[jira] Updated: (CASSANDRA-1255) Explore interning keys and column names

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

     [ https://issues.apache.org/jira/browse/CASSANDRA-1255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-1255:
--------------------------------------

              Reviewer: stuhood
           Component/s: Core
              Priority: Minor  (was: Major)
         Fix Version/s: 0.7.1
    Remaining Estimate: 8h
     Original Estimate: 8h

> Explore interning keys and column names
> ---------------------------------------
>
>                 Key: CASSANDRA-1255
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1255
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stu Hood
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.7.1
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> With multiple Memtables, key caches and row caches holding DecoratedKey references, it could potentially be a huge memory savings (and relief to GC) to intern DecoratedKeys. Taking the idea farther, for the skinny row pattern, and for certain types of wide row patterns, interning of column names could be very beneficial as well (although we would need to wrap the byte[]s in something for hashCode/equals).
> This ticket should explore the benefits and overhead of interning.
> Google collections/guava MapMaker is a very convenient way to create this type of cache: example call: http://stackoverflow.com/questions/2865026/use-permgen-space-or-roll-my-own-intern-method/2865083#2865083

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