[YARN-4560] Make scheduler error checking message more user friendly

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 2.7.1
• Fix Version/s: 2.9.0, 3.0.0-alpha1
• Component/s: yarn
• Labels: supportability
• Hadoop Flags: Reviewed
• Assignee: Ray Chiang
• Reporter: Ray Chiang
• Created: 07/Jan/16 23:03
• Updated: 30/Aug/16 01:07
• Resolved: 16/Mar/16 06:50

Description

If the YARN properties below are poorly configured:

yarn.scheduler.minimum-allocation-mb
yarn.scheduler.maximum-allocation-mb

The error message that shows up in the RM is:

2016-01-07 14:47:03,711 FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error starting ResourceManager
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Invalid resource scheduler memory allocation configuration, yarn.scheduler.minimum-allocation-mb=-1, yarn.scheduler.maximum-allocation-mb=-3, min should equal greater than 0, max should be no smaller than min.
at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.validateConf(FairScheduler.java:215)

While it's technically correct, it's not very user friendly.