[jira] [Created] (CASSANDRA-5672) Add enumumerated column to system_trace.events table to signify the type of event.

["Ryan McGuire (JIRA)" <ji...@apache.org>]

Ryan McGuire created CASSANDRA-5672:
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             Summary: Add enumumerated column to system_trace.events table to signify the type of event.
                 Key: CASSANDRA-5672
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5672
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Ryan McGuire
            Priority: Minor


Tracing of queries is useful for at least two different purposes:

* Interactively diagnosing a problem, via cqlsh, by a human.
* Programatically recording and responding to how queries behave.

This second purpose is not well suited to how the system_trace.events table is currently organized, as the only identifying characteristic of each event is a free-form string that can (and has) been changed in later versions.

[~jbellis] [mentioned the possibility](http://www.datastax.com/dev/blog/advanced-request-tracing-in-cassandra-1-2) of adding an enumeration of event types that would be immutable.

Reference [this dtest](https://github.com/riptano/cassandra-dtest/pull/13/files) that parses the strings in this table via regex. If these strings change, this test will break.

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