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From "Olivier Michallat (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13192) PK indices in 'Prepared' response can overflow
Date Tue, 07 Feb 2017 17:59:41 GMT
Olivier Michallat created CASSANDRA-13192:
---------------------------------------------

             Summary: PK indices in 'Prepared' response can overflow
                 Key: CASSANDRA-13192
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13192
             Project: Cassandra
          Issue Type: Bug
            Reporter: Olivier Michallat
            Priority: Minor


CASSANDRA-7660 added PK indices to the {{Prepared}} response. They are encoded as shorts.

It's possible to prepare a query with more than 32768 placeholders (the hard limit is 64K).
For example, we sometimes see users running IN queries with thousands of elements (a bad practice
of course, but still possible).

When a PK component is present after the 32768th position, the PK index overflows and a negative
value is returned. This can throw off clients if they're not prepared to handle it. For example,
the Java driver currently accepts the response, but will fail much later if you try to compute
a bound statement's routing key.

Failing fast would be safer here, the prepare query should error out if we detect a PK index
overflow.



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