[HBASE-2751] Consider closing StoreFiles sometimes

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Assignee: Unassigned
• Reporter: Jean-Daniel Cryans
• Created: 18/Jun/10 20:04
• Updated: 11/Jun/22 23:54
• Resolved: 08/Jun/14 21:58

Description

Having a lot of regions per region server could be considered harmless if most of them aren't used, but that's not really true at the moment. We keep all files opened all the time (except for rolled HLogs). I'm thinking of 2 solutions

1. Lazy open the store files, or at least close them down after we read the file info. Or we could do this for every file except the most recent one.
2. Close files when they're not in use. We need some heuristic to determine when is the best moment to declare that a file can be closed.

Both solutions go hand in hand, and I think it would be a huge gain in order to lower the ulimit and xceivers-related issues.

Issue Links

• is part of: HBASE-24 Scaling: Too many open file handles to datanodes