Databases Reference
In-Depth Information
0 row(s) in 0.5570 seconds
hbase(main):003:0> put 'blogposts', 'post1', 'post:author', 'a blogger'
0 row(s) in 0.0400 seconds
hbase(main):004:0> put 'blogposts', 'post1', 'post:body', 'interesting content'
0 row(s) in 0.0240 seconds
hbase(main):005:0> put 'blogposts', 'post1', 'multimedia:header', 'header.png'
0 row(s) in 0.0250 seconds
hbase(main):006:0> put 'blogposts', 'post1', 'multimedia:body', 'body.png'
0 row(s) in 0.0310 seconds
hbase(main):012:0> put 'blogposts', 'post2', 'post:title',
hbase(main):013:0* 'yet an interesting blog post'
0 row(s) in 0.0320 seconds
hbase(main):014:0> put 'blogposts', 'post2', 'post:title',
hbase(main):015:0* 'yet another blog post'
0 row(s) in 0.0350 seconds
hbase(main):016:0> put 'blogposts', 'post2', 'post:author', 'another blogger'
0 row(s) in 0.0250 seconds
hbase(main):017:0> put 'blogposts', 'post2', 'post:author', 'another blogger'
0 row(s) in 0.0290 seconds
hbase(main):018:0> put 'blogposts', 'post2', 'post:author', 'another blogger'
0 row(s) in 0.0400 seconds
hbase(main):019:0> put 'blogposts', 'post2', 'multimedia:body-image',
hbase(main):020:0* 'body_image.png'
0 row(s) in 0.0440 seconds
hbase(main):021:0> put 'blogposts', 'post2', 'post:body', 'interesting content'
0 row(s) in 0.0300 seconds
hbase(main):022:0> put 'blogposts', 'post2', 'multimedia:body-video',
hbase(main):023:0* 'body_video.mpeg'
0 row(s) in 0.0380 seconds
The two sample data points are given ids of
post1
and
post2
, respectively. If you notice, I made
a mistake while entering the title for
post2
so I reentered it. I also reentered the same author
information three
items
for
post2
. In the relational world, this would imply a data update. In
HBase, though, records are immutable. Reentering data leads to creation of a newer version of the
data set. This has two benefi ts: the atomicity confl icts for data update are avoided and an implicit
built-in versioning system is available in the data store.
Now that the data is stored, you are ready to write a couple of elementary queries to retrieve it.
