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From Mohammad Tariq <donta...@gmail.com>
Subject Re: Reg:delete performance on HBase table
Date Wed, 05 Dec 2012 16:34:09 GMT
Hello Manoj,

     When a Delete command is issued , no data is actually deleted
instantaneously. Instead a tombstone marker is set, making the deleted
cells effectively invisible.

The tombstone markers are only deleted during major compactions (which
compacts all store files to a single one), because in order to prove that a
tombstone marker has no effect HBase needs to look at all cells.

HBase periodically removes deleted cells during compactions.


    Mohammad Tariq

On Wed, Dec 5, 2012 at 6:33 PM, Manoj Babu <manoj444@gmail.com> wrote:

> Hi All,
> I am having doubt on delete performance inHBase table.
> I have 190 million rows in oracle table it hardly took 4hours to delete it,
> If i am having the same 190 million rows in HBase table how much time by
> approx Hbase will take to delete the rows(based on row key range) and
> how internally HBase handles delete?
> Thanks in advance!
> Cheers!
> Manoj.

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