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Posted to issues@hbase.apache.org by "Enis Soztutar (JIRA)" <ji...@apache.org> on 2016/06/03 03:56:59 UTC

[jira] [Created] (HBASE-15950) We are grossly overestimating the memstore size

Enis Soztutar created HBASE-15950:
-------------------------------------

             Summary: We are grossly overestimating the memstore size
                 Key: HBASE-15950
                 URL: https://issues.apache.org/jira/browse/HBASE-15950
             Project: HBase
          Issue Type: Bug
            Reporter: Enis Soztutar
             Fix For: 2.0.0


While testing something else, I was loading a region with a lot of data. Writing 30M cells in 1M rows, with 1 byte values. 

The memstore size turned out to be estimated as 4.5GB, while with the JFR profiling I can see that we are using 2.8GB for all the objects in the memstore (KV + KV byte[] + CSLM.Node + CSLM.Index). 

This obviously means that there is room in the write cache that we are not effectively using. 



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