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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1966) Option to control how many items are read on cache load
Date Thu, 16 Jun 2011 18:46:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050640#comment-13050640
] 

Jonathan Ellis commented on CASSANDRA-1966:
-------------------------------------------

Sounds good.

Comments:

- row_cache_keys_to_save should be an int, not double
- if we use Integer.MAX_VALUE for default we don't need to special case -1
- the purpose of DefaultInteger is to preserve temporary changes made via jmx, when the schema
is modified (see DefaultX.isModified and CFS.reload)

> Option to control how many items are read on cache load
> -------------------------------------------------------
>
>                 Key: CASSANDRA-1966
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1966
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Chris Burroughs
>            Assignee: Chris Burroughs
>            Priority: Minor
>         Attachments: 1966-v1.txt
>
>
> CASSANDRA-1417 added an option to save the key and/or row cache keys which is cool. 
However, for a row large cache it can take a long time to read all of the rows.  For example
I have a 400,000 item row cache, and loading that on restart takes a little under an hour.
> In addition to configuring the size of the row cache, and how often it should be saved
to disk, I propose an option to control how many items are loaded on startup (or alternately
only saving n items out of the full row cache to begin with).

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