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https://issues.apache.org/jira/browse/HBASE-15180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123913#comment-15123913
 ] 

Hadoop QA commented on HBASE-15180:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s 
{color} | {color:blue} Docker mode activated. {color} |
| {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 3 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m 
39s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m 5s 
{color} | {color:green} master passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 37s 
{color} | {color:green} master passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 8m 
12s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
50s {color} | {color:green} master passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 1m 0s 
{color} | {color:red} hbase-common in master has 1 extant Findbugs warnings. 
{color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 2m 47s 
{color} | {color:red} hbase-server in master has 1 extant Findbugs warnings. 
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 53s 
{color} | {color:green} master passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 46s 
{color} | {color:green} master passed with JDK v1.7.0_91 {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red} 0m 21s 
{color} | {color:red} hbase-client in the patch failed. {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red} 0m 37s 
{color} | {color:red} hbase-server in the patch failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red} 0m 43s 
{color} | {color:red} hbase-server in the patch failed with JDK v1.8.0_72. 
{color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 0m 43s {color} 
| {color:red} hbase-server in the patch failed with JDK v1.8.0_72. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red} 0m 35s 
{color} | {color:red} hbase-server in the patch failed with JDK v1.7.0_91. 
{color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 0m 35s {color} 
| {color:red} hbase-server in the patch failed with JDK v1.7.0_91. {color} |
| {color:black}{color} | {color:black} checkstyle {color} | {color:black} 1m 
23s {color} | {color:black} Patch generated 2 new checkstyle issues in 
hbase-common (total was 100, now 102). {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
57s {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:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
30m 36s {color} | {color:green} Patch does not cause any errors with Hadoop 
2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.1 2.6.2 2.6.3 2.7.1. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 1m 29s 
{color} | {color:red} hbase-common introduced 1 new FindBugs issues. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m 15s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m 3s 
{color} | {color:green} the patch passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m 37s 
{color} | {color:green} hbase-client in the patch passed with JDK v1.8.0_72. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 2m 53s 
{color} | {color:green} hbase-common in the patch passed with JDK v1.8.0_72. 
{color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 0m 49s {color} 
| {color:red} hbase-server in the patch failed with JDK v1.8.0_72. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m 26s 
{color} | {color:green} hbase-client in the patch passed with JDK v1.7.0_91. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 2m 23s 
{color} | {color:green} hbase-common in the patch passed with JDK v1.7.0_91. 
{color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 0m 41s {color} 
| {color:red} hbase-server in the patch failed with JDK v1.7.0_91. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
32s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 92m 10s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:hbase-common |
|  |  Dead store to cell in 
org.apache.hadoop.hbase.io.CellReadableByteArrayInputStream.readCell(int, 
boolean)  At 
CellReadableByteArrayInputStream.java:org.apache.hadoop.hbase.io.CellReadableByteArrayInputStream.readCell(int,
 boolean)  At CellReadableByteArrayInputStream.java:[line 54] |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.9.1 Server=1.9.1 Image:yetus/hbase:date2016-01-29 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12785187/HBASE-15180_v2.patch |
| JIRA Issue | HBASE-15180 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux b8558efdba28 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@2/component/dev-support/hbase-personality.sh
 |
| git revision | master / 0de221a |
| findbugs | v3.0.0 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/branch-findbugs-hbase-common-warnings.html
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/branch-findbugs-hbase-server-warnings.html
 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-mvninstall-hbase-client.txt
 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-mvninstall-hbase-server.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-compile-hbase-server-jdk1.8.0_72.txt
 |
| javac | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-compile-hbase-server-jdk1.8.0_72.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-compile-hbase-server-jdk1.7.0_91.txt
 |
| javac | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-compile-hbase-server-jdk1.7.0_91.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/diff-checkstyle-hbase-common.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/new-findbugs-hbase-common.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-unit-hbase-server-jdk1.8.0_72.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/artifact/patchprocess/patch-unit-hbase-server-jdk1.7.0_91.txt
 |
| JDK v1.7.0_91  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/testReport/ |
| modules | C: hbase-client hbase-common hbase-server U: . |
| Max memory used | 175MB |
| Powered by | Apache Yetus 0.1.0   http://yetus.apache.org |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/350/console |


This message was automatically generated.



> Reduce garbage created while reading Cells from Codec Decoder
> -------------------------------------------------------------
>
>                 Key: HBASE-15180
>                 URL: https://issues.apache.org/jira/browse/HBASE-15180
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15180.patch, HBASE-15180_v2.patch
>
>
> In KeyValueDecoder#parseCell (Default Codec decoder) we use 
> KeyValueUtil#iscreate to read cells from the InputStream. Here we 1st create 
> a byte[] of length 4 and read the cell length and then an array of Cell's 
> length and read in cell bytes into it and create a KV.
> Actually in server we read the reqs into a byte[] and CellScanner is created 
> on top of a ByteArrayInputStream on top of this. By default in write path, we 
> have MSLAB usage ON. So while adding Cells to memstore, we will copy the Cell 
> bytes to MSLAB memory chunks (default 2 MB size) and recreate Cells over that 
> bytes.  So there is no issue if we create Cells over the RPC read byte[] 
> directly here in Decoder.  No need for 2 byte[] creation and copy for every 
> Cell in request.
> My plan is to make a Cell aware ByteArrayInputStream which can read Cells 
> directly from it.  
> Same Codec path is used in client side also. There better we can avoid this 
> direct Cell create and continue to do the copy to smaller byte[]s path.  Plan 
> to introduce some thing like a CodecContext associated with every Codec 
> instance which can say the server/client context.



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