[HIVE-2261] Add cleanup stages for UDFs

• Type: Wish
• Status: Resolved
• Priority: Trivial
• Resolution: Duplicate
• Affects Version/s: 0.9.0
• Component/s: Query Processor
• Assignee: Navis Ryu
• Reporter: Navis Ryu
• Created: 06/Jul/11 07:44
• Updated: 08/Mar/13 02:24
• Resolved: 08/Mar/13 02:24

Description

In some cases, we bind values at last stage of big SQL from other sources, especially from memcached. I made that kind of UDFs for internal-use.

I found 'initialize' method of GenericUDF class is good place for making connections to memcached cluster, but failed to find somewhere to close/cleanup the connections. If there is cleaup method in GenericUDF class, things can be more neat. If initializing entity like map/reduce/fetch could be also providable to life-cycles(init/close), that makes perfect.

Issue Links

• duplicates: HIVE-3628 Provide a way to use counters in Hive through UDF
• relates to: HIVE-1016 Ability to access DistributedCache from UDFs