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jirapos...@reviews.apache.org commented on HBASE-5229: ------------------------------------------------------ bq. On 2012-02-03 04:45:54, Ted Yu wrote: bq. > http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/RowMutation.java, line 96 bq. > <https://reviews.apache.org/r/3748/diff/1/?file=72040#file72040line96> bq. > bq. > version would be read / written twice, right ? bq. bq. Lars Hofhansl wrote: bq. Yes. Need to fix that. And actually this is what I had in mind too. Both MultiRowMutation and RowMution write their version. MultiRowMutation knowns to serialize mutations, that process needs to be versioned. RowMutation adds some fields on top of that, those also need to be versioned. Maybe the two should be entirely independent (at the expense of a few duplicated lines of code) so that they can evolve independently. - Lars ----------------------------------------------------------- This is an automatically generated e-mail. To reply, visit: https://reviews.apache.org/r/3748/#review4788 ----------------------------------------------------------- On 2012-02-03 01:29:58, Lars Hofhansl wrote: bq. bq. ----------------------------------------------------------- bq. This is an automatically generated e-mail. To reply, visit: bq. https://reviews.apache.org/r/3748/ bq. ----------------------------------------------------------- bq. bq. (Updated 2012-02-03 01:29:58) bq. bq. bq. Review request for hbase. bq. bq. bq. Summary bq. ------- bq. bq. This builds on HBASE-3584, HBASE-5203, and HBASE-5304. bq. bq. 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). bq. At SFDC we can use this to colocate subsets of a tenant's data and allow atomic operations over these subsets. bq. bq. Obviously this is an advanced features and this prominently called out in the Javadoc. bq. bq. bq. This addresses bug HBASE-5229. bq. https://issues.apache.org/jira/browse/HBASE-5229 bq. bq. bq. Diffs bq. ----- bq. bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/HTable.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/HTableInterface.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/MultiRowMutation.java PRE-CREATION bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/RowMutation.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/HbaseObjectWritable.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/ipc/HRegionInterface.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/rest/client/RemoteHTable.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/client/TestFromClientSide.java 1239953 bq. http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestAtomicOperation.java 1239953 bq. bq. Diff: https://reviews.apache.org/r/3748/diff bq. bq. bq. Testing bq. ------- bq. bq. Tests added to TestFromClientSide and TestAtomicOperation bq. bq. bq. Thanks, bq. bq. Lars bq. bq. > 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. -- This message is automatically generated by JIRA. 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