Marcel Reutegger created OAK-2127:
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Summary: Long running merge may block other commits
Key: OAK-2127
URL: https://issues.apache.org/jira/browse/OAK-2127
Project: Jackrabbit Oak
Issue Type: Bug
Components: core, mongomk
Affects Versions: 1.0
Reporter: Marcel Reutegger
Assignee: Marcel Reutegger
A long running merge with DocumentNodeStore may block other commits when there
are merge conflicts and a merge is retried.
The DocumentNodeStore currently acquires a shared lock when it performs a
merge. This allows concurrent merges. A merge is retried if it fails with a
conflict and at some point will acquire above mentioned lock exclusively. This
way, merges are serialized and an attempt is made to prevent conflicts
introduced by concurrent merges.
The lock becomes problematic when a long running merge hold this lock
exclusively. All other commits are then basically blocked.
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