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https://issues.apache.org/jira/browse/HBASE-14479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391276#comment-15391276
 ] 

Hadoop QA commented on HBASE-14479:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green} 0m 
0s {color} | {color:green} Patch does not have any anti-patterns. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s 
{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 
0s {color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 10m 
17s {color} | {color:green} branch-1 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 37s 
{color} | {color:green} branch-1 passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 35s 
{color} | {color:green} branch-1 passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m 
18s {color} | {color:green} branch-1 passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
32s {color} | {color:green} branch-1 passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 
52s {color} | {color:green} branch-1 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 42s 
{color} | {color:green} branch-1 passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 32s 
{color} | {color:green} branch-1 passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
45s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 38s 
{color} | {color:green} the patch passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 38s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 35s 
{color} | {color:green} the patch passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 35s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
58s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
21s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 
0s {color} | {color:green} Patch has no whitespace issues. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 14m 35s 
{color} | {color:red} Patch causes 11 errors with Hadoop v2.6.1. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 16m 20s 
{color} | {color:red} Patch causes 11 errors with Hadoop v2.6.2. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 18m 3s 
{color} | {color:red} Patch causes 11 errors with Hadoop v2.6.3. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 19m 47s 
{color} | {color:red} Patch causes 11 errors with Hadoop v2.7.1. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 9s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 25s 
{color} | {color:green} the patch passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 33s 
{color} | {color:green} the patch passed with JDK v1.7.0_80 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 85m 30s {color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
25s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 128m 56s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hbase.ipc.TestRpcClientLeaks |
|   | hadoop.hbase.procedure.TestProcedureManager |
|   | hadoop.hbase.master.balancer.TestRegionLocationFinder |
| Timed out junit tests | org.apache.hadoop.hbase.ipc.TestAsyncIPC |
|   | org.apache.hadoop.hbase.ipc.TestIPC |
|   | org.apache.hadoop.hbase.security.TestAsyncSecureIPC |
|   | org.apache.hadoop.hbase.security.TestSecureIPC |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12819843/HBASE-14479.branch-1.V5_e.patch
 |
| JIRA Issue | HBASE-14479 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux asf907.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
 |
| git revision | branch-1 / a8dd359 |
| Default Java | 1.7.0_80 |
| Multi-JDK versions |  /usr/local/jenkins/java/jdk1.8.0:1.8.0 
/home/jenkins/jenkins-slave/tools/hudson.model.JDK/JDK_1.7_latest_:1.7.0_80 |
| findbugs | v3.0.0 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/2748/artifact/patchprocess/patch-unit-hbase-server.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HBASE-Build/2748/artifact/patchprocess/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/2748/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/2748/console |
| Powered by | Apache Yetus 0.2.1   http://yetus.apache.org |


This message was automatically generated.



> Apply the Leader/Followers pattern to RpcServer's Reader
> --------------------------------------------------------
>
>                 Key: HBASE-14479
>                 URL: https://issues.apache.org/jira/browse/HBASE-14479
>             Project: HBase
>          Issue Type: Improvement
>          Components: IPC/RPC, Performance
>            Reporter: Hiroshi Ikeda
>            Assignee: Hiroshi Ikeda
>            Priority: Minor
>         Attachments: HBASE-14479-V2 (1).patch, HBASE-14479-V2.patch, 
> HBASE-14479-V2.patch, HBASE-14479-V3-experimental_branch-1.patch, 
> HBASE-14479-V4-experimental_branch-1.patch, HBASE-14479.branch-1.V5_e.patch, 
> HBASE-14479.patch, flamegraph-19152.svg, flamegraph-32667.svg, gc.png, 
> gets.png, io.png, median.png
>
>
> {{RpcServer}} uses multiple selectors to read data for load distribution, but 
> the distribution is just done by round-robin. It is uncertain, especially for 
> long run, whether load is equally divided and resources are used without 
> being wasted.
> Moreover, multiple selectors may cause excessive context switches which give 
> priority to low latency (while we just add the requests to queues), and it is 
> possible to reduce throughput of the whole server.



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