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From "Todd Blose (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-990) Replace cassandra.xml with cassandra.yaml
Date Fri, 16 Apr 2010 05:51:24 GMT
Replace cassandra.xml with cassandra.yaml
-----------------------------------------

                 Key: CASSANDRA-990
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-990
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
    Affects Versions: 0.7
            Reporter: Todd Blose
            Assignee: Todd Blose
         Attachments: CASSANDRA-990.patch

This is an entire rewrite of the XML storage configuration to YAML, inspired by the discussion
in CASSANDRA-671.

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 KSMetaData and CFMetaData instances, respectively.

This was implemented using SnakeYaml (http://code.google.com/p/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There are numerous benefits to this new approach: 1) a complete shifting away from an outdated,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

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.

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