Alex Parvulescu created OAK-4949:

             Summary: SegmentWriter buffers child node list changes
                 Key: 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.


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