[jira] [Resolved] (HBASE-24659) Calculate FIXED_OVERHEAD automatically

["Michael Stack (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-24659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Stack resolved HBASE-24659.
-----------------------------------
    Fix Version/s: 2.4.0
                   3.0.0-alpha-1
     Hadoop Flags: Reviewed
       Resolution: Fixed

Pushed on branch-2 and master (pushed because I held up the commit by not responding to ping....). Thanks for the patch [~niuyulin]

> Calculate FIXED_OVERHEAD automatically
> --------------------------------------
>
>                 Key: HBASE-24659
>                 URL: https://issues.apache.org/jira/browse/HBASE-24659
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Duo Zhang
>            Assignee: niuyulin
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.4.0
>
>         Attachments: 50M-performance.pdf
>
>
> Now the FIXED_OVERHEAD in some classes are maintained manually, an we have a method to TestHeapSizes to confirm that the value is correct.
> But it is really hard for developers to count the fields in a complicated class like HRegion. Since we have the ability to calcuate the accurate size in UT, I think we it is also possible to calcuate it when loading the class, which is a one time operation so should not effect the performance too much.



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