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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-946) Add a configuration and implementation to populate the data into memory
Date Tue, 06 Apr 2010 06:09:33 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vijay updated CASSANDRA-946:
----------------------------

    Attachment: 946-Load_Data_v001.txt
                946-Add_Config_v001.txt

Attached is a quick way to load all the data into the cache without changing anything in the
existing code base.... I was thinking of having a tunable parameter which will say how many
days of data i want to load to cache... I was thinking of adding code in column family which
will tell the timestamp of the latest update to a column and if  it is later than the configured
value then load to cache.... else skip.... Comments/Suggestions?

> Add a configuration and implementation to populate the data into memory
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-946
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-946
>             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_v001.txt, 946-Load_Data_v001.txt
>
>
> 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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