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Date: Wed, 24 Mar 2010 07:56:25 -0500
Message-ID: <2545a92c1003240556p3f9d3a91tacb1148d74eb9327@mail.gmail.com>
Subject: Re: Slice Query
From: Jeremy Dunck <jdunck@gmail.com>
To: user@cassandra.apache.org
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On Wed, Mar 24, 2010 at 4:57 AM, Colin Vipurs <zodiaczx6@gmail.com> wrote:
...
> ColumnFamily {
> =A0 'key1' {
> =A0 =A0 =A0'SuperColumn1' {
> =A0 =A0 =A0 =A0 'Column1' : <somevalue>
> =A0 =A0 =A0 =A0 'Column2' : <somevalue>
> =A0 =A0 =A0}
> =A0 =A0 =A0'SuperColumn2' {
> =A0 =A0 =A0 =A0 'Column3' : <somevalue>
> =A0 =A0 =A0}
> =A0 }
> =A0 'key2' {
> =A0 =A0 =A0'SuperColumn1' {
> =A0 =A0 =A0 =A0 'Column1' : <somevalue>
> =A0 =A0 =A0}
> =A0 =A0}
> }
>
> Could I get all keys/supercolumns where 'Column1' exists? fyi I'm
> using the Hector Java client for my work.

I think maybe you're asking because you want to perform schema migration.

If so, one option is to have client-side code that mutates to the
later schema upon encountering the old schema.
Another option is to have a schema-versioning column, and have a job
that fetches and mutates records w/ the old schema.

If there are other ways of handling schema migration, I'm curious?