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From "Sandeep Tata (JIRA)" <>
Subject [jira] Created: (CASSANDRA-16) Memory efficient compactions
Date Fri, 27 Mar 2009 01:12:50 GMT
Memory efficient compactions 

                 Key: CASSANDRA-16
             Project: Cassandra
          Issue Type: Improvement
         Environment: All
            Reporter: Sandeep Tata

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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