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https://issues.apache.org/jira/browse/CASSANDRA-13533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16013227#comment-16013227
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Jeff Jirsa commented on CASSANDRA-13533:
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{quote}
This looks like stuff is being wrongly reused when no flush is happening
{quote}
Obviously that flag is only for unit tests, but can you describe the symptom
that led you to finding/fixing this?
> ColumnIdentifier object size wrong when tables are not flushed
> --------------------------------------------------------------
>
> Key: CASSANDRA-13533
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13533
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Eduard Tudenhoefner
> Assignee: Eduard Tudenhoefner
> Fix For: 3.0.14, 3.11.0, 4.0
>
>
> It turns out that the object size of {{ColumnIdentifier}} is wrong when
> *cassandra.test.flush_local_schema_changes: false*. This looks like stuff is
> being wrongly reused when no flush is happening.
> We only noticed this because we were using the prepared stmt cache and
> noticed that prepared statements would account for *1-6mb* when
> *cassandra.test.flush_local_schema_changes: false*. With
> *cassandra.test.flush_local_schema_changes: true* (which is the default)
> those would be around *5000 bytes*.
> Attached is a test that reproduces the problem and also a fix.
> Also after talking to [~jkni] / [~blerer] we shouldn't probably take
> {{ColumnDefinition}} into account when measuring object sizes with
> {{MemoryMeter}}
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