Chetan Mehrotra created OAK-2891:
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             Summary: USe more efficient approach to manage in memory map in 
LengthCachingDataStore
                 Key: OAK-2891
                 URL: https://issues.apache.org/jira/browse/OAK-2891
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: upgrade
            Reporter: Chetan Mehrotra
            Priority: Minor
             Fix For: 1.3.0


LengthCachingDataStore introduced in OAK-2882 has an in memory map for keeping 
the mapping between blobId and length. This would pose issue when number of 
binaries are very large.

Instead of in memory map we should use some off heap store like MVStore of MapDB



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