[HDFS-13892] Disk Balancer : Make execute command documentation better.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.2.0
• Component/s: diskbalancer, documentation
• Labels: newbie
• Hadoop Flags: Reviewed
• Assignee: Ranith Sardar
• Reporter: Harshakiran Reddy
• Created: 04/Sep/18 05:17
• Updated: 20/Sep/18 10:38
• Resolved: 20/Sep/18 03:51

Description

scenario:-

1. Write some 5GB data with one DISK
2. Add one more non-empty Disk to above Datanode
3.Run the plan command for the above specific datanode
4. run the Execute command with the above plan file
the above execute command not happened as per the datanode log

ERROR org.apache.hadoop.hdfs.server.datanode.DiskBalancer: Destination volume: file:/Test_Disk/DISK2/ does not have enough space to accommodate a block. Block Size: 268435456 Exiting from copyBlocks.

5. see the exit code for execute command, it display the 0

Expected Result :-

1. Exit code should be 1 why means execution was not happened
2. In this type of scenario In console print the that error message that time customer/user knows execute was not happened.