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Posted to issues@hbase.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2013/07/01 23:33:22 UTC
[jira] [Commented] (HBASE-8369) MapReduce over snapshot files
[ https://issues.apache.org/jira/browse/HBASE-8369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13697214#comment-13697214 ]
Hadoop QA commented on HBASE-8369:
----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12590305/HBASE-8369-0.94.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 4 new or modified tests.
{color:red}-1 patch{color}. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/6177//console
This message is automatically generated.
> 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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