Marcel Reutegger created OAK-1557:
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Summary: Mark documents as deleted
Key: OAK-1557
URL: https://issues.apache.org/jira/browse/OAK-1557
Project: Jackrabbit Oak
Issue Type: Improvement
Components: mongomk
Reporter: Marcel Reutegger
Fix For: 0.20
This is an improvement to make a certain use case more efficient. When there is
a parent node with frequently added and removed child nodes, the reading of the
current list of child nodes becomes inefficient because the decision whether a
node exists at a certain revision is done in the DocumentNodeStore and no
filtering is done on the MongoDB side.
So far we figured this would be solved automatically by the MVCC garbage
collection, when documents for deleted nodes are removed. However for locations
in the repository where nodes are added and deleted again frequently (think of
a temp folder), the issue pops up before the GC had a chance to clean up.
The Document should have an additional field, which is set when the node is
deleted in the most recent revision. Based on this field the DocumentNodeStore
can limit the query to MongoDB to documents that are not deleted.
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