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From Praveen Sripati <praveensrip...@gmail.com>
Subject Disk Seeks and Column families
Date Sat, 21 Jan 2012 07:08:01 GMT
Hi,

1) According to the this url (1), HBase performs well for two or three
column families. Why is it so?

2) Dump of a HFile, looks like below. The contents of a row stay together
like a regular row-oriented database. If the column family has 100 column
family qualifiers and is dense then the data for a particular column family
qualifier is spread wide. If I want to do an aggregation on a particular
column identifier, the disk seeks doesn't seems to be much better than a
regular row-oriented database.

Please correct me if I am wrong.

K: row-550/colfam1:50/1309813948188/Put/vlen=2 V: 50
K: row-550/colfam1:50/1309812287166/Put/vlen=2 V: 50
K: row-551/colfam1:51/1309813948222/Put/vlen=2 V: 51
K: row-551/colfam1:51/1309812287200/Put/vlen=2 V: 51
K: row-552/colfam1:52/1309813948256/Put/vlen=2 V: 52

(1) - http://hbase.apache.org/book/number.of.cfs.html

Thanks,
Praveen

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