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From "Aleksey Yeschenko (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7719) Add PreparedStatements related metrics
Date Sat, 13 Sep 2014 05:58:34 GMT


Aleksey Yeschenko commented on CASSANDRA-7719:

Got a few nits/questions:

1. Why do we bother with incrementing activePreparedStatements counter, when we could instead
make it a Gauge and return the sum of preparedStatements.size() and thriftPreparedStatements.size()
(w/ some method in QP exposing the overall sum)
2. Logging "Stored prepared statement (hash) with  bind markers", even at trace, seems absolutely
useless in practice to me
3. In general, we seem to prefer Math.max(1, foo) to a ternary foo == 0 ? 1 : foo style elsewhere
in the codebase
4. activePreparedStatements/"ActivePreparedStatements" vs. executed(Un)Prepared/"Executed(Un)Prepared"
naming is inconsistent, and should be standardized (I vote change the latter to executedPreparedStatements/"ExecutedPreparedStatements"
style) - the metric names are public and must be consistent, while inconsistent variable names
are merely a nit
5. Should 'unprepared' be 'non-prepared'?

> Add PreparedStatements related metrics
> --------------------------------------
>                 Key: CASSANDRA-7719
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Michaël Figuière
>            Assignee: T Jake Luciani
>            Priority: Minor
>             Fix For: 2.1.1
>         Attachments: 7719.txt
> Cassandra newcomers often don't understand that they're expected to use PreparedStatements
for almost all of their repetitive queries executed in production.
> It doesn't look like Cassandra currently expose any PreparedStatements related metrics.It
would be interesting, and I believe fairly simple, to add several of them to make it possible,
in development / management / monitoring tools, to show warnings or alerts related to this
bad practice.
> Thus I would suggest to add the following metrics:
> * Executed prepared statements count
> * Executed unprepared statements count
> * Amount of PreparedStatements that have been registered on the node

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