Improving filter API to allow for modification of keyvalue list by filter
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Key: HBASE-2466
URL: https://issues.apache.org/jira/browse/HBASE-2466
Project: Hadoop HBase
Issue Type: Improvement
Components: filters, regionserver
Reporter: Juhani Connolly
Priority: Minor
As it stands, the Filter interface allows filtering by
Filter#filterAllRemaining() -> true indicates scan is over, false, keep going
on.
Filter#filterRowKey(byte[],int,int) -> true to drop this row, if false, we will
also call
Filter#filterKeyValue(KeyValue) -> true to drop this key/value
Filter#filterRow() -> last chance to drop entire row based on the sequence of
filterValue() calls. Eg: filter a row if it doesn't contain a specified column.
It would be useful to allow for an additional API in the form of a step to
prune the list of KeyValues to be sent by implementing an additional
Filter#filterRow(List<KeyValue>)
This would allow for a user to write a custom filter against the api that drops
unnecessary KeyValues according to user-defined rules.
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