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From "Sebb (JIRA)" <>
Subject [jira] [Reopened] (RAT-138) RAT runs very slowly on some input
Date Sun, 19 May 2013 12:35:15 GMT


Sebb reopened RAT-138:

Same problem applies to AppliedApacheSoftwareLicense20.

This detects the copyright header and then buffers everything until it matches the rest of
the license.

This could use the same approach as the FullText case, however that would allow the Copyright
and body to be widely separated, which is not ideal. But at least it would avoid the long
run time.
> RAT runs very slowly on some input
> ----------------------------------
>                 Key: RAT-138
>                 URL:
>             Project: Apache Rat
>          Issue Type: Bug
>          Components: engine
>    Affects Versions: 0.8, 0.9
>            Reporter: Sebb
>              Labels: perfomance, regression
>             Fix For: 0.10
> 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$Curly.match0(
>         at java.util.regex.Pattern$Curly.match(
>         at java.util.regex.Matcher.match(
>         at java.util.regex.Matcher.matches(
>         at org.apache.rat.analysis.license.FullTextMatchingLicense.match(
>         at org.apache.rat.analysis.util.HeaderMatcherMultiplexer.match(
>         at org.apache.rat.analysis.HeaderCheckWorker.readLine(
>         at
>         at org.apache.rat.analysis.DocumentHeaderAnalyser.analyse(
>         at org.apache.rat.analysis.DefaultAnalyserFactory$DefaultAnalyser.analyse(
>         at org.apache.rat.document.impl.util.DocumentAnalyserMultiplexer.analyse(
>         at
>         at
>         at
>         at
>         at
>         at
>         at
>         at
> 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:
> 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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