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From "Lars Hofhansl (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5604) HLog replay tool that generates HFiles for use by LoadIncrementalHFiles.
Date Tue, 10 Apr 2012 01:03:17 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-5604:
---------------------------------

    Release Note: 
Tool to replay WAL files using a M/R job.

The WAL can be replayed for a set of tables or all tables, and a timerange can be provided
(in milliseconds).
The WAL is filtered to this set of tables, the output can optionally be mapped to another
set of tables.

WAL replay can also generate HFiles for later bulk importing, in that case the WAL is replayed
for a single table only.

    
> 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
>            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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