Hey can explain your query with example ? I know they are always sorted but if they are how do you know which row key > belong to which data? Currently I use a row key of ID|Date >
> I don't clearly understand "which data", there are few things like getFamilyMap etc. which allows you to get more info about the table. In HBase the concept of "column qualifiers" is interesting, it can be created on fly for a "column-qualifier" So it is as good as tagging the data. Hence, you can get all rows belonging to particular tag/qualifier using rowscan. I'm not sure if this answers your query. -Thanks, Dani Rayan. http://www.cc.gatech.edu/~iar3/ On Fri, Jan 28, 2011 at 3:45 PM, Peter Haidinyak <[email protected]>wrote: > I know they are always sorted but if they are how do you know which row key > belong to which data? Currently I use a row key of ID|Date so I always know > what the startrow and endrow should be. I know I'm missing something really > fundamental here. :-( > > Thanks > > -Pete > > -----Original Message----- > From: tsuna [mailto:[email protected]] > Sent: Friday, January 28, 2011 12:14 PM > To: [email protected] > Subject: Re: Row Keys > > On Fri, Jan 28, 2011 at 12:09 PM, Peter Haidinyak <[email protected]> > wrote: > > This is going to seem like a dumb question but it is recommended > that you use a random key to spread the insert/read load among your region > servers. My question is if I am using a scan with startrow and endrow how > does that work with random row keys? > > The keys are always sorted. So if you generate random keys, you'll > get your data back in a random order. > What is recommended depends on the specific problem you're trying to > solve. But generally, one of the strengths of HBase is that the rows > are sorted, so sequential scanning is efficient (thanks to data > locality). > > -- > Benoit "tsuna" Sigoure > Software Engineer @ www.StumbleUpon.com >
