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From Jonathan Ellis <>
Subject Re: Default behavior of generate index_name for columns...
Date Fri, 15 Jul 2011 22:29:39 GMT
Sounds reasonable to me.

On Fri, Jul 15, 2011 at 2:55 AM, Boris Yen <> wrote:
> Hi,
> I have a few column families, each has a column called user_name. I tried to
> use secondary index on user_name column for each of the column family.
> However, when creating these column families, cassandra keeps reporting
> "Duplicate index name..." exception. I finally figured out that it seems the
> default index name is "column name"+"_idx", this make my column family
> violate the "uniqueness of index name" rule.
> I was wondering if the default index_name generating rule could be like
> "column name"+"cf name", so the index name would not collide with each other
> that easily, if the user do not assign "index_name" when creating a column
> family.
> Regards
> Boris

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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