Jukka Zitting created OAK-786:
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Summary: Fall back to pessimism
Key: OAK-786
URL: https://issues.apache.org/jira/browse/OAK-786
Project: Jackrabbit Oak
Issue Type: Sub-task
Components: core
Reporter: Jukka Zitting
Priority: Minor
By default the SegmentMK uses optimistic locking when committing changes to a
given journal. This works well most of the time, but there a few scenarios when
this strategy will fail. For example:
# A large batch operation while other smaller changes are being committed.
# Lots of concurrent changes being committed against the same journal.
In such cases optimistic locking will lead to some changes being delayed
indefinitely, whereas pessimistic locking can guarantee eventual completion of
all operations at the cost of potentially significantly reduced throughput. See
http://markmail.org/message/dl3semmp577bnqoi for related discussion.
As a hybrid solution that attempts to combine the best aspects of both
optimistic and pessimistic locking, we should make the SegmentMK fall back to
pessimism if optimistic locking fails after some N attempts or X seconds.
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