[jira] [Commented] (CASSANDRA-4324) Implement Lucene FST in for key index

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433526#comment-13433526 ] 

Jonathan Ellis commented on CASSANDRA-4324:
-------------------------------------------

bq. Looks like only SSTableReader calls IndexSummary#getKeys

Yes, although some uses, like the one in {{getKeySamples(Range)}}, are going to be tricky without an actual list of keys to work with.
                
> Implement Lucene FST in for key index
> -------------------------------------
>
>                 Key: CASSANDRA-4324
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4324
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jason Rutherglen
>            Assignee: Jason Rutherglen
>            Priority: Minor
>             Fix For: 1.2
>
>         Attachments: CASSANDRA-4324.patch, CASSANDRA-4324.patch, CASSANDRA-4324.patch, lucene-core-4.0-SNAPSHOT.jar
>
>
> The Lucene FST data structure offers a compact and fast system for indexing Cassandra keys.  More keys may be loaded which in turn should seeks faster.
> * Update the IndexSummary class to make use of the Lucene FST, overriding the serialization mechanism.
> * Alter SSTableReader to make use of the FST seek mechanism

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