[CASSANDRA-3162] use weak references to SlabAllocator regions

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Assignee: Jonathan Ellis
• Reporter: Jonathan Ellis

Authors

Jonathan Ellis

Reviewers

Stu Hood

• Created: 08/Sep/11 17:43
• Updated: 16/Apr/19 09:32
• Resolved: 08/Sep/11 19:51

Description

Yang points out on CASSANDRA-2252,

"Conceivably, one region would contain bytebuffer values of similar age. as more updates come in, all the columns in older regions are likely to have all died out, thus allowing us to free the entire region before flushing happens."

So it's a bit of a corner case optimization, but easy to do and safe.