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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (CASSANDRA-1472) Add bitmap secondary indexes
Date Mon, 06 Jun 2011 19:46:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045042#comment-13045042
] 

Stu Hood edited comment on CASSANDRA-1472 at 6/6/11 7:45 PM:
-------------------------------------------------------------

By returning the row as a probable match, and resolving using the base data (the brute force
filtering): this is why -it- reads are less performant for high update ratios.

With the timestamp work from CASSANDRA-2498, we'd be able to push slightly more down to this
index (especially if we added timestamps to it). If we matched a particular sstable with the
index, and the match has a higher timestamp than any other file, then we can return immediately
with 2498.

      was (Author: stuhood):
    By returning the row as a probable match, and resolving using the base data (the brute
force filtering): this is why it is less performant for high update ratios.

With the timestamp work from CASSANDRA-2498, we'd be able to push slightly more down to this
index (especially if we added timestamps to it). If we matched a particular sstable with the
index, and the match has a higher timestamp than any other file, then we can return immediately
with 2498.
  
> Add bitmap secondary indexes
> ----------------------------
>
>                 Key: CASSANDRA-1472
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1472
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stu Hood
>            Assignee: Stu Hood
>             Fix For: 1.0
>
>         Attachments: 0.7-1472-v5.tgz, 0.7-1472-v6.tgz, 0001-CASSANDRA-1472-rebased-to-0.7-branch.txt,
0019-Rename-bugfixes-and-fileclose.txt, 1472-v3.tgz, 1472-v4.tgz, 1472-v5.tgz, anatomy.png,
v4-bench-c32.txt
>
>
> Bitmap indexes are a very efficient structure for dealing with immutable data. We can
take advantage of the fact that SSTables are immutable by attaching them directly to SSTables
as a new component (supported by CASSANDRA-1471).

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