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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Created] (OAK-2939) Make compaction gain estimate more accurate
Date Mon, 01 Jun 2015 10:48:17 GMT
Michael Dürig created OAK-2939:
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             Summary: Make compaction gain estimate more accurate
                 Key: OAK-2939
                 URL: https://issues.apache.org/jira/browse/OAK-2939
             Project: Jackrabbit Oak
          Issue Type: Sub-task
          Components: segmentmk
            Reporter: Michael Dürig
            Assignee: Michael Dürig
             Fix For: 1.3.1


Currently the compaction gain estimation process only takes the current head into account
when calculating the retained size. We could make it more accurate by also taking in memory
references into account. This would prevent compaction from running when many in memory references
would later on prevent segments from being cleaned up. 

Also for OAK-2862, we would need a way to include the segments used for the persisted compaction
map in the retained size. 

While at it, we could try to improve logging so information on how much space is retained
by the current head, in memory references and the persisted compaction map would be logged
separately. 



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