[jira] Updated: (CASSANDRA-1242) When loading an AbstractType that does not include an instance field, an unhelpful exception is raised making diagnosis difficult

["Erik Onnen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-1242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Erik Onnen updated CASSANDRA-1242:
----------------------------------

    Attachment: CASSANDRA-1242.patch

> 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
>             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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