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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-1641) auto-guessed memtable sizes are too high
Date Thu, 21 Oct 2010 05:28:16 GMT


Jonathan Ellis updated CASSANDRA-1641:

    Attachment: 1641.txt

I'd like to introduce a dependency on number of user CFs, but that's not available until after
we've picked a value.  So this cuts the size by half, which feels scientific because on the
old default 1GB heap size this gives us memtable throughput of 64MB, which is also the old

> auto-guessed memtable sizes are too high
> ----------------------------------------
>                 Key: CASSANDRA-1641
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7 beta 2
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 0.7.0
>         Attachments: 1641.txt
> I've seen two cases now of the memtable sizes being too large, causing OOMing.  Too-small
memtables hurt performance, but too-large hurts worse when you start GC storming.

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