Marcel Reutegger created OAK-8489:
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Summary: 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
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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