Vikas Saurabh created OAK-8512:
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Summary: Without prefetch CopyOnRead opens index file remoted
Key: OAK-8512
URL: https://issues.apache.org/jira/browse/OAK-8512
Project: Jackrabbit Oak
Issue Type: Bug
Reporter: Vikas Saurabh
Without prefetch enabled, CopyOnReadDirectory schedules a copy of file when
{{Directory#openInput}} is invoked. This happens even if there might a copy of
file completely available already (maybe due to CopyOnWriteDirectory). While
the scheduled copy would check if the file is valid already but by that time
often index file are accessed remotely.
The fix is fairly simple - don't schedule if file exists locally and passes our
weak test that length matches what we expect.
But, since we strongly advise to enable prefetch, the priority of the issue is
minor. Perf impact would be significant during application start so sev should
high I guess.
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