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https://issues.apache.org/jira/browse/HBASE-8369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640583#comment-13640583
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Nick Dimiduk commented on HBASE-8369:
-------------------------------------
I like this looks of this patch, [~enis]. I noticed this:
{noformat}
+ Path tableDir = new Path(new Path("/users/enis"),
UUID.randomUUID().toString()); //TODO change this, delete afterwards
{noformat}
In mind of establishing the working directory, MR jobs working with HFiles
should have something similar. Ie, the partitions file used by
{{HFileOutputFormat}} really shouldn't assume tmp (see this
[comment|https://issues.apache.org/jira/browse/HBASE-4285?focusedCommentId=13620294&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13620294]),
and I'll need a working directory to implement HBASE-8073. It would be nice to
consolidate this concept into a single user-configured place. Separate JIRA?
> MapReduce over snapshot files
> -----------------------------
>
> Key: HBASE-8369
> URL: https://issues.apache.org/jira/browse/HBASE-8369
> Project: HBase
> Issue Type: New Feature
> Components: mapreduce, snapshots
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 0.98.0, 0.95.2
>
> Attachments: hbase-8369_v0.patch
>
>
> The idea is to add an InputFormat, which can run the mapreduce job over
> snapshot files directly bypassing hbase server layer. The IF is similar in
> usage to TableInputFormat, taking a Scan object from the user, but instead of
> running from an online table, it runs from a table snapshot. We do one split
> per region in the snapshot, and open an HRegion inside the RecordReader. A
> RegionScanner is used internally for doing the scan without any HRegionServer
> bits.
> Users have been asking and searching for ways to run MR jobs by reading
> directly from hfiles, so this allows new use cases if reading from stale data
> is ok:
> - Take snapshots periodically, and run MR jobs only on snapshots.
> - Export snapshots to remote hdfs cluster, run the MR jobs at that cluster
> without HBase cluster.
> - (Future use case) Combine snapshot data with online hbase data: Scan from
> yesterday's snapshot, but read today's data from online hbase cluster.
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