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https://issues.apache.org/jira/browse/HBASE-8369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Keller updated HBASE-8369:
--------------------------------
Labels: newbie (was: )
Affects Version/s: 0.94.8
Release Note: Snapshot map-reduce scan functionality for 0.94. This is
new functionality only and should not affect other
Status: Patch Available (was: Open)
This patch is based on Enis's patch and backported to 0.94. I added a couple of
things, like factoring in data locality when assigning splits, and making the
temp directory a parameter. The big downside so far to these patches is that
the map-reduce job needs to be run by a user that has write access to files in
the HBase data directory.
> 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
> Affects Versions: 0.94.8
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Labels: newbie
> Fix For: 0.98.0, 0.95.2
>
> Attachments: HBASE-8369-0.94.patch, 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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