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From Jonathan Shook <jsh...@gmail.com>
Subject Re: Some questions about using Cassandra
Date Wed, 16 Jun 2010 00:57:23 GMT
There is JSON import and export, of you want a form of external backup.

No, you can't hook event subscribers into the storage engine. You can modify
it to do this, however. It may not be trivial.

An easier way to do this would be to have a boundary system (or dedicated
thread, for example) consume data in small amounts, using some temporal
criterion, with a checkpoint. If the results of consuming the data are
idempotent, you don't have to use a checkpoint, necessarily, but some cyclic
rework may occur.

If your storage layout includes temporal names, it should be
straightforward. The details how exactly how would depend on your storage
layout, but it is not unusual as far as requirements go.


On Tue, Jun 15, 2010 at 7:49 PM, Anthony Ikeda <
Anthony.Ikeda@cardlink.com.au> wrote:

>  We are currently looking at a distributed database option and so far
> Cassandra ticks all the boxes. However, I still have some questions.
>
>
>
> Is there any need for archiving of Cassandra and what backup options are
> available? As it is a no-data-loss system I’m guessing archiving is not
> exactly relevant.
>
>
>
> Is there any concept of Listeners such that when data is added to Cassandra
> we can fire off another process to do something with that data? E.g. create
> a copy in a secondary database for Business Intelligence reports? Send the
> data to an LDAP server?
>
>
>
>
>
> Anthony Ikeda
>
> Java Analyst/Programmer
>
> Cardlink Services Limited
>
> Level 4, 3 Rider Boulevard
>
> Rhodes NSW 2138
>
>
>
> Web: www.cardlink.com.au | Tel: + 61 2 9646 9221 | Fax: + 61 2 9646 9283
>
> [image: logo_cardlink1]
>
>
>
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