[HDFS-6970] Move startFile EDEK retries to the DFSClient

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.0
• Fix Version/s: 2.6.0
• Component/s: encryption
• Target Version/s: 2.6.0
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 29/Aug/14 00:13
• Updated: 01/Dec/14 03:10
• Resolved: 19/Sep/14 00:40

Description

sureshms pointed out that holding on to an RPC handler while talking to the KMS is bad, since it can exhaust the available handlers. Let's avoid this by doing retries at the DFSClient rather than in the RPC handler, and moving EDEK fetching to the background.