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HBase >> mail # dev >> HBase - Secondary Index


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Re: HBase - Secondary Index
Thanks Anoop for the reply.  I was planning to reply if not from you.

Regards
Raml

On Wed, Dec 5, 2012 at 4:34 PM, Anoop Sam John <[EMAIL PROTECTED]> wrote:

> Hi Jan
>          Yes we guarentee the consistency between user table and index
> table. The put operation will be handled as a transactional way so as to
> make sure the data is added to both tables or reverted back from both. Some
> new CP hooks we have added for this obviously.
>
> -Anoop-
> ________________________________________
> From: Jan Van Besien [[EMAIL PROTECTED]]
> Sent: Wednesday, December 05, 2012 12:54 AM
> To: [EMAIL PROTECTED]
> Subject: Re: HBase - Secondary Index
>
> Hi,
>
> On 12/04/2012 09:10 AM, Anoop Sam John wrote:
>  > I would like to hear what others think on this. :)
>
> I found it interesting to read your approach on how the indexes can be
> used to speed up existing scan operations.
>
> I couldn't find anything in your presentation though about whether your
> implementation makes any guarantees to ensure the source table and the
> index table are always (eventually) in sync.
>
> What if data is inserted in the source table and then the region server
> crashes (before the coprocessor is executed)? Will the index be out of
> sync? Do you have a mechanisme in place to detect and restore this
> situation?
>
> thanks
> Jan
>