[HBASE-5512] Add support for INCLUDE_AND_SEEK_USING_HINT

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Hadoop Flags: Reviewed
• Assignee: Unassigned
• Reporter: Ted Yu
• Created: 02/Mar/12 19:20
• Updated: 13/Jun/22 15:35
• Resolved: 09/Mar/12 07:10

Description

This came up from HBASE-2038
From Anoop:

• What we wanted from the filter is include a row and then seek to the next row which we are interested in. I cant see such a facility with our Filter right now. Correct me if I am wrong. So suppose we already seeked to one row and this need to be included in the result, then the Filter should return INCLUDE. Then when the next next() call happens, then only we can return a SEEK_USING_HINT. So one extra row reading is needed. This might create even one unwanted HFileBlock fetch (who knows).
  Can we add reseek() at higher level?

From Lars:
Yep, for that we'd need to add INCLUDE_AND_SEEK_USING_HINT (similar to the INCLUDE_AND_SEEK_NEXT_ROW that we already have). Shouldn't be hard to add, I'm happy to do that, if that's the route we want to go with this.