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https://issues.apache.org/jira/browse/LUCENE-9080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17026877#comment-17026877
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Erick Erickson commented on LUCENE-9080:
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It's the python version.

Python 2.7.16 produces what I posted before, the version with the extra cruft.

I tried it again with Python 3.7.5 and the extra cruft doesn't happen.

I'll update my local machines to insure I don't get confused again, thanks for 
pursuing. I was nervous about this originally, but didn't get any feedback on 
it.

'course as you well know it'll be 20 minutes before the ant target is done and 
I can see if it uses the right version of Python ;(


> Upgrade ICU4j to 62.2 and make regenerate work
> ----------------------------------------------
>
>                 Key: LUCENE-9080
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9080
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Erick Erickson
>            Assignee: Dawid Weiss
>            Priority: Major
>             Fix For: master (9.0)
>
>         Attachments: after_regen.patch, before_regen.patch, status.res
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> The root cause is that RamUsageEstimator.NUM_BYTES_INT has been removed and 
> the python scripts still reference it in the generated scripts. That part's 
> easy to fix.
> Last time I looked, though, the regenerate produces some differences in the 
> generated files that should be looked at to insure they're benign.
> Not really sure whether this should be a Lucene or Solr JIRA. Putting it in 
> Lucene since one of the failed files is: 
> lucene/core/src/java/org/apache/lucene/util/packed/Packed8ThreeBlocks.java
> I do know that one of the Solr jflex-produced file has an unexplained 
> difference so it may bleed over.
> "ant regenerate" needs about 24G on my machine FWIW.



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