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Posted to user@cassandra.apache.org by Jon Graham <sj...@gmail.com> on 2010/03/12 21:59:19 UTC

Cassandra 0.5.1 get_key_range problem

Hello,

When using the get_key_range method with ConsistencyLevel.ONE an entire
block of keys is not returned.
I loop over the get_key_range method, advancing the start key after each
call (requesting 8K keys per call).

When running the program several times, I got the same results with large
key blocks not returned.

Then, I change the program to use ConsistencyLevel.ALL, then all the keys
are returned as expected.

Change the program back to use ConsistencyLevel.ONE and all the keys are now
returned.

Has anyone else seen this issue?

I would have expected ConsistencyLevel.ONE to be able to return all the
keys. My 6 node cluster uses
a replication factor of 3.

Thanks for your help,
Jon

Re: Cassandra 0.5.1 get_key_range problem

Posted by Jon Graham <sj...@gmail.com>.

Thanks once again Jonathan,

I don't mind switching to an updated API call.

Was there any known issue like I described with the get_key_range method?

Could the use of certain start/end keys, return counts or consistency levels
contibute to the issue I'm seeing?

Best Regards,
Jon
On Fri, Mar 12, 2010 at 1:53 PM, Jonathan Ellis <jb...@gmail.com> wrote:

> get_key_range is deprecated.  You should use get_range_slice.
>
> On Fri, Mar 12, 2010 at 3:59 PM, Jon Graham <sj...@gmail.com> wrote:
> > Hello,
> >
> > When using the get_key_range method with ConsistencyLevel.ONE an entire
> > block of keys is not returned.
> > I loop over the get_key_range method, advancing the start key after each
> > call (requesting 8K keys per call).
> >
> > When running the program several times, I got the same results with large
> > key blocks not returned.
> >
> > Then, I change the program to use ConsistencyLevel.ALL, then all the keys
> > are returned as expected.
> >
> > Change the program back to use ConsistencyLevel.ONE and all the keys are
> now
> > returned.
> >
> > Has anyone else seen this issue?
> >
> > I would have expected ConsistencyLevel.ONE to be able to return all the
> > keys. My 6 node cluster uses
> > a replication factor of 3.
> >
> > Thanks for your help,
> > Jon
> >
>

Re: Cassandra 0.5.1 get_key_range problem

Posted by Jonathan Ellis <jb...@gmail.com>.

get_key_range is deprecated.  You should use get_range_slice.

On Fri, Mar 12, 2010 at 3:59 PM, Jon Graham <sj...@gmail.com> wrote:
> Hello,
>
> When using the get_key_range method with ConsistencyLevel.ONE an entire
> block of keys is not returned.
> I loop over the get_key_range method, advancing the start key after each
> call (requesting 8K keys per call).
>
> When running the program several times, I got the same results with large
> key blocks not returned.
>
> Then, I change the program to use ConsistencyLevel.ALL, then all the keys
> are returned as expected.
>
> Change the program back to use ConsistencyLevel.ONE and all the keys are now
> returned.
>
> Has anyone else seen this issue?
>
> I would have expected ConsistencyLevel.ONE to be able to return all the
> keys. My 6 node cluster uses
> a replication factor of 3.
>
> Thanks for your help,
> Jon
>