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HBase >> mail # user >> Using doubles and longs as ordering row values


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Re: Using doubles and longs as ordering row values
Here's a project to deal with this issue specifically.  I'm not sure of
it's status:
https://github.com/conikeec/orderly

On Mon, Nov 5, 2012 at 4:01 PM, lars hofhansl <[EMAIL PROTECTED]> wrote:

> Have a look at the lily library. It has code to encode Longs/Doubles into
> bytes such that resulting bytes sort as expected based on the numbers.
>
> -- Lars
>
>
>
> ________________________________
>  From: Jonathan Bishop <[EMAIL PROTECTED]>
> To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
> Sent: Monday, November 5, 2012 10:41 AM
> Subject: Using doubles and longs as ordering row values
>
> Hi,
>
> In my application my row values are doubles. I would like my scans to
> traverse the rows in order of increasing values.
>
> But if I simply use
>
> double d  = ....
> byte[] row = Bytes.toBytes(d);
>
> I will get an ordering which is based on the byte values of doubles, not on
> the value of the doubles themselves.
>
> I see also that integer values have the same issue due to the first bit
> being the sign bit. So negative values will come after positive values.
>
> Any suggestions?
>
> Thanks,
>
> Jon
>
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB