Lars Hofhansl commented on HBASE-5604:

Sigh... That's exactly what I was afraid about when adding data parsing.
What timezone is used to store the WAL edit? Is it GMT? If so, the date should 
be interpreted as GMT.
If the data in the WAL is always the local TZ, I should remove the date 
verification test (which in a sense is pointless anyway, because it just tests 
whether SimpleDateFormat works).
> 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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