org.apache.hadoop.yarn.factories.impl.pb.RpcServerFactoryPBImpl.getServer(RpcServerFactoryPBImpl.java:103)
... 10 more
{noformat}
RpcServerFactoryPBImpl hard coded namespace suffix and class suffix of every protocol we defined. It force yarn users to define a protocol in a entailed namespace, below is some lines of RpcServerFactoryPBImpl.java that issues in the bug.
{code:java}
private static final String PROTO_GEN_PACKAGE_NAME = "org.apache.hadoop.yarn.proto";
private static final String PROTO_GEN_CLASS_SUFFIX = "Service";
private static final String PB_IMPL_PACKAGE_SUFFIX = "impl.pb.service";
private static final String PB_IMPL_CLASS_SUFFIX = "PBServiceImpl";
//...
private String getProtoClassName(Class<?> clazz) {
String srcClassName = getClassName(clazz);
return PROTO_GEN_PACKAGE_NAME + "." + srcClassName + "$" + srcClassName + PROTO_GEN_CLASS_SUFFIX;
}
{code}
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira