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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5604) HLog replay tool that generates HFiles for use by LoadIncrementalHFiles.
Date Sat, 07 Apr 2012 21:20:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249335#comment-13249335
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Lars Hofhansl commented on HBASE-5604:
--------------------------------------

Related to this, when I say point in time (PIT) restore, I mean a PIT w.r.t. to the write
time of the WAL edits (not the timestamps of the KeyValues).
Although I can see a usecase for the latter as well, especially when the timestamps are used
for snapshot isolation.


                
> 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
>         Attachments: 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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