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From "Todd Blose (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-990) Replace cassandra.xml with cassandra.yaml
Date Fri, 16 Apr 2010 08:23:26 GMT


Todd Blose updated CASSANDRA-990:

    Attachment: cassandra_yaml_w_comments.txt

> Replace cassandra.xml with cassandra.yaml
> -----------------------------------------
>                 Key: CASSANDRA-990
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7
>            Reporter: Todd Blose
>            Assignee: Todd Blose
>         Attachments: CASSANDRA-990.patch, cassandra.yaml, cassandra_yaml_w_comments.txt,
snakeyaml-1.6.jar, test_conf_cassandra.yaml.txt
> This is an entire rewrite of the XML storage configuration to YAML, inspired by the discussion
> DatabaseDescriptor now parses conf/cassandra.yaml. It behaves the same way as before,
but instead of dealing with an XML parse tree, a yaml parser is now created that associates
a custom Java class with the entire config (Config). In addition, keyspace and column family
YAML entries are deserialized to Keyspace and ColumnFamily instances, respectively.
> This was implemented using SnakeYaml (
> There are numerous benefits to this new approach: 1) a complete shifting away from an
outdated, verbose data format 2) a cleaner, less bulky, human-readable config 3) significantly
less code 4) simplicity of obtaining default values 5) the config, keyspaces, and column families
may be easily loaded as custom Java classes; therefore, modifying their schema would be trivial
> Attached along with the patch are the replacement configurations for conf/cassandra.xml
and test/conf/cassandra.xml, to emphasize the benefits of the transition, should the community
approve of it. I included one version with comments and one without.

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