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https://issues.apache.org/jira/browse/OAK-4862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604435#comment-15604435
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Michael Dürig commented on OAK-4862:
------------------------------------

We need to be careful here: {{MemoryNodeStore}} has never been properly tested 
beyond what it is being used by other parts in Oak. In Oak itself we switched 
many tests from {{MemoryNodeStore}} to {{SegmentNodeStore}} as the former 
created problems for us. Specifically regarding its consistency model it might 
considerably differ from the other implementations. E.g. The way {{merge()}} 
rebases changes behaves AFAIR differently under load. 

> Provide a MemoryNodeStoreService
> --------------------------------
>
>                 Key: OAK-4862
>                 URL: https://issues.apache.org/jira/browse/OAK-4862
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.5.10
>            Reporter: Oliver Lietz
>            Assignee: Chetan Mehrotra
>            Priority: Minor
>             Fix For: 1.5.13
>
>
> There should be a component for {{MemoryNodeStore}} similar to 
> {{SegmentNodeStoreService}} and {{DocumentNodeStoreService}} which can be 
> used e.g. (but not only) in ITs to reduce disk I/O.



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