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Date: Thu, 10 May 2012 04:27:01 +0000 (UTC)
From: "Eric Yang (JIRA)" <jira@apache.org>
To: chukwa-dev@incubator.apache.org
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Subject: [jira] [Updated] (CHUKWA-641) PatternSyntaxException Crash from
 Unvalidated Regular Expression Usage
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     [ https://issues.apache.org/jira/browse/CHUKWA-641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Yang updated CHUKWA-641:
-----------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

+1 Thanks Eric, I just committed this.
                
> PatternSyntaxException Crash from Unvalidated Regular Expression Usage
> ----------------------------------------------------------------------
>
>                 Key: CHUKWA-641
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-641
>             Project: Chukwa
>          Issue Type: Bug
>    Affects Versions: 0.5.0
>            Reporter: Eric Spishak
>            Assignee: Eric Spishak
>         Attachments: CHUKWA-641.patch
>
>
> Chukwa sometimes crashes with an unhelpful stack trace.  In particular, a PatternSyntaxException is thrown when an invalid regular expression is passed to the dumpChunk command. This exception isn't useful to users to diagnose the error. I think it would be better to report a detailed error message. The attached patch makes this change.
> Steps to reproduce:
> # Run 'bin/chukwa dumpChunk "tags.=(" file'
> # dumpChunk command fails to start
> # See exception:
> {code}
> Exception in thread "main" java.util.regex.PatternSyntaxException:
> Unclosed group near index 1
> (
>  ^
>        at java.util.regex.Pattern.error(Pattern.java:1713)
>        at java.util.regex.Pattern.accept(Pattern.java:1571)
>        at java.util.regex.Pattern.group0(Pattern.java:2533)
>        at java.util.regex.Pattern.sequence(Pattern.java:1806)
>        at java.util.regex.Pattern.expr(Pattern.java:1752)
>        at java.util.regex.Pattern.compile(Pattern.java:1460)
>        at java.util.regex.Pattern.<init>(Pattern.java:1133)
>        at java.util.regex.Pattern.compile(Pattern.java:847)
>        at org.apache.hadoop.chukwa.util.Filter.<init>(Filter.java:94)
>        at org.apache.hadoop.chukwa.util.DumpChunks.dump(DumpChunks.java:88)
>        at org.apache.hadoop.chukwa.util.DumpChunks.main(DumpChunks.java:53)
> {code}
> After applying the supplied patch the output is:
> {code}
> Error parsing "tags" regular expression: Unclosed group near index 1
> (
>  ^
> {code}

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