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https://issues.apache.org/jira/browse/OAK-8489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16890842#comment-16890842
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Marcel Reutegger commented on OAK-8489:
---------------------------------------
Proposed changes are on GitHub:
https://github.com/mreutegg/jackrabbit-oak/tree/OAK-8489
> Reduce memory usage of in-memory commit
> ---------------------------------------
>
> Key: OAK-8489
> URL: https://issues.apache.org/jira/browse/OAK-8489
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: documentmk
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Priority: Minor
>
> The memory usage of an in-memory commit currently depends on the number of
> modified nodes and the structure of modified documents. The first is limited
> by the updateLimit on the DocumentNodeStateBuilder. When the updateLimit is
> reached, the changes are pushed to a branch. The structure of the modified
> documents comes into play, when those documents have a rather high memory
> usage. The current commit implementation performs the update in a single call
> to {{DocumentStore.createOrUpdate()}}, which has a return type of
> {{List<Document>}}. The returned list contains the documents as they looked
> before the update. With a default of 100'000 as the updateLimit and heavy
> weight modified Documents, this can result in a high memory usage.
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