[jira] [Commented] (CASSANDRA-8693) QueryProcessor never removes internal statements from its cache

["Tyler Hobbs (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297675#comment-14297675 ] 

Tyler Hobbs commented on CASSANDRA-8693:
----------------------------------------

It looks like the only internal queries are either in tests or are on system tables, so this shouldn't be causing a problem.  Have you seen any problems from this, or are you just being proactive about it?

> QueryProcessor never removes internal statements from its cache
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-8693
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8693
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Edward Ribeiro
>            Assignee: Edward Ribeiro
>              Labels: cql3
>             Fix For: 2.1.3
>
>         Attachments: qp-internal.patch
>
>
> QueryProcessor holds a reference to {{internalStatements}}, a map for prepared statements used internally.
> Those commands don't mix with the ones created by the user, but the problem is that if a KS/CF is dropped and then recreated {{internalStatements}} entries will point to invalid PreparedStatements (old cf_id) so any operation on those statements will fail thereafter. In fact, as of today, this map is never actually cleaned, no matter what.
> This problem is similar to the ones addressed by https://issues.apache.org/jira/browse/CASSANDRA-8652 and https://issues.apache.org/jira/browse/CASSANDRA-7566, so those issues provide any further context. 
> I am attaching a patch to this issue. 



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