[ACCUMULO-1228] Allow clients to disable column families and locality groups

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 1.5.0
• Component/s: client, tserver
• Assignee: Unassigned
• Reporter: William Slacum
• Created: 29/Mar/13 18:09
• Updated: 07/Apr/15 02:24
• Resolved: 07/Apr/15 02:24

Description

There's an inconsistency between what a server is capable of and what a client can tell it to do with respect to fetching column families.

Currently, a user can tell a Scanner to fetch some set of column families. The iterators support not only this, but also the converse where a user does not want to retrieve column families. An iterator implementation can do this by hand, but a client cannot specifically tell a Scanner to not return data from a set of column families. Clients should be able to specify this option.

There also seems to be an inconsistency with how locality groups are defined and then utilized. If I want to specify a set of column families as being part of a locality group, I have to provide a mapping of locality group name to a list of column families. If I want to fetch a locality group, I have to get the mapping first, rather than just set which locality group I want to use. It'd be more convenient to tell the scanner just to fetch which locality groups I want, and have the server know which column families that means.

Issue Links

• relates to: ACCUMULO-415 support iterator profiles