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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17849) PE tool random read is not totally random
Date Wed, 05 Apr 2017 06:51:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956394#comment-15956394
] 

Hadoop QA commented on HBASE-17849:
-----------------------------------

| (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 19s {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 2 new or modified test files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 4m 13s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 52s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 56s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 19s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 18s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 33s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 57s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 49s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 49s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 55s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 16s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 0s {color}
| {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 33m 14s {color}
| {color:green} Patch does not cause any errors with Hadoop 2.6.1 2.6.2 2.6.3 2.6.4 2.6.5
2.7.1 2.7.2 2.7.3 or 3.0.0-alpha2. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 59s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 28s {color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 24m 13s {color} | {color:red}
hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 14s {color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 72m 57s {color} | {color:black}
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|| Reason || Tests ||
| Failed junit tests | hadoop.hbase.TestPerformanceEvaluation |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.12.3 Server=1.12.3 Image:yetus/hbase:8d52d23 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12862010/HBASE-17849.patch
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| JIRA Issue | HBASE-17849 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  hbaseanti  checkstyle
 compile  |
| uname | Linux cc5b8d1256af 3.13.0-106-generic #153-Ubuntu SMP Tue Dec 6 15:44:32 UTC 2016
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 / 910b680 |
| Default Java | 1.8.0_121 |
| findbugs | v3.0.0 |
| unit | https://builds.apache.org/job/PreCommit-HBASE-Build/6320/artifact/patchprocess/patch-unit-hbase-server.txt
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| unit test logs |  https://builds.apache.org/job/PreCommit-HBASE-Build/6320/artifact/patchprocess/patch-unit-hbase-server.txt
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|  Test Results | https://builds.apache.org/job/PreCommit-HBASE-Build/6320/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/6320/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> PE tool random read is not totally random
> -----------------------------------------
>
>                 Key: HBASE-17849
>                 URL: https://issues.apache.org/jira/browse/HBASE-17849
>             Project: HBase
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17849.patch, HBASE-17849.patch
>
>
> Recently we were using the PE tool for doing some bucket cache related performance tests.
One thing that we noted was that the way the random read works is not totally random.
> Suppose we load 200G of data using --size param and then we use --rows=500000 to do the
randomRead. The assumption was among the 200G of data it could generate randomly 500000 row
keys to do the reads.
> But it so happens that the PE tool generates random rows only on those set of row keys
which falls under the first 500000 rows. 
> This was quite evident when we tried to use HBASE-15314 in our testing. Suppose we split
the bucket cache of size 200G into 2 files each 100G the randomReads with --rows=500000 always
lands in the first file and not in the 2nd file. Better to make PE purely random.



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