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https://issues.apache.org/jira/browse/OAK-2105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278588#comment-14278588
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Thomas Mueller commented on OAK-2105:
-------------------------------------
I think the OakDirectory is already changed:
org.apache.jackrabbit.oak.plugins.index.lucene.IndexDefinition.DEFAULT_BLOB_SIZE
= OakDirectory.DEFAULT_BLOB_SIZE - 300 (and DEFAULT_BLOB_SIZE is 32 * 1024).
So, still needed are tests.
> 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: 1.2, 1.1.5
>
>
> 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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