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https://issues.apache.org/jira/browse/HBASE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250439#comment-13250439
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Lars Hofhansl commented on HBASE-5604:
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Thanks Ted.
* I'll add Javadoc.
* index of 0 is used here, since when creating HFiles for bulk import only a
single table is currently allowed (that is also documented in usage(), but
perhaps not clearly enough...?). I'll add a comment to that extent.
* That the two arrays are of the same size if guaranteed in
WALPlayer.createSubmittableJob(), but perhaps it is better to double check here.
* Checking heapSize() seems unnecessary. After all, this is single WALEdit.
> 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, 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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