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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (RAT-138) RAT runs very slowly on some input
Date Fri, 17 May 2013 20:03:15 GMT

    [ https://issues.apache.org/jira/browse/RAT-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660995#comment-13660995
] 

Sebb commented on RAT-138:
--------------------------

Seems the problem is related to the length of the file being read, if the file does not contain
a matching string it has to be read to the end.
Javadocs are generally long and don't contain matching strings.
Not yet clear why 0.8 did not suffer from this problem.


                
> RAT runs very slowly on some input
> ----------------------------------
>
>                 Key: RAT-138
>                 URL: https://issues.apache.org/jira/browse/RAT-138
>             Project: Apache Rat
>          Issue Type: Bug
>          Components: engine
>    Affects Versions: 0.9
>            Reporter: Sebb
>              Labels: perfomance, regression
>
> Commons IO discovered that mvn site was spending a lot of time running RAT 0.9. Reverting
to 0.8 fixes the problem.
> Turns out that certain files seem to cause RAT to chew CPU in the Pattern.matcher; here
is a sample stack trace from a thread dump:
> "main" prio=6 tid=0x003c8c00 nid=0xa4c runnable [0x00a5e000]
>    java.lang.Thread.State: RUNNABLE
>         at java.util.regex.Pattern$Curly.match0(Pattern.java:4166)
>         at java.util.regex.Pattern$Curly.match(Pattern.java:4132)
>         at java.util.regex.Matcher.match(Matcher.java:1221)
>         at java.util.regex.Matcher.matches(Matcher.java:559)
>         at org.apache.rat.analysis.license.FullTextMatchingLicense.match(FullTextMatchingLicense.java:79)
>         at org.apache.rat.analysis.util.HeaderMatcherMultiplexer.match(HeaderMatcherMultiplexer.java:42)
>         at org.apache.rat.analysis.HeaderCheckWorker.readLine(HeaderCheckWorker.java:113)
>         at org.apache.rat.analysis.HeaderCheckWorker.read(HeaderCheckWorker.java:84)
>         at org.apache.rat.analysis.DocumentHeaderAnalyser.analyse(DocumentHeaderAnalyser.java:43)
>         at org.apache.rat.analysis.DefaultAnalyserFactory$DefaultAnalyser.analyse(DefaultAnalyserFactory.java:60)
>         at org.apache.rat.document.impl.util.DocumentAnalyserMultiplexer.analyse(DocumentAnalyserMultiplexer.java:37)
>         at org.apache.rat.report.claim.util.ClaimReporterMultiplexer.report(ClaimReporterMultiplexer.java:42)
>         at org.apache.rat.mp.FilesReportable.run(FilesReportable.java:68)
>         at org.apache.rat.Report.report(Report.java:393)
>         at org.apache.rat.Report.report(Report.java:373)
>         at org.apache.rat.mp.AbstractRatMojo.createReport(AbstractRatMojo.java:462)
>         at org.apache.rat.mp.RatReportMojo.createReport(RatReportMojo.java:148)
>         at org.apache.rat.mp.RatReportMojo.generate(RatReportMojo.java:310)
>         at org.apache.rat.mp.RatReportMojo.execute(RatReportMojo.java:210)
> I assume there must be a problem with one of the REs which is triggering lots of backtracking
when applied to files under site-content/, which is a working copy of:
> https://svn.apache.org/repos/infra/websites/production/commons/content/proper/commons-io
> Last Changed Rev: 861378
> This directory should not have been included in the RAT scan, but the files don't cause
problems for RAT 0.8.

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