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From "Carl Yeksigian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12443) Remove alter type support
Date Tue, 27 Sep 2016 15:33:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15526479#comment-15526479
] 

Carl Yeksigian commented on CASSANDRA-12443:
--------------------------------------------

I've pushed a branch for 3.0 (not sure where this should go, but it is a simple enough patch
to roll it forward to trunk). This disallows the changing of types; I've changed the things
that will help CASSANDRA-10309. Only worry with this solution is that someone could execute
an alter statement on a lower-version cluster machine and change the schema in the table and
on some cluster machines. However, since we say not to touch the schema while operating in
a mixed-version cluster, this shouldn't happen.

[branch|https://github.com/carlyeks/cassandra/tree/ticket/12443/3.0]
[utest|http://cassci.datastax.com/job/carlyeks-ticket-12443-3.0-testall/]
[dtest|http://cassci.datastax.com/job/carlyeks-ticket-12443-3.0-dtest/]


> Remove alter type support
> -------------------------
>
>                 Key: CASSANDRA-12443
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12443
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Carl Yeksigian
>            Assignee: Carl Yeksigian
>             Fix For: 4.x
>
>
> Currently, we allow altering of types. However, because we no longer store the length
for all types anymore, switching from a fixed-width to variable-width type causes issues.
commitlog playback breaking startup, queries currently in flight getting back bad results,
and special casing required to handle the changes. In addition, this would solve CASSANDRA-10309,
as there is no possibility of the types changing while an SSTableReader is open.
> For fixed-length, compatible types, the alter also doesn't add much over a cast, so users
could use that in order to retrieve the altered type.



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