[jira] Updated: (CASSANDRA-16) Memory efficient compactions

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-16?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-16:
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    Priority: Critical  (was: Major)

> Memory efficient compactions 
> -----------------------------
>
>                 Key: CASSANDRA-16
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16
>             Project: Cassandra
>          Issue Type: Improvement
>         Environment: All
>            Reporter: Sandeep Tata
>            Priority: Critical
>             Fix For: 0.4
>
>
> The basic idea is to allow rows to get large enough that they don't have to fit in memory entirely, but can easily fit on a disk. The compaction algorithm today de-serializes the entire row in memory before writing out the compacted SSTable (see ColumnFamilyStore.doCompaction() and associated methods).
> The requirement is to have a compaction method with a lower memory requirement so we can support rows larger than available main memory. To re-use the old FB example, if we stored a user's inbox in a row, we'd want the inbox to grow bigger than memory so long as it fit on disk.

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