Hi Jiajun, Sure, why not? What are you trying to achieve?
Lars On Mon, Dec 6, 2010 at 3:19 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 >> > >> >
