[YARN-8445] YARN native service doesn't allow service name equals to component name

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1.1
• Assignee: Chandni Singh
• Reporter: Chandni Singh
• Created: 21/Jun/18 00:26
• Updated: 29/Jun/18 23:50
• Resolved: 21/Jun/18 15:22

Description

Now YARN service doesn't allow specifying service name equals to component name.

And it causes AM launch fails with msg like:

 
org.apache.hadoop.metrics2.MetricsException: Metrics source tf-zeppelin already exists!
 at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceName(DefaultMetricsSystem.java:152)
 at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName(DefaultMetricsSystem.java:125)
 at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:229)
 at org.apache.hadoop.yarn.service.ServiceMetrics.register(ServiceMetrics.java:75)
 at org.apache.hadoop.yarn.service.component.Component.<init>(Component.java:193)
 at org.apache.hadoop.yarn.service.ServiceScheduler.createAllComponents(ServiceScheduler.java:552)
 at org.apache.hadoop.yarn.service.ServiceScheduler.buildInstance(ServiceScheduler.java:251)
 at org.apache.hadoop.yarn.service.ServiceScheduler.serviceInit(ServiceScheduler.java:283)
 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.service.ServiceMaster.serviceInit(ServiceMaster.java:142)
 at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
 at org.apache.hadoop.yarn.service.ServiceMaster.main(ServiceMaster.java:338)
2018-06-18 06:50:39,473 [main] INFO service.ServiceScheduler - Stopping service scheduler

It's better to add this check in validation phase instead of failing AM.