[HBASE-8218] Pass HTable as parameter to methods of AggregationClient

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.94.3
• Fix Version/s: 0.98.0
• Component/s: Client, Coprocessors
• Hadoop Flags: Reviewed

Release Note

In AggregationClient added a new set of APIs which takes an HTable instance rather than just table name. When client needs to call more than one aggregation API or they do have an instance of the HTable already available, they can pass it so as to avoid the overhead of creating the HTable again and again.

• Assignee: Anoop Sam John
• Reporter: Jianwei Cui
• Created: 29/Mar/13 09:57
• Updated: 20/Nov/15 11:52
• Resolved: 14/May/13 17:36

Description

In AggregationClient, methods such as max(...), min(...) pass 'tableName' as a parameter, then a HTable will be created in the method, before the method return, the created HTable will be closed.
The process above may be heavy because each call must create and close a HTable. The situation becomes worse when there is only one thread access HBase using AggregationClient. The underly HConnection of created HTable will also be created and then closed each time when we invoke these method because no other HTables using the HConnection. This operation is heavy. Therefore, can we add another group of methods which pass HTable as a parameter to methods defined in AggregationClient