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https://issues.apache.org/jira/browse/LUCENE-6341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350350#comment-14350350
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Michael McCandless commented on LUCENE-6341:
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bq. ???? Reader open is doing this check.
Right, I just mean the usage output ("-fast: just verify file checksums,
omitting logical integrity checks") is selling this option short because we do
more than just verify file checksums. Maybe it could say something like "only
perform fast verification such as file checksums, segment ids are consistent,
etc."?
> 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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