[ 
https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14731555#comment-14731555
 ] 

Hadoop QA commented on HBASE-12751:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12754273/12751.rebased.v25.txt
  against master branch at commit 2969093b5b39cb950d8710cfffa7e55484d40259.
  ATTACHMENT ID: 12754273

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:green}+1 tests included{color}.  The patch appears to include 87 new 
or modified tests.

                    {color:red}-1 Anti-pattern{color}.  The patch appears to 
have anti-pattern where BYTES_COMPARATOR was omitted:
             -        getRegionInfo(), -1, new TreeMap<byte[], List<Path>>());.

    {color:green}+1 hadoop versions{color}. The patch compiles with all 
supported hadoop versions (2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.7.0 2.7.1)

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the 
total number of protoc compiler warnings.

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 2 
warning messages.

                {color:red}-1 checkstyle{color}.  The applied patch generated 
1840 checkstyle errors (more than the master's current 1834 errors).

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:red}-1 lineLengths{color}.  The patch introduces the following lines 
longer than 100:
    +      final long now, List<UUID> clusterIds, long nonceGroup, long nonce, 
MultiVersionConcurrencyControl mvcc) {
+      long logSeqNum, final long now, List<UUID> clusterIds, long nonceGroup, 
long nonce, MultiVersionConcurrencyControl mvcc) {
+      long txid = log.append(htd, hri, new WALKey(hri.getEncodedNameAsBytes(), 
hri.getTable(), now, mvcc),
+        new WALKey(info.getEncodedNameAsBytes(), htd.getTableName(), 
System.currentTimeMillis(), mvcc),
+        new WALKey(hri.getEncodedNameAsBytes(), htd.getTableName(), 
System.currentTimeMillis(), mvcc),
+            final WALKey logkey = new WALKey(hri.getEncodedNameAsBytes(), 
hri.getTable(), now, mvcc);

  {color:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       
org.apache.hadoop.hbase.coprocessor.TestRegionObserverStacking
                  org.apache.hadoop.hbase.filter.TestFilter
                  org.apache.hadoop.hbase.filter.TestInvocationRecordFilter
                  
org.apache.hadoop.hbase.io.encoding.TestSeekBeforeWithReverseScan
                  org.apache.hadoop.hbase.regionserver.TestKeepDeletes
                  org.apache.hadoop.hbase.filter.TestDependentColumnFilter
                  
org.apache.hadoop.hbase.regionserver.TestDefaultCompactSelection
                  org.apache.hadoop.hbase.filter.TestMultipleColumnPrefixFilter
                  
org.apache.hadoop.hbase.io.hfile.TestScannerSelectionUsingKeyRange
                  org.apache.hadoop.hbase.filter.TestColumnPrefixFilter
                  org.apache.hadoop.hbase.regionserver.TestSplitTransaction
                  org.apache.hadoop.hbase.regionserver.TestResettingCounters
                  org.apache.hadoop.hbase.regionserver.TestMinVersions
                  org.apache.hadoop.hbase.regionserver.TestScanner
                  org.apache.hadoop.hbase.mob.mapreduce.TestMobSweepMapper
                  org.apache.hadoop.hbase.io.encoding.TestPrefixTree
                  org.apache.hadoop.hbase.procedure.TestProcedureManager
                  org.apache.hadoop.hbase.regionserver.TestWideScanner
                  org.apache.hadoop.hbase.master.TestCatalogJanitor
                  org.apache.hadoop.hbase.client.TestIntraRowPagination
                  org.apache.hadoop.hbase.regionserver.TestColumnSeeking
                  org.apache.hadoop.hbase.coprocessor.TestCoprocessorInterface
                  org.apache.hadoop.hbase.regionserver.TestBlocksScanned
                  org.apache.hadoop.hbase.mob.TestMobFileCache
                  org.apache.hadoop.hbase.regionserver.TestHRegionInfo
                  
org.apache.hadoop.hbase.regionserver.TestRegionMergeTransaction
                  org.apache.hadoop.hbase.regionserver.TestScanWithBloomError
                  org.apache.hadoop.hbase.regionserver.TestBulkLoad

     {color:red}-1 core zombie tests{color}.  There are 1 zombie test(s):       
at 
org.apache.camel.component.yammer.YammerMultipleUsersRouteTest.testConsumeAllUsers(YammerMultipleUsersRouteTest.java:36)

Test results: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15422//testReport/
Release Findbugs (version 2.0.3)        warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15422//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15422//artifact/patchprocess/checkstyle-aggregate.html

                Javadoc warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15422//artifact/patchprocess/patchJavadocWarnings.txt
Console output: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15422//console

This message is automatically generated.

> Allow RowLock to be reader writer
> ---------------------------------
>
>                 Key: HBASE-12751
>                 URL: https://issues.apache.org/jira/browse/HBASE-12751
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 2.0.0, 1.3.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: 12751.rebased.v25.txt, 12751v22.txt, 12751v23.txt, 
> 12751v23.txt, 12751v23.txt, 12751v23.txt, HBASE-12751-v1.patch, 
> HBASE-12751-v10.patch, HBASE-12751-v10.patch, HBASE-12751-v11.patch, 
> HBASE-12751-v12.patch, HBASE-12751-v13.patch, HBASE-12751-v14.patch, 
> HBASE-12751-v15.patch, HBASE-12751-v16.patch, HBASE-12751-v17.patch, 
> HBASE-12751-v18.patch, HBASE-12751-v19 (1).patch, HBASE-12751-v19.patch, 
> HBASE-12751-v2.patch, HBASE-12751-v20.patch, HBASE-12751-v20.patch, 
> HBASE-12751-v21.patch, HBASE-12751-v3.patch, HBASE-12751-v4.patch, 
> HBASE-12751-v5.patch, HBASE-12751-v6.patch, HBASE-12751-v7.patch, 
> HBASE-12751-v8.patch, HBASE-12751-v9.patch, HBASE-12751.patch
>
>
> Right now every write operation grabs a row lock. This is to prevent values 
> from changing during a read modify write operation (increment or check and 
> put). However it limits parallelism in several different scenarios.
> If there are several puts to the same row but different columns or stores 
> then this is very limiting.
> If there are puts to the same column then mvcc number should ensure a 
> consistent ordering. So locking is not needed.
> However locking for check and put or increment is still needed.



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