[HDFS-1350] make datanodes do graceful shutdown

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: datanode
• Assignee: sam rash
• Reporter: sam rash
• Created: 22/Aug/10 03:33
• Updated: 30/Jul/14 23:36
• Resolved: 30/Jul/14 23:36

Description

we found that the Datanode doesn't do a graceful shutdown and a block can be corrupted (data + checksum amounts off)

we can make the DN do a graceful shutdown in case there are open files. if this presents a problem to a timely shutdown, we can make a it a parameter of how long to wait for the full graceful shutdown before just exiting