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