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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15203) Reduce garbage created by path.toString() during Checksum verification
Date Tue, 02 Feb 2016 15:10:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128378#comment-15128378
] 

Hadoop QA commented on HBASE-15203:
-----------------------------------

| (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:red}-1{color} | {color:red} test4tests {color} | {color:red} 0m 0s {color} | {color:red}
The patch doesn't appear to include any new or modified tests. Please justify why no new tests
are needed for this patch. Also please list what manual steps were performed to verify this
patch. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m 22s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 4s {color} | {color:green}
master passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 51s {color} |
{color:green} master passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 4m 31s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 24s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 48s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 48s {color} |
{color:green} master passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 52s {color} |
{color:green} master passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 4s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 1s {color} | {color:green}
the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 1s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 52s {color} |
{color:green} the patch passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 52s {color} | {color:green}
the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 4m 51s {color} | {color:red}
Patch generated 1 new checkstyle issues in hbase-server (total was 54, now 55). {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 24s {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} 31m 5s {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:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m 4s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 57s {color} |
{color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 54s {color} |
{color:green} the patch passed with JDK v1.7.0_91 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 164m 17s {color} | {color:red}
hbase-server in the patch failed with JDK v1.8.0_72. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 106m 53s {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 30s {color}
| {color:green} Patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 331m 11s {color} | {color:black}
{color} |
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|| Reason || Tests ||
| JDK v1.8.0_72 Failed junit tests | hadoop.hbase.mapreduce.TestImportTsv |
|   | hadoop.hbase.client.TestAdmin1 |
| JDK v1.8.0_72 Timed out junit tests | org.apache.hadoop.hbase.snapshot.TestMobSecureExportSnapshot
|
|   | org.apache.hadoop.hbase.snapshot.TestSecureExportSnapshot |
|   | org.apache.hadoop.hbase.snapshot.TestMobExportSnapshot |
|   | org.apache.hadoop.hbase.snapshot.TestExportSnapshot |
| JDK v1.7.0_91 Failed junit tests | hadoop.hbase.mapreduce.TestCopyTable |
| JDK v1.7.0_91 Timed out junit tests | org.apache.hadoop.hbase.client.TestMultiRespectsLimits
|
|   | org.apache.hadoop.hbase.client.TestAdmin1 |
|   | org.apache.hadoop.hbase.client.TestFromClientSideWithCoprocessor |
|   | org.apache.hadoop.hbase.client.TestHCM |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.9.1 Server=1.9.1 Image:yetus/hbase:date2016-02-02 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12785745/HBASE-15203_1.patch
|
| JIRA Issue | HBASE-15203 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  hbaseanti  checkstyle
 compile  |
| uname | Linux cd49845658d7 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 | master / fc5e698 |
| findbugs | v3.0.0 |
| checkstyle | https://builds.apache.org/job/PreCommit-HBASE-Build/394/artifact/patchprocess/diff-checkstyle-hbase-server.txt
|
| unit | https://builds.apache.org/job/PreCommit-HBASE-Build/394/artifact/patchprocess/patch-unit-hbase-server-jdk1.8.0_72.txt
|
| unit | https://builds.apache.org/job/PreCommit-HBASE-Build/394/artifact/patchprocess/patch-unit-hbase-server-jdk1.7.0_91.txt
|
| unit test logs |  https://builds.apache.org/job/PreCommit-HBASE-Build/394/artifact/patchprocess/patch-unit-hbase-server-jdk1.8.0_72.txt
https://builds.apache.org/job/PreCommit-HBASE-Build/394/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/394/testReport/
|
| modules | C: hbase-server U: hbase-server |
| Max memory used | 327MB |
| Powered by | Apache Yetus 0.1.0   http://yetus.apache.org |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/394/console |


This message was automatically generated.



> Reduce garbage created by path.toString() during Checksum verification
> ----------------------------------------------------------------------
>
>                 Key: HBASE-15203
>                 URL: https://issues.apache.org/jira/browse/HBASE-15203
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15203.patch, HBASE-15203_1.patch
>
>
> When we try to read a block we do checksum verification for which we need the file name
in which the block belongs to. So we do Path.toString() every time. This seems to create around
163MB of char[] that is garbage collected in a simple scan run. It is also visible in writes
but the impact is lesser. In overall write/read profile the top 2 factors are byte[] and char[].
This toString() can easily be avoided and reduce its share from the total. To make it more
precise in 1 min of profiling, among the 1.8G of garbage created by StringBuilder.toString
- this path.toString() was contributing around 3.5%. After the patch this is totally not there.




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