Arena allocation causes excessive flushing on small heaps
---------------------------------------------------------
Key: CASSANDRA-3168
URL: https://issues.apache.org/jira/browse/CASSANDRA-3168
Project: Cassandra
Issue Type: Bug
Affects Versions: 1.0
Reporter: Jonathan Ellis
Assignee: Jonathan Ellis
Fix For: 1.0
adding allocator.size() to Memtable.getLiveSize has two problems:
1) it double-counts allocated parts of regions
2) it makes the size of an empty memtable the size of a single region
(2) is a particular problem because flushing a nearly-empty memtable will not
actually free up much memory -- we just trade one almost-empty region, for
another. In testing, I even saw this happening to the low-traffic system
tables like LocationInfo.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
