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Posted to commits@cassandra.apache.org by "Sylvain Lebresne (JIRA)" <ji...@apache.org> on 2014/11/24 11:01:15 UTC

[jira] [Comment Edited] (CASSANDRA-8231) Wrong size of cached prepared statements

    [ https://issues.apache.org/jira/browse/CASSANDRA-8231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222841#comment-14222841 ] 

Sylvain Lebresne edited comment on CASSANDRA-8231 at 11/24/14 10:00 AM:
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Well, you might want to check again because it's been committed. Make sure you're using http://git-wip-us.apache.org/repos/asf/cassandra.git, not some mirror that lags behind.


was (Author: slebresne):
Well, you might want to check again because it's beein committed. Make sure you're using http://git-wip-us.apache.org/repos/asf/cassandra.git, not some mirror that lags behind.

> 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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