use weak references to SlabAllocator regions
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Key: CASSANDRA-3162
URL: https://issues.apache.org/jira/browse/CASSANDRA-3162
Project: Cassandra
Issue Type: Improvement
Affects Versions: 1.0
Reporter: Jonathan Ellis
Assignee: Jonathan Ellis
Priority: Minor
Fix For: 1.0
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.
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