Lars Hofhansl commented on HBASE-5604:

@Stack and Ted: I'll just remove that test. The HFile pretty printer will show 
time in the same TZ as WALPlayer would parse it, which is still useful.
I'll not file an extra jira but post an addendum to this one.
> M/R tool to replay WAL files
> ----------------------------
>                 Key: HBASE-5604
>                 URL: https://issues.apache.org/jira/browse/HBASE-5604
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0, 0.96.0
>         Attachments: 5604-v10.txt, 5604-v11.txt, 5604-v4.txt, 5604-v6.txt, 
> 5604-v7.txt, 5604-v8.txt, 5604-v9.txt, HLog-5604-v3.txt
> Just an idea I had. Might be useful for restore of a backup using the HLogs.
> This could an M/R (with a mapper per HLog file).
> The tool would get a timerange and a (set of) table(s). We'd pick the right 
> HLogs based on time before the M/R job is started and then have a mapper per 
> HLog file.
> The mapper would then go through the HLog, filter all WALEdits that didn't 
> fit into the time range or are not any of the tables and then uses 
> HFileOutputFormat to generate HFiles.
> Would need to indicate the splits we want, probably from a live table.

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