[jira] [Updated] (CASSANDRA-7930) Warn when evicting prepared statements from cache

["Robbie Strickland (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robbie Strickland updated CASSANDRA-7930:
-----------------------------------------
    Attachment: cassandra-2.1.txt

The attached patch adds a metric for evicted statements and logs a warning when eviction occurs.

> Warn when evicting prepared statements from cache
> -------------------------------------------------
>
>                 Key: CASSANDRA-7930
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Robbie Strickland
>            Assignee: Robbie Strickland
>         Attachments: cassandra-2.1.txt
>
>
> The prepared statement cache is an LRU, with a max size of maxMemory / 256.  There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening.
> At the very least, we should provide a JMX metric and possibly a log message indicating this is happening.  At some point it may also be worthwhile to make this tunable for users with large numbers of statements.



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