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From Amandeep Khurana <ama...@gmail.com>
Subject Re: Question about HBase for OLTP
Date Mon, 09 Jan 2012 17:36:23 GMT
Delete and Updates in HBase are like new writes.. The way to update a cell
is to actually do a Put. And when you delete, it internally flags the cell
to be deleted and removes the data from the underlying file on the next
compaction. If you want to learn the technical details further, you could
look at the source and also refer to the BigTable paper for the design


On Tue, Jan 10, 2012 at 1:25 AM, fullysane <fullysane@msn.com> wrote:

> Hi
> I know HBase is designed for OLAP, query intensive type of applications.
> But
> I like the flexibility feature of its column-base architecture which allows
> me having no need to predefine every column of a table and I can
> dynamically
> add new column with value in my OLTP application code and capture its meta
> data information.
> My question is basically about if we can use HBase for OLTP application
> database. I know Hbase works well with Inserting column data of a row key
> and set new version for the new piece of the data, and not so well for
> updating and deleting existing piece of data. However, if I turn OLTP
> update
> and delete operations into all insertion of new version of colum data as I
> described below:
> For OLTP data update, if I set my table column family’s versioning to 1 and
> always do insert (put) when there is need to update an existing data row
> columns, and let Hbase to handle the delete of the old versions through DB
> garbage collection.
> For OLTP data delete, I can use inserting new version on a flag field to
> “deleted”, which is a logical delete, and have some batch job to clean up
> all logically deleted rows later.
> Will the above scenario work for using HBase for an OLTP application? Any
> flaws on doing it?
> Can some one share the experiences of using HBase for OLTP applications?
> Thanks,
> --
> View this message in context:
> http://old.nabble.com/Question-about-HBase-for-OLTP-tp33107782p33107782.html
> Sent from the HBase User mailing list archive at Nabble.com.

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