[jira] [Updated] (CASSANDRA-3427) CompressionMetadata is not shared across threads, we create a new one for each read

["Sylvain Lebresne (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylvain Lebresne updated CASSANDRA-3427:
----------------------------------------

    Attachment: 3427.patch
    
> CompressionMetadata is not shared across threads, we create a new one for each read
> -----------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3427
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3427
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.0.1
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>              Labels: compression
>             Fix For: 1.0.2
>
>         Attachments: 3427.patch
>
>
> The CompressionMetada holds the compressed block offsets in memory. Without being absolutely huge, this is still of non-negligible size as soon as you have a bit of data in the DB. Reallocating this for each read is a very bad idea.

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