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https://issues.apache.org/jira/browse/HBASE-18070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17232501#comment-17232501
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Michael Stack commented on HBASE-18070:
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{quote}I do not think the approach for meta replica is for performance?
{quote}
That is right.
(I just observe that there no perf improvement nor regression).
{quote}The general read replica feature is not designed for performance either,
it is designed for availability.
{quote}
That is right.
{quote}And for meta replica, I think what we need is to verify that, our
cluster could still be functional under heavy load on loaction lookup while the
cluster without this feature on will be dead.
{quote}
I do not think we need to prove that here. Meta Read Replicas have been in
place for years. Commit of this feature does not need to revisit justification
of the original read replica feature.
This feature is about distributing load on hbase:meta. See tail of HBASE-25127
for illustration it is effective on this front.
{quote}So I think what we need to test here, is to write a special test which
will clearRegionLocationCache everytime before issuing the actual read/write
scan request, to simulate bad client behavior. The cluster without this feature
should be dead soon and the cluster with this feature should perform much
better. Of course if you put too many loads then no cluster could be alive, but
we only need to prove that, we can perform better.
{quote}
Hasn't this been done justifying original submission of read replica feature?
Why repeat?
> Enable memstore replication for meta replica
> --------------------------------------------
>
> Key: HBASE-18070
> URL: https://issues.apache.org/jira/browse/HBASE-18070
> Project: HBase
> Issue Type: New Feature
> Reporter: Hua Xiang
> Assignee: Huaxiang Sun
> Priority: Critical
> Fix For: 3.0.0-alpha-1, 2.4.0, HBASE-18070, HBASE-18070.branch-2
>
>
> Based on the current doc, memstore replication is not enabled for meta
> replica. Memstore replication will be a good improvement for meta replica.
> Create jira to track this effort (feasibility, design, implementation, etc).
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