Anastasia Braginsky commented on HBASE-17765:

[~stack], thanks for taking a look :)

The merging is existing possibility in the code and will happen if we change 
hbase.hregion.compacting.memstore.threshold in the hbase-site to be less than 
4. This JIRA intends to fixs bugs in merge and make it configurable. Under 
HBASE-16417 there is a discussion whether to make the merge part of the default 
configuration or not. This JIRA doesn't turn the merge into default. I am 
adding now a merge test to this patch and soon is going to publish a new patch.

> Reviving the merge possibility in the CompactingMemStore
> --------------------------------------------------------
>                 Key: HBASE-17765
>                 URL: https://issues.apache.org/jira/browse/HBASE-17765
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Anastasia Braginsky
>             Fix For: 2.0.0
>         Attachments: HBASE-17765-V01.patch
> According to the new performance results presented in the HBASE-16417 we see 
> that the read latency of the 90th percentile of the BASIC policy is too big 
> due to the need to traverse through too many segments in the pipeline. In 
> this JIRA we correct the bug in the merge sizing calculations and allow 
> pipeline size threshold to be a configurable parameter.

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