> What is this "\x00\x00\x00\x00" thing. What does it represent ? How to > interpret it ? Is '\x' some kind of delimiter between 2 bytes ? > Does it mean size of rowkey is 5 Bytes ?
Since HBase data is untyped, the shell tries to render everything as a String. When it gets bytes that don't match characters, it encodes each byte in hexadecimal with a leading \x. So, \x00\x00\x00\x00 is the same as the full hexadecimal integer 0x00000000. > Just I am wondering.. how can I get a particular row if I want ?.. I mean in > regular rdbms we can search a row based on primary key.. how we can search a > particular row here ? For getting data, you need to type the keys in the same way. For example, you can get row 0 from the table named test by typing the following into the shell: get 'test', '\x00\x00\x00\x00' Also, if you type help in the shell, it will give you a more detailed description of usage. -Joey On Fri, Jun 10, 2011 at 4:25 AM, praveenesh kumar <[email protected]> wrote: > Hello guys..!! > > I am trying to understand hbase storing mechanism. > but I am confused about hbase rowkey.. > HBASE WIKI says its a byte array. But the way its represented I am not able > to understand that. I have set my row key as a byte array of int numbers.. > but when I am seeing it on hbase shell.. its coming in the following > format... > > ROW COLUMN+CELL > \x00\x00\x00\x00 column=details:page, timestamp=1307693977866, > value=/a.html > \x00\x00\x00\x01 column=details:page, timestamp=1307693977866, > value=/ > \x00\x00\x00\x02 column=details:page, timestamp=1307693977866, > value=/ > \x00\x00\x00\x03 column=details:page, timestamp=1307693977866, > value=/b.html > \x00\x00\x00\x04 column=details:page, timestamp=1307693977866, > value=/ > > What is this "\x00\x00\x00\x00" thing. What does it represent ? How to > interpret it ? Is '\x' some kind of delimiter between 2 bytes ? > Does it mean size of rowkey is 5 Bytes ? > Just I am wondering.. how can I get a particular row if I want ?.. I mean in > regular rdbms we can search a row based on primary key.. how we can search a > particular row here ? > > Thanks, > Praveenesh > -- Joseph Echeverria Cloudera, Inc. 443.305.9434
