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

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

     [ https://issues.apache.org/jira/browse/CASSANDRA-6078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleg Anastasyev updated CASSANDRA-6078:
---------------------------------------

    Attachment: Memtable-getLiveSize.diff
    
> 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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