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From: Oliver Plohmann <oliver@objectscape.org>
Subject: Re: Loading data on-demand in Cassandra
Date: Mon, 13 Aug 2012 07:12:40 +0200
To: "user@cassandra.apache.org" <user@cassandra.apache.org>


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Thanks Dave. Does anybody know of a distributed in-memory system that can do=
 this and that supports structured data (e.g. tables)?=20

/Oliver

Am 12.08.2012 um 21:39 schrieb Dave Brosius <dbrosius@mebigfatguy.com>:

> When data is first written it does remain in memory until that memory is f=
lushed. After the data is only on disk, it remains there until a read for th=
at row-key/column is requested so in essense it's     always load on demand.=

>=20
> Currently there is no support for async notifications of changes.
>=20
>=20
>=20
> On 08/12/2012 03:24 PM, Oliver Plohmann wrote:
>>=20
>> Hello,
>>=20
>> I'm looking a bit into Cassandra to see whether it would be something to g=
o with for my company. I searched through the Internet, looked through the FA=
Qs, etc. but there are still some few open questions. Hope I don't bother an=
ybody with the usual beginner questions ...
>>=20
>> Is there a way to do load-on-demand of data in Cassandra? For the time be=
ing, we cannot afford to built up a cluster that holds our 700 GB SQL-Databa=
se in RAM. So we need to be able to load data on-demand from our relational d=
atabase. Can this be done in Cassandra? Then there also needs to be a way to=
 unload data in order to reclaim RAM space. Would be nice if it were possibl=
e to register for an asynchronous notification in case some value was change=
d. Can this be done?
>>=20
>> Thanks for any answers.
>> Regards, Oliver
>>=20
>=20

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<html><head></head><body bgcolor="#FFFFFF"><div>Thanks Dave. Does anybody know of a distributed in-memory system that can do this and that supports structured data (e.g. tables)?&nbsp;<br><br><div>/Oliver</div></div><div><br>Am 12.08.2012 um 21:39 schrieb Dave Brosius &lt;<a href="mailto:dbrosius@mebigfatguy.com">dbrosius@mebigfatguy.com</a>&gt;:<br><br></div><div></div><blockquote type="cite"><div>
  
    <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type">
  
  
    When data is first written it does remain in memory until that
    memory is flushed. After the data is only on disk, it remains there
    until a read for that row-key/column is requested so in essense it's
    always load on demand.<br>
    <br>
    Currently there is no support for async notifications of changes.<br>
    <br>
    <br>
    <br>
    On 08/12/2012 03:24 PM, Oliver Plohmann wrote:
    <blockquote cite="mid:502802FB.60301@objectscape.org" type="cite">
      <meta http-equiv="content-type" content="text/html;
        charset=ISO-8859-1">
      <p class="MsoNormal">Hello,<o:p></o:p></p>
      <p class="MsoNormal"><o:p></o:p>I'm looking a bit into Cassandra
        to see whether it would be something to go with for my company.
        I searched through the Internet, looked through the FAQs, etc.
        but there are still some few open questions. Hope I don't bother
        anybody with the usual beginner questions ...<o:p></o:p></p>
      <p class="MsoNormal"><o:p></o:p>Is there a way to do
        load-on-demand of data in Cassandra? For the time being, we
        cannot afford to built up a cluster that holds our 700 GB
        SQL-Database in RAM. So we need to be able to load data
        on-demand from our relational database. Can this be done in
        Cassandra? Then there also needs to be a way to unload data in
        order to reclaim RAM space. Would be nice if it were possible to
        register for an asynchronous notification in case some value was
        changed. Can this be done?<o:p></o:p></p>
      <p class="MsoNormal"><o:p></o:p>Thanks for any answers.<o:p></o:p><br>
        Regards, Oliver</p>
    </blockquote>
    <br>
  

</div></blockquote></body></html>
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