[jira] [Created] (OAK-2713) High memory usage of CompactionMap

["Michael Dürig (JIRA)" <ji...@apache.org>]

Michael Dürig created OAK-2713:
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             Summary: High memory usage of CompactionMap
                 Key: OAK-2713
                 URL: https://issues.apache.org/jira/browse/OAK-2713
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: segmentmk
            Reporter: Michael Dürig
            Assignee: Michael Dürig
             Fix For: 1.3.0


In environments with a lot of volatile content the {{CompactionMap}} can end up eating a lot of memory. From {{CompactionStrategyMBean#getCompactionMapStats}}:

{noformat}
[Estimated Weight: 317,5 MB, Records: 39500094, Segments: 36698], 
[Estimated Weight: 316,4 MB, Records: 39374593, Segments: 36660], 
[Estimated Weight: 315,4 MB, Records: 39253205, Segments: 36620], 
[Estimated Weight: 315,1 MB, Records: 39221882, Segments: 36614], 
[Estimated Weight: 314,9 MB, Records: 39195490, Segments: 36604], 
[Estimated Weight: 315,0 MB, Records: 39182753, Segments: 36602], 
[Estimated Weight: 360 B, Records: 0, Segments: 0],
{noformat}


This causes compaction to be skipped:

{noformat}
2015-03-30:30.03.2015 02:00:00.038 *INFO* [] [TarMK compaction thread [/foo/bar/crx-quickstart/repository/segmentstore], active since Mon Mar 30 02:00:00 CEST 2015, previous max duration 3854982ms] org.apache.jackrabbit.oak.plugins.segment.file.FileStore Not enough available memory 5,5 GB, needed 6,3 GB, last merge delta 1,3 GB, so skipping compaction for now
{noformat}



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