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https://issues.apache.org/jira/browse/LUCENE-6341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350155#comment-14350155
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Michael McCandless commented on LUCENE-6341:
--------------------------------------------

This is awesome.

+1 for patch and 5.x.

Does -verbose work with -fast?  I think it should (we seem to do null checks 
for all the terms dict stats), maybe add a test?  It's a nice (fast0 way to see 
RAM usage for the index...

Does -exorcise and -fast work?

In the usage can you also confess that the identifiers are also "cross-checked"?

> add CheckIndex -fast option
> ---------------------------
>
>                 Key: LUCENE-6341
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6341
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>         Attachments: LUCENE-6341.patch
>
>
> CheckIndex is great for testing and when tracking down lucene bugs. 
> But in cases where users just want to verify their index files are OK, it is 
> very slow and expensive.
> I think we should add a -fast option, that only opens the reader and calls 
> checkIntegrity(). This means all files are the correct files (identifiers 
> match) and have the correct CRC32 checksums.
> For our 10M doc wikipedia index, this is the difference between a 2 second 
> check and a 2 minute check.



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