Vladimir Rodionov commented on HBASE-14135:

Two issues with incremental backup implementation:

# Storage usage. WAL files are significantly larger than hfiles, especially 
when compression is enabled in hfiles
# Restore operation time. 

The most significant is the first one. We can that storage reduction factor 
will be something between 3-5 once convert (merge) is implemented.

Running conversion (merge) on a remote destination (cluster) is not feasible in 
many cases, so merge will require reading/writing data back and forth between 
source and destination.

I will postpone this feature until filtering at the source during incremental 
backup is done.

> HBase Backup/Restore Phase 3: Merge backup images
> -------------------------------------------------
>                 Key: HBASE-14135
>                 URL: https://issues.apache.org/jira/browse/HBASE-14135
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 2.0.0
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>              Labels: backup
>             Fix For: 2.0.0

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