Daniel already said.
There's not that many mor
you should use filter and start row parameter.
I recommend RowFilter and ColumnPaginationFilter.
================================
byte[] startRow = Bytes.toBytes("999996");
byte[] endRow = null;
//
//
// filter = rowFilter;
/*
* String indexId,
* final byte[] indexStartRow,
* final byte[] indexStopRow,
byte[][] indexColumns,
final Filter indexFilter,
final byte[][] baseColumns
*/
ResultScanner scanner = table.getIndexedScanner(
cols[0], // index id
*startRow*, // start row
endRow, // end row
new byte[][] { // index columns.
Bytes.toBytes(family[0]+":"+cols[0])
},
filter, // filter
new byte[][] { //base columns.
Bytes.toBytes(family[0]+":"+cols[0]),
Bytes.toBytes(family[0]+":"+cols[1]),
Bytes.toBytes(family[0]+":"+cols[2]),
Bytes.toBytes(family[0]+":"+cols[3])
}
);
2011/1/26 Jean-Daniel Cryans <[email protected]>
> Caching is the number of rows that will be fetched per RPC, depending
> on how big your rows are you might want to set it larger or smaller.
> Try 10 then do some experiments.
>
> There's not that many more, speed of reading is always improved with
> caching. Make sure your data can fit in the block cache and that it
> stays there.
>
> J-D
>
> On Tue, Jan 25, 2011 at 2:35 AM, 陈加俊 <[email protected]> wrote:
> > final Scan scan = new Scan();
> > scan.setCaching(scannerCaching);
> > scan.addColumn(family);
> >
> > table.getScanner(scan);
> >
> > For improving the speed of scan .
> > How to adjust the parameters ? Is there any more parameters or methods
> that
> > I don't know.
> >
>
