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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-1666) FileDataStore inUse map causes contention in concurrent env
Date Wed, 02 Apr 2014 11:18:14 GMT
Chetan Mehrotra created OAK-1666:

             Summary: FileDataStore inUse map causes contention in concurrent env
                 Key: OAK-1666
                 URL: https://issues.apache.org/jira/browse/OAK-1666
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: core
            Reporter: Chetan Mehrotra
            Assignee: Chetan Mehrotra
            Priority: Minor
             Fix For: 0.20

JR2 FileDataStore#inUseMap [1] is currently a synchronized map and that at times causes contention
concurrent env. This map is used for supporting the Blob GC logic for JR2. 

With Oak this map content is not used. As a fix we can either

# Set inUseMap to a Guava Cache Map which has weak keys and value
# Set inUseMap to a no op map where all put calls are ignored
# Modify FDS to disable use of inUseMap or make {{usesIdentifier}} protected

#3 would be a proper fix and #2 can be used as temp workaround untill FDS gets fixed

[1] https://github.com/apache/jackrabbit/blob/trunk/jackrabbit-data/src/main/java/org/apache/jackrabbit/core/data/FileDataStore.java#L118

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