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https://issues.apache.org/jira/browse/HBASE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250959#comment-13250959
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Lars Hofhansl commented on HBASE-5604:
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* Let's not overkill on the exceptions. This is an inner class of WALPlayer,
WALPlayer will always pass the correct arguments. Maybe I'll make the mapper
classed private and remove all exception handling.
* Thought about using SimpleDateFormat, then punted. I guess you're right,
should make it bit more user friendly.
* The TODO was left over. Not sure that even makes sense.
> M/R tools 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
> Attachments: 5604-v4.txt, 5604-v6.txt, 5604-v7.txt, 5604-v8.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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