Hi JM, Thanks for link... I agree with you that i can be done when key is an integer.
Reason why i am asking for custom KeyComparator is that Something key is not just integer or some value , it can be of composition of multiple values like <COUNTRY><CITY> where key is made up of two values, one is COUNTRY and other is CITY. The way i wanted to order first them by COUNTRY , then by CITY. How can we do the same ? Hope that I have taken correct example, emphasizes my use-case. Regards Sanjiv Singh Mob : +091 9990-447-339 On Wed, Aug 27, 2014 at 5:42 PM, Jean-Marc Spaggiari < jean-m...@spaggiari.org> wrote: > Hi Sanjiv!!!! ;) > > If you want your keys to be ordered as Integers, why do you not simply > store them as Integers and not as Strings? HBase order the rows > alphabetically, and you can not change that. Yes you can implement a key > comparator if you want but I don't think it's going to change anything to > this situation. > > You might want to take a look at this: > http://hbase.apache.org/book/rowkey.design.html > > Just put your values that way: > > int myKey = 22000; > Put put = new Put(Bytes.toBytes(myKey)); > > And that will solve your ordering problem. > > JM > > > > > 2014-08-27 6:09 GMT-04:00 @Sanjiv Singh <sanjiv.is...@gmail.com>: > >> Hi All, >> >> As we know, All rows are always sorted lexicographically by their row >> key. >> In lexicographical order, each key is compared at binary level, byte by >> byte and from left to right. >> >> See the example below , where row key is some integer value and output of >> scan show lexicographical order of rows in table. >> >> hbase(main):001:0> scan 'table1' >> ROW COLUMN+CELL >> 1 column=cf1:, timestamp=1297073325971 ... >> 11 column=cf 1:, timestamp=1297073337383 ... >> 11000 column=cf1 :, timestamp=1297073340493 ... >> 2 column=cf1:, timestamp=1297073329851 ... >> 22 column=cf1:, timestamp=1297073344482 ... >> 22000 column=cf1:, timestamp=1297073333504 ... >> 23 column=cf1:, timestamp=1297073349875 ... >> >> I want to see these rows ordered as integer, not the default way. I can >> pad >> keys with '0' to get a proper sorting order(i don't like it). >> >> I wanted to see these rows sorted as integer , not just as output of scan >> OR get method , but also to store rows with consecutive integer row keys >> in >> same block. >> >> Now the question is : >> >> - Can we define our own custom KeyComparator ? >> - If Yes , can we enforce it for PUT method ? so that rows would be >> stored as new KeyComparator. >> - Can we plug this comparator duriong SCAN method to change order of >> >> result rows ? >> >> Hope, i have explained the proplem well, seeking for your valuable >> response on it. >> >> >> Regards >> Sanjiv Singh >> Mob : +091 9990-447-339 >> > >
