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https://issues.apache.org/jira/browse/HBASE-17825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373909#comment-16373909
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stack commented on HBASE-17825:
-------------------------------

bq. What are our compatibility guarantees on WALPlayer?

@InterfaceAudience.Public
public class WALPlayer extends Configured implements Tool {

A recent fix ensured hbase-1 can play hbase-2 WALs and vice-versa.

How does this change 

> Backup: further optimizations
> -----------------------------
>
>                 Key: HBASE-17825
>                 URL: https://issues.apache.org/jira/browse/HBASE-17825
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>            Priority: Critical
>              Labels: backup
>             Fix For: 3.0.0
>
>         Attachments: HBASE-17825-v1.patch, HBASE-17825-v2.patch, 
> HBASE-17825-v3.patch, HBASE-17825-v4.patch
>
>
> Some phases of backup and restore can be optimized:
> # WALPlayer support for multiple tables
> # Run DistCp once per all tables during backup/restore
> The eventual goal:
> # 2 M/R jobs per backup/restore



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