Alex Parvulescu created OAK-4949:
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Summary: SegmentWriter buffers child node list changes
Key: OAK-4949
URL: https://issues.apache.org/jira/browse/OAK-4949
Project: Jackrabbit Oak
Issue Type: Improvement
Components: segment-tar
Reporter: Alex Parvulescu
Assignee: Alex Parvulescu
The {{SegmentWriter}} currently buffers the list of child nodes changed on a
nodestate update [0] (new node or updated node). This can be problematic in a
scenario where there are a large number of children added to a node (ie. unique
index size seen to spike above {{10MM}} in one case).
To have a reference for the impact of this, at the {{SegmentWriter}} level, for
a list of map entries of almost {{3MM}} items, I saw it take up around
{{245MB}} heap.
This issue serves to track a possible improvement here in how we handle this
update scenario.
[0]
https://github.com/apache/jackrabbit-oak/blob/trunk/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentWriter.java#L516
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