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https://issues.apache.org/jira/browse/CASSANDRA-1242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884664#action_12884664
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Jeremy Hanna commented on CASSANDRA-1242:
-----------------------------------------
Good call Erik - it needed some good feedback like this when people get bitten
by the change.
> When loading an AbstractType that does not include an instance field, an
> unhelpful exception is raised making diagnosis difficult
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-1242
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1242
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.7
> Reporter: Erik Onnen
> Assignee: Erik Onnen
> Fix For: 0.7
>
> Attachments: CASSANDRA-1242.patch
>
>
> 0.7.0 changes the contract for creating AbstractTypes. A custom AbstractType
> defined against 0.6.x will be incompatible and the error messaging around why
> the comparator is invalid is obtuse and non-obvious. Specifically, when
> porting a valid AbstractType from 0.6.x to 0.7 that does not include a public
> static instance field, the thrift system_add_column_family call will throw an
> exception whose only message is:
> InvalidRequestException(why:instance)
> No log messages are generated from the server as to the issue so the root
> cause is non obvious to developers.
> I marked as Major because types defined against 0.6.x did not require an
> "instance" field so at a minimum migration of AbstractTypes to 0.7 should
> document the change in what is expected of AbstractTypes.
> Patch attached for better logging and to create a more helpful exception for
> better communication to the client as to the issue.
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