Thanks a lot Gary: I had missed this one cheers TuX
Gary Helmling wrote:
You can always add a PageFilter to your Scan instance to achieve this: http://hadoop.apache.org/hbase/docs/r0.20.3/api/org/apache/hadoop/hbase/filter/PageFilter.html Just be aware that you should still count on the client side if you want to strictly limit to a given size. Since the filter is applied independently on each regionserver, the client can still receive back more than the page size # of items. --gh On Tue, May 4, 2010 at 12:02 PM, TuX RaceR <tuxrace...@gmail.com> wrote:Hi Hbase users, question related to the previous one, if we want to limit the amount of data retrieved by a a scanner, can we tell to not scan after a number of rows is reached? If I look at another KV store (cassandra) the equivalent of the scan API uses there a KeyRange object, see http://wiki.apache.org/cassandra/API *Attribute* *Type* *Default* *Required* *Description* start_key string n/a N The first key in the inclusive KeyRange. end_key string n/a N The last key in the inclusive KeyRange. start_token string n/a N The first token in the exclusive KeyRange. end_token string n/a N The last token in the exclusive KeyRange. count i32 100 Y The total number of keys to permit in the KeyRange. Would it be useful (performance wise) to have a 'count' parameter too, or would it be useless as equivalent to end the scan loop application side, when the desired number of row is reached? Thanks TuX
