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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-1356) Expose the preferred transient space size as repository descriptor
Date Wed, 04 Feb 2015 09:56:35 GMT

    [ https://issues.apache.org/jira/browse/OAK-1356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14304860#comment-14304860

Chetan Mehrotra commented on OAK-1356:

[~mreutegg] Given the recent work of yours around supporting large transactions what should
we do about this issue. Is this change required?

> Expose the preferred transient space size as repository descriptor 
> -------------------------------------------------------------------
>                 Key: OAK-1356
>                 URL: https://issues.apache.org/jira/browse/OAK-1356
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, jcr
>            Reporter: Tobias Bocanegra
>            Assignee: Chetan Mehrotra
>              Labels: api
>             Fix For: 1.2
> The problem is that the different stores have different transient space characteristics.
for example the MongoMK is very slow when handling large saves.
> suggest to expose a repository descriptor that can be used to estimate the preferred
transient space, for example when importing content.
> so either a boolean like: 
>   {{option.infinite.transientspace}}
> or a number like:
>   {{option.transientspace.preferred.size}}
> the later would denote the average number of modified node states that should be put
in the transient space before the persistence starts to degrade.

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