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Posted to user@cassandra.apache.org by Donna Li <do...@utstar.com> on 2011/06/10 10:09:42 UTC
toke range
Hello all:
Cassandra use MD5 hash and we can get the token range such as:
Address Status Load Range
Ring
142717619497548302610133488236729667990
10.63.59.71 Up 140.93 KB
38183556207930269037140083379529366016 |<--|
10.63.59.72 Up 133.91 KB
93623288409632417443453979080454166465 | |
10.63.59.74 Up 178.93 KB
133908707295005027172461791030411347948 | |
10.63.59.73 Up 100.74 KB
142717619497548302610133488236729667990 |-->|
If I insert a key donna, and MD5(donna) =
32FF0880C7C75D751D0F9EF3A816EAE2(hex) = 6.6373303140336465e+37(dec),
38183556207930269037140083379529366016 < 6.6373303140336465e+37 <
93623288409632417443453979080454166465, so the key save in 10.63.59.72.
If the replication is 3, the key is also saved in 10.63.59.74 and
10.63.59.73. Am I right?
Best Regards
Donna li
Re: toke range
Posted by Jonathan Ellis <jb...@gmail.com>.
That would be correct for SimpleStrategy.
On Fri, Jun 10, 2011 at 3:09 AM, Donna Li <do...@utstar.com> wrote:
>
>
> Hello all:
>
> Cassandra use MD5 hash and we can get the token range such as:
>
> Address Status Load
> Range Ring
>
>
> 142717619497548302610133488236729667990
>
> 10.63.59.71 Up 140.93 KB
> 38183556207930269037140083379529366016 |<--|
>
> 10.63.59.72 Up 133.91 KB
> 93623288409632417443453979080454166465 | |
>
> 10.63.59.74 Up 178.93 KB
> 133908707295005027172461791030411347948 | |
>
> 10.63.59.73 Up 100.74 KB
> 142717619497548302610133488236729667990 |-->|
>
> If I insert a key donna, and MD5(donna) =
> 32FF0880C7C75D751D0F9EF3A816EAE2(hex) = 6.6373303140336465e+37(dec),
> 38183556207930269037140083379529366016 < 6.6373303140336465e+37 <
> 93623288409632417443453979080454166465, so the key save in 10.63.59.72. If
> the replication is 3, the key is also saved in 10.63.59.74 and 10.63.59.73.
> Am I right?
>
>
>
> Best Regards
>
> Donna li
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com