Vikas Saurabh created OAK-3494:
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Summary: MemoryDiffCache should also check parent paths before
falling to Loader (or returning null)
Key: OAK-3494
URL: https://issues.apache.org/jira/browse/OAK-3494
Project: Jackrabbit Oak
Issue Type: Bug
Components: core
Reporter: Vikas Saurabh
Each entry in {{MemoryDiffCache}} is keyed with {{(path, fromRev, toRev)}} for
the list of modified children at {{path}}. A diff calcualted by
{{DocumentNodeStore.diffImpl}} at '/' (passively via loader) or
{{JournalEntry.applyTo}} (actively) fill each path for which there are modified
children (including the hierarchy)
But, if an observer calls {{compareWithBaseState}} on a unmodified sub-tree,
the observer will still go down to {{diffImpl}} although cached parent entry
can be used to answer the query.
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