[HADOOP-15784] Tracing in Hadoop failed because of Unknown protocol: org.apache.hadoop.tracing.TraceAdminPB.TraceAdminService

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.8.2
• Component/s: tracing
• Assignee: yunfei liu
• Reporter: yunfei liu
• Created: 25/Sep/18 03:06
• Updated: 16/Aug/19 02:00

Description

I'm trying to use tracing feature in Hadoop according to this document Enabling Dapper-like Tracing in Hadoop

when executing command

hadoop trace -list -host localhost:8020

it failed with exception

Exception in thread "main" org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.authorize.AuthorizationException): Unknown protocol: org.apache.hadoop.tracing.TraceAdminPB.TraceAdminService
	at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1495)
	at org.apache.hadoop.ipc.Client.call(Client.java:1441)
	at org.apache.hadoop.ipc.Client.call(Client.java:1351)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:235)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
	at com.sun.proxy.$Proxy8.listSpanReceivers(Unknown Source)
	at org.apache.hadoop.tracing.TraceAdminProtocolTranslatorPB.listSpanReceivers(TraceAdminProtocolTranslatorPB.java:59)
	at org.apache.hadoop.tracing.TraceAdmin.listSpanReceivers(TraceAdmin.java:73)
	at org.apache.hadoop.tracing.TraceAdmin.run(TraceAdmin.java:192)
	at org.apache.hadoop.tracing.TraceAdmin.main(TraceAdmin.java:210)

after examining the source code , I change the protocalName in TraceAdminProtocolPB.java from org.apache.hadoop.tracing.TraceAdminPB.TraceAdminService to org.apache.hadoop.tracing.TraceAdminProtocol , and the tracing function finally work well

[hdfs@yunfeil ~]$ hadoop trace -list -host localhost:8020
ID  CLASS                                     
1   org.apache.htrace.impl.ZipkinSpanReceiver 

the code change is as the patch