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https://issues.apache.org/jira/browse/CASSANDRA-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870031#action_12870031
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Michael Merickel commented on CASSANDRA-1087:
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The motivation would be to simplify the creation of small non-production
clusters (like everyone tries when they want to see what Cassandra is all
about). In this case the BadThings(tm) would likely be the common case, where I
just copy my schema.yaml to the new clusters because it makes sense... that's
how you setup the first node.
It feels similar to setting up bind9 in a distributed fashion where you change
a zone file and you need to update the timestamp or the file is ignored. If you
want the node to read your local changes to schema.yaml you need to provide a
number or tag greater than what it has, or it'll just be ignored. Thus you
could put the same file everywhere, with the same ID... it propagates through
the system but it's simply ignored by nodes that already have read the schema
defined by that ID. Easy way to solve a lot of potential conflicts in the
schema file.
Anyway when a patch comes with an ACHTUNG! flag from a core developer, I feel
the likelihood that a new user may fall into this trap is almost a guarantee.
> load schema from schema.yaml or schema.xml if no schema is present and
> definition file exists in the classpath.
> ---------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-1087
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1087
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Gary Dusbabek
> Assignee: Gary Dusbabek
> Fix For: 0.7
>
> Attachments:
> 0001-load-schema-from-schema.yaml-if-on-the-classpath.patch,
> 0002-remove-loadSchemaFromYaml-from-StorageServiceMBean.patch
>
>
> While I'm at it, this would be a good time to update
> http://wiki.apache.org/cassandra/API to include documentation about the
> system_* calls.
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