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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-5958) "Unable to find property" errors from snakeyaml are confusing
Date Mon, 02 Sep 2013 02:23:53 GMT


Jonathan Ellis commented on CASSANDRA-5958:

# Skipping missing properties looks like the inverse of the problem here, which is dealing
with properties that don't exist in the Config class
# We don't want to skip over errors, just turn the stacktrace into a friendlier message
> "Unable to find property" errors from snakeyaml are confusing
> -------------------------------------------------------------
>                 Key: CASSANDRA-5958
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: J.B. Langston
>            Priority: Minor
>         Attachments: trunk-5958-skip-missing-properties.patch
> When an unexpected property is present in cassandra.yaml (e.g. after upgrading), snakeyaml
outputs the following message:
> {code}Unable to find property 'some_property' on class: org.apache.cassandra.config.Config{code}
> The error message is kind of counterintuitive because at first glance it seems to suggest
the property is missing from the yaml file, when in fact the error is caused by the *presence*
of an unrecognized property.  I know if you read it carefully it says it can't find the property
on the class, but this has confused more than one user.
> I think we should catch this exception and wrap it in another exception that says something
like this:
> {code}Please remove 'some_property' from your cassandra.yaml. It is not recognized by
this version of Cassandra.{code}
> Also, it might make sense to make this a warning instead of a fatal error, and just ignore
the unwanted property.

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