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https://issues.apache.org/jira/browse/CASSANDRA-8231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222982#comment-14222982
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Benjamin Lerer commented on CASSANDRA-8231:
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Could you try the following:
1) delete the jar
2) Dowload the jar from:
http://search.maven.org/remotecontent?filepath=com/github/jbellis/jamm/0.3.0/jamm-0.3.0.jar
and put it in the lib folder
3) tell me if you still have the error
> Wrong size of cached prepared statements
> ----------------------------------------
>
> Key: CASSANDRA-8231
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8231
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jaroslav Kamenik
> Assignee: Benjamin Lerer
> Fix For: 2.1.3
>
> Attachments: 8231-notes.txt, CASSANDRA-8231-V2-trunk.txt,
> CASSANDRA-8231-V2.txt, CASSANDRA-8231.txt, Unsafes.java
>
>
> Cassandra counts memory footprint of prepared statements for caching
> purposes. It seems, that there is problem with some statements, ie
> SelectStatement. Even simple selects is counted as 100KB object, updates,
> deletes etc have few hundreds or thousands bytes. Result is that cache -
> QueryProcessor.preparedStatements - holds just fraction of statements..
> I dig a little into the code, and it seems that problem is in jamm in class
> MemoryMeter. It seems that if instance contains reference to class, it counts
> size of whole class too. SelectStatement references EnumSet through
> ResultSet.Metadata and EnumSet holds reference to Enum class...
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