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https://issues.apache.org/jira/browse/LUCENE-4332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13443471#comment-13443471
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Dawid Weiss commented on LUCENE-4332:
-------------------------------------

bq. toFacyDawidWeissSeedFormat

That's just a hex representation of eight bytes (unsigned long), nothing fancy.

bq. We should install a SecurityManager always and only allow files in 
build/test

I didn't cater for the presence of a security manager in the runner and it will 
probably break things in the runner that will be tough to debug. Just a fair 
warning. You will probably have to give the runner a policy of being able to do 
everything and it still may fail to run.

bq. also we should ask Dawid if each forked jvm can get its own sandbox'ed 
java.io.tmpdir in build/test:

They already do I think because tmpdir property is overridden with "." and cwd 
is set to J0/J1/J2/JN under the test dir.
                
> Integrate PiTest mutation coverage tool into build
> --------------------------------------------------
>
>                 Key: LUCENE-4332
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4332
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 4.1, 5.0
>            Reporter: Greg Bowyer
>            Assignee: Greg Bowyer
>              Labels: build
>         Attachments: 
> LUCENE-4332-Integrate-PiTest-mutation-coverage-tool-into-build.patch, 
> LUCENE-4332-Integrate-PiTest-mutation-coverage-tool-into-build.patch
>
>
> As discussed briefly on the mailing list, this patch is an attempt to 
> integrate the PiTest mutation coverage tool into the lucene build

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