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Posted to issues@hbase.apache.org by "jiraposter@reviews.apache.org (Commented) (JIRA)" <ji...@apache.org> on 2012/02/03 02:30:55 UTC
[jira] [Commented] (HBASE-5229) Explore building blocks for
"multi-row" local transactions.
[ https://issues.apache.org/jira/browse/HBASE-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199459#comment-13199459 ]
jiraposter@reviews.apache.org commented on HBASE-5229:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/3748/
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Review request for hbase.
Summary
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This builds on HBASE-3584, HBASE-5203, and HBASE-5304.
Multiple Rows can be locked and applied atomically as long as the application ensures that all rows reside in the same Region (by presplitting or a custom RegionSplitPolicy).
At SFDC we can use this to colocate subsets of a tenant's data and allow atomic operations over these subsets.
Obviously this is an advanced features and this prominently called out in the Javadoc.
This addresses bug HBASE-5229.
https://issues.apache.org/jira/browse/HBASE-5229
Diffs
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http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/HTable.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/HTableInterface.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/MultiRowMutation.java PRE-CREATION
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/RowMutation.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/HbaseObjectWritable.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/ipc/HRegionInterface.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/rest/client/RemoteHTable.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/client/TestFromClientSide.java 1239953
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestAtomicOperation.java 1239953
Diff: https://reviews.apache.org/r/3748/diff
Testing
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Tests added to TestFromClientSide and TestAtomicOperation
Thanks,
Lars
> Explore building blocks for "multi-row" local transactions.
> -----------------------------------------------------------
>
> Key: HBASE-5229
> URL: https://issues.apache.org/jira/browse/HBASE-5229
> Project: HBase
> Issue Type: New Feature
> Components: client, regionserver
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.94.0
>
> Attachments: 5229-multiRow.txt, 5229-seekto-v2.txt, 5229-seekto.txt, 5229.txt
>
>
> HBase should provide basic building blocks for multi-row local transactions. Local means that we do this by co-locating the data. Global (cross region) transactions are not discussed here.
> After a bit of discussion two solutions have emerged:
> 1. Keep the row-key for determining grouping and location and allow efficient intra-row scanning. A client application would then model tables as HBase-rows.
> 2. Define a prefix-length in HTableDescriptor that defines a grouping of rows. Regions will then never be split inside a grouping prefix.
> #1 is true to the current storage paradigm of HBase.
> #2 is true to the current client side API.
> I will explore these two with sample patches here.
> --------------------
> Was:
> As discussed (at length) on the dev mailing list with the HBASE-3584 and HBASE-5203 committed, supporting atomic cross row transactions within a region becomes simple.
> I am aware of the hesitation about the usefulness of this feature, but we have to start somewhere.
> Let's use this jira for discussion, I'll attach a patch (with tests) momentarily to make this concrete.
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