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From Jonathan Shook <jsh...@gmail.com>
Subject Re: Some questions about using Cassandra
Date Wed, 16 Jun 2010 00:57:44 GMT
Doh! Replace "of" with "if" in the top line.

On Tue, Jun 15, 2010 at 7:57 PM, Jonathan Shook <jshook@gmail.com> wrote:

> 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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>

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