[HDFS-3048] Small race in BlockManager#close

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0-alpha
• Fix Version/s: 2.0.2-alpha
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Andy Isaacson
• Reporter: Eli Collins
• Created: 05/Mar/12 20:21
• Updated: 11/Oct/12 17:46
• Resolved: 15/Aug/12 22:45

Description

There's a small race in BlockManager#close, we close the BlocksMap before the replication monitor, which means the replication monitor can NPE if it tries to access the blocks map. We need to swap the order (close the blocks map after shutting down the repl monitor).

Issue Links

• is duplicated by: HDFS-3787 BlockManager#close races with ReplicationMonitor#run
• is related to: HDFS-3664 BlockManager race when stopping active services