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https://issues.apache.org/jira/browse/CASSANDRA-2903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067503#comment-13067503
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Boris Yen commented on CASSANDRA-2903:
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I have tested another case, not sure if this is a bug.
I created a few column families on 0.8.0 each has user_name column, in
addition, I also enabled secondary index on this column. Then, I upgraded to
0.8.1, when I used cassandra-cli: show keyspaces, I saw index name
"user_name_idx" appears for different columns families. It seems the validation
rule for index_name on 0.8.1 has been skipped completely.
> Default behavior of generating index_name for columns might need to be
> improved.
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-2903
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2903
> Project: Cassandra
> Issue Type: Improvement
> Components: API
> Affects Versions: 0.8.1
> Reporter: Boris Yen
>
> 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.
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