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https://issues.apache.org/jira/browse/HBASE-19161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16237045#comment-16237045
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Chia-Ping Tsai commented on HBASE-19161:
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The default impl of memstore for system table was compacting memstore.
HBASE-18994 added the {{hbase.systemtables.compacting.memstore.type}} to enable
the DefaultMemStore by default for system table.
> For system tables, if config 'hbase.systemtables.compacting.memstore.type' is
> not specified then DefaultMemStore is used
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-19161
> URL: https://issues.apache.org/jira/browse/HBASE-19161
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 2.0.0-alpha-4
> Reporter: Umesh Agashe
> Assignee: Umesh Agashe
> Priority: Minor
> Fix For: 2.0.0-beta-1
>
>
> For system tables, if config 'hbase.systemtables.compacting.memstore.type' is
> not specified then code default 'NONE' is used which causes instantiation of
> DefaultMemStore class. That means for everyone to use CompactingMemStore
> they need to specify this config value. Reversing it will help i.e. if user
> explicitly specifies 'hbase.systemtables.compacting.memstore.type' to 'NONE'
> then only DefaultMemStore class is used.
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