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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1572) Faster index sampling
Date Sun, 10 Oct 2010 18:41:31 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919640#action_12919640
] 

Stu Hood commented on CASSANDRA-1572:
-------------------------------------

> this raises the question of whether key cache saving should be on by default (which it
currently is)
I didn't test which portion of the gains came from 1. not allocating the byte array for the
key, 2. not decoding/decorating the key, 3. the pre-allocation. If we decorated the members
of the key-cache set as ByteBuffers rather than DecoratedKeys, we could still take advantage
of (forms of) 1 and 2.

> Faster index sampling
> ---------------------
>
>                 Key: CASSANDRA-1572
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1572
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Stu Hood
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: 0001-Split-IndexSummary.maybeAddEntry-into-shouldAddEntry.patch,
0002-Conditionally-decode-row-keys-during-SSTableReader.o.patch, 0003-Add-FBUtilities.skipShortByteArray-and-use-to-minimi.patch,
0004-Pre-allocate-indexPositions-to-minimize-resizing.patch, 0005-Better-key-estimate-for-SSTable-load.patch
>
>
> some discussion on CASSANDRA-1526

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