Can this information be read from the METADATA table or has that changed? On Tue, Jun 16, 2015 at 9:37 AM, Christopher <[email protected]> wrote:
> Actually, scanning `new Range($endRow)` will only give you keys in > that last row (if it exists). > > You'd actually want to scan: > > [null, $endRow] :: for the first split point, $endRow > ($endRow, $endRow2] :: for each sequence of two split points, $endRow > and $endRow2 > ($endRow, null) :: for the last split point > > You can use the constructor, `Range(Text, boolean, Text, boolean)` for > the startRow and stopRow (with inclusive flag set for each, when > appropriated). > > Optionally, you could create a simple iterator based on the provided > FirstEntryInRowIterator, called "FirstEntryInTablet", which just > returns one item and then nothing else, and then simply scan the > entire table with the default options. The only thing returned would > be the first entries in each tablet. > > Of course, all this is assuming you want the first actual (existing) > key for each tablet. If you want the first key a tablet could > theoretically contain, that's even easier... no scanning necessary. > That's just a key comprised of the split point + '\0' for the row, and > empty values for everything else (except the first tablet... in the > first tablet, the first possible key has a empty byte string for the > row). > > > -- > Christopher L Tubbs II > http://gravatar.com/ctubbsii > > > On Tue, Jun 16, 2015 at 1:24 AM, Josh Elser <[email protected]> wrote: > > Not sure I understand your question. Do you mean of a Tablet instead of > > TabletServer? A TabletServer will host many Tablets. > > > > Assuming so, the easiest way to get the first key for each Tablet is to > > fetch the split points for a table. The split points are the end-row of > each > > Tablet in a table. > > > > Then, to get the first keys in each Tablet, construct a `new > > Range($endRow)`, open a Scanner and fetch the first Key. Make sure you > also > > do this with `new Range()` as well to get the first Key in the first > Tablet > > for the table (the Tablet which starts at -inf). > > > > There is no easy way that I can think of to determine what the last key > in a > > Tablet is. What is the reason that you want to explicitly know this? > Maybe > > there is a different to do what you're trying to do? > > > > - Josh > > > > > > Rukshan Chathuranga wrote: > >> > >> hi, > >> > >> Does anyone know how to get the first or last key of the tablet servers? > >> > >> Thanks and Regards. > >> > >> /Rukshan Chathuranga./ > >> /Department Of Computer Science & Engineering, > >> / > >> /Faculty Of Engineering, > >> / > >> /University Of Moratuwa. //Sri Lanka./ > >> /WEB: http://www.rukspot.com/ <http://rukspot.com/> > >> / > >> > > >
