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From: Jonathan Ellis <jbellis@gmail.com>
Date: Mon, 12 Jul 2010 07:13:44 -0500
Message-ID: <AANLkTinQbmrJTxdGR91RgX_oE6UXEZgWny55hKBVC_yl@mail.gmail.com>
Subject: Re: Iterate all keys - doing it as the faq fails for me :(
To: user@cassandra.apache.org
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This is a bug.  Can you submit a ticket with test data to reproduce?

On Fri, Jul 9, 2010 at 6:40 AM, Per Olesen <pol@trifork.com> wrote:
> Hi,
>
> I was reading http://wiki.apache.org/cassandra/FAQ#iter_world and decided=
 to implement the get_range_slices method for listing all keys of a CF. Onl=
y thing is, it doesn't work that well for me :-)
>
> I do as it says (I think), and take KeyRanges of size N and use the key o=
f the last call as start for next call. But, for small N, I keep getting th=
e exact same result back from get_range_slices call, making it impossible t=
o know when to stop.
>
> For N=3D5, the first slice of keys I get back is this:
>
> previousLastKey =3D
> keySlice.getKey() =3D xaspays
> keySlice.getKey() =3D xasfbbe
> keySlice.getKey() =3D xaspaua
> keySlice.getKey() =3D xasaapz
> keySlice.getKey() =3D xascajz
>
> I then call with previousLastKey =3D xascajz and get:
>
> previousLastKey =3D xascajz
> keySlice.getKey() =3D xascajz
> keySlice.getKey() =3D xasgacr
> keySlice.getKey() =3D xasfaem
> keySlice.getKey() =3D xasfdco
> keySlice.getKey() =3D xasfdeg
>
> I then call with previousLastKey =3D =A0xasfdeg and get:
>
> previousLastKey =3D xasfdeg
> keySlice.getKey() =3D xasfdeg
> keySlice.getKey() =3D xasfdad
> keySlice.getKey() =3D xascaiv
> keySlice.getKey() =3D xasfaqf
> keySlice.getKey() =3D xasfdeg <--- ENDS IN THE SAME KEY AS PREVIOUS SLICE=
 ?
>
> ... the above 5 keys keep getting back as the exact same result :-(
>
> If I set N higher, like 100, I get all my (2492) rows...
>
>
> /Per


--=20
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com