Michael Dürig created OAK-3330:
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Summary: FileStore lock contention with concurrent writers
Key: OAK-3330
URL: https://issues.apache.org/jira/browse/OAK-3330
Project: Jackrabbit Oak
Issue Type: Improvement
Components: segmentmk
Reporter: Michael Dürig
Assignee: Michael Dürig
Concurrently writing to the file store can lead to a sever lock contention in
{{FileStore#readSegment}}. That method searches the current {{TarWriter}}
instance for the segment once it could not be found in any of the {{TarReader}}
instances. This is the point where synchronizes on the {{FileStore}} instance,
which leads to the contention.
The effect is only observable once the segment cache becomes full and reads
actually need to go to the file store. Thus a possible improvement could be to
pin segments from the current tar writer to the cache. Alternatively we could
try to ease locking by employing read/write locks where possible.
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