[jira] [Created] (CASSANDRA-6078) Wrong memtable size estimation: liveRatio is not honored in edge cases

["Oleg Anastasyev (JIRA)" <ji...@apache.org>]

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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