[PHOENIX-302] Disable usage of essential column family in 0.94.6 and below

• Type: Task
• Status: Resolved
• Resolution: Fixed
• Labels: enhancement
• old issue number: 171
• Assignee: tonyhuang
• Reporter: James R. Taylor
• Created: 10/Mar/14 23:46
• Updated: 16/Mar/14 07:19
• Resolved: 16/Mar/14 07:19

Description

The essential column family feature makes queries slower in 0.94.6 and below. We should add a configuration option to disable it. It's enabled in QueryCompiler by setting the LOAD_COLUMN_FAMILIES_ON_DEMAND_ATTR to true.

Ideally, we should detect the lower HBase region server version. We could pass this back at initial cluster connection (MetaDataProtocol.getVersion() call).

Another option would be to have the config option, set it to on by default, but let users know that if they're using 0.94.6 or below, then should set it to off.