[YARN-4246] NPE while listing app attempt

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Hadoop Flags: Reviewed
• Assignee: nijel
• Reporter: Varun Saxena
• Created: 09/Oct/15 11:03
• Updated: 30/Aug/16 01:15
• Resolved: 26/Oct/15 06:40

Description

Exception in thread "main" java.lang.NullPointerException
at org.apache.hadoop.yarn.client.cli.ApplicationCLI.listApplicationAttempts(ApplicationCLI.java:669)
at org.apache.hadoop.yarn.client.cli.ApplicationCLI.run(ApplicationCLI.java:233)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
at org.apache.hadoop.yarn.client.cli.ApplicationCLI.main(ApplicationCLI.java:89)

This is because AM container id can be null if AM container hasnt been allocated. In ApplicationCLI#listApplicationAttempts we should check whether AM container ID is null instead of directly calling toString.

      writer.printf(APPLICATION_ATTEMPTS_PATTERN, appAttemptReport
          .getApplicationAttemptId(), appAttemptReport
          .getYarnApplicationAttemptState(), appAttemptReport
          .getAMContainerId().toString(), appAttemptReport.getTrackingUrl());