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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12436) GlobPattern regex library has performance issues with wildcard characters
Date Sat, 10 Oct 2015 01:07:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951464#comment-14951464
] 

Hadoop QA commented on HADOOP-12436:
------------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  20m 27s | Pre-patch trunk compilation is healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any @author tags.
|
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to include 1 new
or modified test files. |
| {color:green}+1{color} | javac |   8m 17s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |  10m 31s | There were no new javadoc warning messages.
|
| {color:red}-1{color} | release audit |   0m 18s | The applied patch generated 1 release
audit warnings. |
| {color:green}+1{color} | checkstyle |   1m 10s | There were no new checkstyle issues. |
| {color:green}+1{color} | whitespace |   0m  1s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 38s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   1m 53s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:red}-1{color} | common tests |   6m 36s | Tests failed in hadoop-common. |
| | |  51m 28s | |
\\
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|| Reason || Tests ||
| Failed unit tests | hadoop.net.TestDNS |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12765930/HADOOP-12436.03.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / def374e |
| Release Audit | https://builds.apache.org/job/PreCommit-HADOOP-Build/7790/artifact/patchprocess/patchReleaseAuditProblems.txt
|
| hadoop-common test log | https://builds.apache.org/job/PreCommit-HADOOP-Build/7790/artifact/patchprocess/testrun_hadoop-common.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HADOOP-Build/7790/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf900.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 |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/7790/console |


This message was automatically generated.

> GlobPattern regex library has performance issues with wildcard characters
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-12436
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12436
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 2.2.0, 2.7.1
>            Reporter: Matthew Paduano
>            Assignee: Matthew Paduano
>         Attachments: HADOOP-12436.01.patch, HADOOP-12436.02.patch, HADOOP-12436.03.patch
>
>
> java.util.regex classes have performance problems with certain wildcard patterns.  Namely,
consecutive * characters in a file name (not properly escaped as literals) will cause commands
such as "hadoop fs -ls file******name" to consume 100% CPU and probably never return in a
reasonable time (time scales with number of *'s). 
> Here is an example:
> {noformat}
> hadoop fs -touchz /user/mattp/job_1429571161900_4222-1430338332599-tda%2D%2D\\\+\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\*\\\+\\\+\\\+...%270%27%28Stage-1430338580443-39-2000-SUCCEEDED-production%2Dhigh-1430338340360.jhist
> hadoop fs -ls /user/mattp/job_1429571161900_4222-1430338332599-tda%2D%2D+******************************+++...%270%27%28Stage-1430338580443-39-2000-SUCCEEDED-production%2Dhigh-1430338340360.jhist
> {noformat}
> causes:
> {noformat}
> PID    COMMAND      %CPU   TIME  
> 14526  java         100.0  01:18.85 
> {noformat}
> Not every string of *'s causes this, but the above filename reproduces this reliably.



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