[jira] [Commented] (HBASE-5604) HLog replay tool that generates HFiles for use by LoadIncrementalHFiles.

["Lars Hofhansl (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13248005#comment-13248005 ] 

Lars Hofhansl commented on HBASE-5604:
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bq. Should we rename WALs on close so they have the start and end time as their name?

Thinking more about this. It would be quite useful, possibly for other cases in the future, if one could tell by the file the exact time range of the edits.
Do you have a feeling for what (if anything) this would break?

                
> 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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