Anoop Sam John commented on HBASE-16608:

So right now as the merge (index merge) happens with every in memory flush, the 
GC impact may be much more.. Even when we have policy , say merge when 
#segments >=3, still there will be GC impact right?  All our efforts from diff 
directions is to reduce it. So what is the adv for this merge that u can say 
other than keeping #segments less and have a bigger sized pipeline tail?

> Introducing the ability to merge ImmutableSegments without copy-compaction or 
> SQM usage
> ---------------------------------------------------------------------------------------
>                 Key: HBASE-16608
>                 URL: https://issues.apache.org/jira/browse/HBASE-16608
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Anastasia Braginsky
>         Attachments: HBASE-16417-V02.patch, HBASE-16417-V04.patch, 
> HBASE-16417-V06.patch, HBASE-16417-V07.patch, HBASE-16417-V08.patch, 
> HBASE-16417-V10.patch, HBASE-16608-V01.patch, HBASE-16608-V03.patch, 
> HBASE-16608-V04.patch, HBASE-16608-V08.patch

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