Oleg Anastasyev created CASSANDRA-6078:
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Summary: Wrong memtable size estimation: liveRatio is not honored
in edge cases
Key: CASSANDRA-6078
URL: https://issues.apache.org/jira/browse/CASSANDRA-6078
Project: Cassandra
Issue Type: Bug
Reporter: Oleg Anastasyev
Attachments: Memtable-getLiveSize.diff
Memtable.getLiveSize does not honours liveRatio the correct way:
allocator.get**Size() return sizes allocated only by name and columns data
(i.e. no liveRatio applied); but conditions, which cap estimated size, compare
it with estimatedSize, already multiplied by liveRatio.
If liveRatio is big enough (i've seen >11 on our dataset), this leads to huge
estimation errors and even to OutOfMemory, because MeteredFlusher is
underestimates memtables sizes.
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