[YARN-1131] $yarn logs command should return an appropriate error message if YARN application is still running

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.1.1-beta
• Fix Version/s: 2.2.0
• Component/s: client
• Target Version/s: 2.2.0
• Assignee: Siddharth Seth
• Reporter: Tassapol Athiapinya
• Created: 30/Aug/13 22:17
• Updated: 25/Oct/19 20:26
• Resolved: 04/Oct/13 02:48

Description

In the case when log aggregation is enabled, if a user submits MapReduce job and runs $ yarn logs -applicationId <app ID> while the YARN application is running, the command will return no message and return user back to shell. It is nice to tell the user that log aggregation is in progress.

-bash-4.1$ /usr/bin/yarn logs -applicationId application_1377900193583_0002
-bash-4.1$

At the same time, if invalid application ID is given, YARN CLI should say that the application ID is incorrect rather than throwing NoSuchElementException.

$ /usr/bin/yarn logs -applicationId application_00000
Exception in thread "main" java.util.NoSuchElementException
at com.google.common.base.AbstractIterator.next(AbstractIterator.java:75)
at org.apache.hadoop.yarn.util.ConverterUtils.toApplicationId(ConverterUtils.java:124)
at org.apache.hadoop.yarn.util.ConverterUtils.toApplicationId(ConverterUtils.java:119)
at org.apache.hadoop.yarn.logaggregation.LogDumper.run(LogDumper.java:110)
at org.apache.hadoop.yarn.logaggregation.LogDumper.main(LogDumper.java:255)