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https://issues.apache.org/jira/browse/OAK-8066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773959#comment-16773959
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Michael Dürig commented on OAK-8066:
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Filed OAK-8069 for adding logging to better understand the situation.
> Nodes with many direct children can lead to OOME when saving
> ------------------------------------------------------------
>
> Key: OAK-8066
> URL: https://issues.apache.org/jira/browse/OAK-8066
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Priority: Major
> Labels: TarMK
>
> {{DefaultSegmentWriter}} keeps a map of [child
> nodes|https://github.com/apache/jackrabbit-oak/blob/trunk/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/DefaultSegmentWriter.java#L805]
> of a node being written. This can lead to high memory consumption in the
> case where many child nodes are added at the same time. The latter could
> happen in the case where a node needs to be rewritten because of an increase
> in the GC generation from a concurrently completed revision garbage
> collection.
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