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https://issues.apache.org/jira/browse/CASSANDRA-17202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17459856#comment-17459856
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Benjamin Lerer commented on CASSANDRA-17202:
--------------------------------------------
In fact it seems that it also affect earlier releases. I think we also need a
patch for 3.0 (it will merge cleanly into 3.11) and the patch for 4.0 (it will
merge cleanly in trunk).
I you can make those patches. I will run CI for them :-)
> Avoid unnecessary String.format in QueryProcessor when getting stored
> prepared statement
> -----------------------------------------------------------------------------------------
>
> Key: CASSANDRA-17202
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17202
> Project: Cassandra
> Issue Type: Bug
> Components: Messaging/Client
> Reporter: Ivan Senic
> Assignee: Ivan Senic
> Priority: Low
> Fix For: 4.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In the _QueryProcessor#getStoredPreparedStatement_ if the statement is found
> in the prepared statements cache, there is always unnecessary string creation
> using String.format in order to execute the _checkTrue_ assertion. The string
> construction is necessary only when the queries are not equal.
> {code:java}
> public static ResultMessage.Prepared getStoredPreparedStatement(String
> queryString, String clientKeyspace)
> throws InvalidRequestException
> {
> MD5Digest statementId = computeId(queryString, clientKeyspace);
> Prepared existing = preparedStatements.getIfPresent(statementId);
> if (existing == null)
> return null;
> checkTrue(queryString.equals(existing.rawCQLStatement),
> String.format("MD5 hash collision: query with the same MD5 hash
> was already prepared. \n Existing: '%s'", existing.rawCQLStatement));
> {code}
> Hopefully the JIT can optimize this once the _checkTrue_ is inlined, but it's
> getting on my nerves as it's popping up on my flame graphs all the time.
>
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