[HBASE-9717] Allow filterRowKey to return a next key hint

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Component/s: Filters
• Assignee: Unassigned
• Reporter: Mathias Herberts
• Created: 05/Oct/13 21:35
• Updated: 16/Jun/22 18:15
• Resolved: 10/Oct/13 21:53

Description

The Filter interface has a filterRowKey method which returns a boolean set to true if the given row key should be filtered out.

When a row key is filtered, it could be interesting to be able to provide the scanner a hint about the next row key which should be examined. This could tremendously speed up scanning in some cases.

The logic could be similar to that of filterKeyValue with a helper method getNextRowKeyHint, or even simpler, filterRowKey could return a byte[] which would be set to null to mean keep the row, to the empty array to mean filter the row and there is not hint, and to a non empty byte array to mean filter the row and here is a hint about the next key that should be scanned.