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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-946) Add a configuration and implementation to populate the data into memory
Date Sat, 24 Apr 2010 03:03:49 GMT


Jonathan Ellis updated CASSANDRA-946:

    Attachment: 946-v7.txt

looks pretty good, v7 tweaks it to allow using preload even with less than 100% cached rows
by just reading the first rows in the sstables up to the cache capacity.  (obviously this
is not always useful but for cache of 90% for instance there is no reason to disallow it entirely.)

what do you think?

> Add a configuration and implementation to populate the data into memory
> -----------------------------------------------------------------------
>                 Key: CASSANDRA-946
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7
>         Environment: Linux, Cassandra
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 0.7, 0.8
>         Attachments: 946-Add_Config_v003.txt, 946-Documentation_v002.txt, 946-Load_Data_v003.txt,
946-v4.txt, 946-v5.txt, 946-v6.patch, 946-v7.txt, screenshot.png
> Proactively load data into the memory when the node is started, there will be a configuration
to enable this function and will be per Columnfamily. The requirement is to speed up the reads
for data which can reside 100% of in the memory.... In addition to enabling the RowCache to
100% we can do this so as upgrades or any other means of restart will not clear the cache
in the server.

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