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https://issues.apache.org/jira/browse/HBASE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242584#comment-13242584
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Lars Hofhansl commented on HBASE-5604:
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Ok... I'll do a separate tool called WALPlayer. The Import rationale would be
that indeed right now it can import HLog files. I added HFiles output to Import
in HBASE-5440.
HDFS would probably not work, as these files would be copied around for
archiving.
Changing the names of WALs is interesting. I'd be worried about side-effects to
other tools.
Maybe it's not even an issue. A reader of the HLog can tell after looking at
the first log entries whether it can ignore the rest of the file.
> HLog replay tool that generates HFiles for use by LoadIncrementalHFiles.
> ------------------------------------------------------------------------
>
> Key: HBASE-5604
> URL: https://issues.apache.org/jira/browse/HBASE-5604
> Project: HBase
> Issue Type: New Feature
> Reporter: Lars Hofhansl
>
> 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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