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From "genericqa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15206) BZip2 drops and duplicates records when input split size is small
Date Thu, 15 Feb 2018 22:18:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16366339#comment-16366339
] 

genericqa commented on HADOOP-15206:
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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 21s{color} | {color:blue}
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|| || || || {color:brown} Prechecks {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:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m 23s{color} | {color:blue}
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| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 17m  2s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 16m 48s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 15s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 48s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 15m 23s{color}
| {color:green} branch has no errors when building and testing our client artifacts. {color}
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 13s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 17s{color} |
{color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 15s{color} | {color:blue}
Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 12s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 13m  8s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 13m  8s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 18s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m  5s{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} shadedclient {color} | {color:green} 10m 44s{color}
| {color:green} patch has no errors when building and testing our client artifacts. {color}
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 26s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 29s{color} |
{color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  9m 11s{color} | {color:green}
hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}126m 38s{color} | {color:red}
hadoop-mapreduce-client-jobclient in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 43s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}226m 57s{color} | {color:black}
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|| Reason || Tests ||
| Failed junit tests | hadoop.mapreduce.v2.TestMRJobs |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:5b98639 |
| JIRA Issue | HADOOP-15206 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12910782/HADOOP-15206.008.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  shadedclient
 findbugs  checkstyle  |
| uname | Linux 62fa7bbdb8e3 3.13.0-135-generic #184-Ubuntu SMP Wed Oct 18 11:55:51 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / da59acd |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_151 |
| findbugs | v3.1.0-RC1 |
| unit | https://builds.apache.org/job/PreCommit-HADOOP-Build/14136/artifact/out/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HADOOP-Build/14136/testReport/ |
| Max. process+thread count | 1363 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient
U: . |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/14136/console |
| Powered by | Apache Yetus 0.8.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> BZip2 drops and duplicates records when input split size is small
> -----------------------------------------------------------------
>
>                 Key: HADOOP-15206
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15206
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.8.3, 3.0.0
>            Reporter: Aki Tanaka
>            Assignee: Aki Tanaka
>            Priority: Major
>         Attachments: HADOOP-15206-test.patch, HADOOP-15206.001.patch, HADOOP-15206.002.patch,
HADOOP-15206.003.patch, HADOOP-15206.004.patch, HADOOP-15206.005.patch, HADOOP-15206.006.patch,
HADOOP-15206.007.patch, HADOOP-15206.008.patch
>
>
> BZip2 can drop and duplicate record when input split file is small. I confirmed that
this issue happens when the input split size is between 1byte and 4bytes.
> I am seeing the following 2 problem behaviors.
>  
> 1. Drop record:
> BZip2 skips the first record in the input file when the input split size is small
>  
> Set the split size to 3 and tested to load 100 records (0, 1, 2..99)
> {code:java}
> 2018-02-01 10:52:33,502 INFO  [Thread-17] mapred.TestTextInputFormat (TestTextInputFormat.java:verifyPartitions(317))
- splits[1]=file:/work/count-mismatch2/hadoop/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/target/test-dir/TestTextInputFormat/test.bz2:3+3
count=99{code}
> > The input format read only 99 records but not 100 records
>  
> 2. Duplicate Record:
> 2 input splits has same BZip2 records when the input split size is small
>  
> Set the split size to 1 and tested to load 100 records (0, 1, 2..99)
>  
> {code:java}
> 2018-02-01 11:18:49,309 INFO [Thread-17] mapred.TestTextInputFormat (TestTextInputFormat.java:verifyPartitions(318))
- splits[3]=file /work/count-mismatch2/hadoop/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/target/test-dir/TestTextInputFormat/test.bz2:3+1
count=99
> 2018-02-01 11:18:49,310 WARN [Thread-17] mapred.TestTextInputFormat (TestTextInputFormat.java:verifyPartitions(308))
- conflict with 1 in split 4 at position 8
> {code}
>  
> I experienced this error when I execute Spark (SparkSQL) job under the following conditions:
> * The file size of the input files are small (around 1KB)
> * Hadoop cluster has many slave nodes (able to launch many executor tasks)
>  



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