[HDFS-6247] Avoid timeouts for replaceBlock() call by sending intermediate responses to Balancer

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.6.0
• Component/s: balancer & mover, datanode
• Hadoop Flags: Reviewed
• Assignee: Vinayakumar B
• Reporter: Vinayakumar B
• Created: 15/Apr/14 17:05
• Updated: 01/Dec/14 03:09
• Resolved: 13/Aug/14 18:10

Description

Currently there is no response sent from target Datanode to Balancer for the replaceBlock() calls.

Since the Block movement for balancing is throttled, complete block movement will take time and this could result in timeout at Balancer, which will be trying to read the status message.

To Avoid this during replaceBlock() call in in progress Datanode can send IN_PROGRESS status messages to Balancer to avoid timeouts and treat BlockMovement as failed.