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https://issues.apache.org/jira/browse/CASSANDRA-1563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919280#action_12919280
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Gary Dusbabek edited comment on CASSANDRA-1563 at 10/8/10 9:47 AM:
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isset isn't going to help. I ran into this when implementing the feature.
isset returns true for any unset field that has a default value. The only way
to do this properly is to first obtain the CfDef from the server, modify it,
then send it back (especially for those fields that don't have a default and
null is interpreted as valid).
EDIT: A ugly approach that I turned down first would be to send a map of values
to the server and only values in the map are updated.
was (Author: gdusbabek):
isset isn't going to help. I ran into this when implementing the feature.
isset returns true for any unset field that has a default value. The only way
to do this properly is to first obtain the CfDef from the server, modify it,
then send it back (especially for those fields that don't have a default and
null is interpreted as valid).
> system_update_column_family() sets absent values to 0
> -----------------------------------------------------
>
> Key: CASSANDRA-1563
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1563
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.7 beta 1
> Reporter: Tyler L. Hobbs
> Assignee: Jon Hermes
> Fix For: 0.7.0
>
> Attachments: reproduce.txt
>
>
> When system_update_keyspace() is supplied with a CfDef that does not have,
> for example, min_compaction_threshold or gc_grace_seconds, it sets them to
> zero. I would expect them to be unchanged, instead.
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