[jira] [Created] (HBASE-9717) Allow filterRowKey to return a next key hint

["Mathias Herberts (JIRA)" <ji...@apache.org>]

Mathias Herberts created HBASE-9717:
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             Summary: Allow filterRowKey to return a next key hint
                 Key: HBASE-9717
                 URL: https://issues.apache.org/jira/browse/HBASE-9717
             Project: HBase
          Issue Type: New Feature
          Components: Filters
            Reporter: Mathias Herberts


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.




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