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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-535) MergeCommand reads complete tree into memory
Date Mon, 14 Jan 2013 10:54:13 GMT

     [ https://issues.apache.org/jira/browse/OAK-535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marcel Reutegger updated OAK-535:
---------------------------------

    Attachment: OAK-535.patch

This is a work-in-progress patch, which shows what kind of optimization I have in mind.

MergeCommand checks if there were any commits to head in the meantime. If there are none,
then the branch commits are aggregated into a single one and commit to head.

Unfortunately I see some unexpected behaviour in some cases when multiple commits are aggregated.
E.g. see additional test movesInBranch() in MongoMKBranchMergeTest.
                
> MergeCommand reads complete tree into memory
> --------------------------------------------
>
>                 Key: OAK-535
>                 URL: https://issues.apache.org/jira/browse/OAK-535
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: mongomk
>    Affects Versions: 0.5
>            Reporter: Marcel Reutegger
>         Attachments: mergefixattempt.patch, OAK-535.patch
>
>
> Merging commits to a branch back to head in MongoMK calls MergeCommand, which reads the
complete tree into memory. The more content is in the repository, the longer it takes to store
even a simple update as a property change.

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