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Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2015/04/07 22:25:13 UTC

[jira] [Updated] (OAK-2105) Review padding for blobs collection

     [ https://issues.apache.org/jira/browse/OAK-2105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marcel Reutegger updated OAK-2105:
----------------------------------
    Fix Version/s:     (was: 1.2)

> Review padding for blobs collection
> -----------------------------------
>
>                 Key: OAK-2105
>                 URL: https://issues.apache.org/jira/browse/OAK-2105
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, mongomk
>            Reporter: Marcel Reutegger
>            Assignee: Thomas Mueller
>             Fix For: 1.1.6
>
>
> MongoDB does some default padding when it stores documents. The default
> policy adds some padding and then rounds up to the next power of 2 number
> of bytes. For the blobs collection with documents that are written once
> and never modified, this default behavior may not be optimal. E.g. the
> Oak lucene directory implementation splits data into 32k chunks and stores
> them as multi-valued binary properties. This leads to documents that are
> slightly over 32k bytes in size and MongoDB will allocate 64k for it.
> Half of the space is wasted.



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