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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5229) Explore building blocks for "multi-row" local transactions.
Date Fri, 03 Feb 2012 23:45:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200164#comment-13200164
] 

Hadoop QA commented on HBASE-5229:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12513190/5229-multiRow-v2.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated -136 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 156 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

     -1 core tests.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.mapreduce.TestHFileOutputFormat
                  org.apache.hadoop.hbase.mapred.TestTableMapReduce
                  org.apache.hadoop.hbase.io.hfile.TestHFileBlock
                  org.apache.hadoop.hbase.mapreduce.TestImportTsv

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/902//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/902//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/902//console

This message is automatically generated.
                
> 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-v2.txt, 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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