Hey Lars, Thanks for the kind explanation. got it now..
cheers, Hari On Mon, Dec 6, 2010 at 7:49 AM, 陈加俊 <[email protected]> wrote: > Hi > > Do I can use the scan filter ? the HBase that we used is version 0.20.6. > > jiajun > > On Mon, Dec 6, 2010 at 2:05 AM, Lars George <[email protected]> wrote: > > > Hi Hari, > > > > The filters are applied server side (aka predicate pushdown). If you > > were to scan and skip you incur extra IO cost. Filters, as they are > > implemented right now are simply skipping and therefore all they can > > do is slightly improve a normal scan performance. In the future you > > might get better performance as they are re-implemented as > > Coprocessors. Also, depending on certain filter criteria we can > > optimize scans by skipping entire store files (since we know it does > > not certain keys or timestamp based values). > > > > Lars > > > > On Sun, Dec 5, 2010 at 6:39 PM, Hari Sreekumar <[email protected] > > > > wrote: > > > Hi > > > > > > What are the differences between using a scan filter and simpli > > > scanning and then filtering using if conditions? Any particular > > > gotchas you need to be careful about while using filters extensively? > > > > > > Hari > > > > > >
