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https://issues.apache.org/jira/browse/OAK-535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552688#comment-13552688
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Mete Atamel commented on OAK-535:
---------------------------------

Possibly and your comment highlighted another problem with the current 
MoveNodeInstruction. In "copy existing nodes" part, it tries to fetch all 
descendants of the moved node, /a/b, using FetchNodesAction but 
FetchNodesAction will fetch /a/bb as well when it shouldn't. 
                
> 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, movepatch.diff, 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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