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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5604) HLog replay tool that generates HFiles for use by LoadIncrementalHFiles.
Date Wed, 21 Mar 2012 02:06:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234032#comment-13234032
] 

stack commented on HBASE-5604:
------------------------------

Oh, hfile has to be sorted too.  At log splitting time, would probably end up writing lots
of small hfiles... one per WAL split say.  Could make for more i/o though might in long run
though it could also get region back online faster.
                
> 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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