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https://issues.apache.org/jira/browse/LUCENE-5578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13960443#comment-13960443
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Uwe Schindler commented on LUCENE-5578:
---------------------------------------

I think in your patch you have to check the format version of the input, 
otherwise you might copy too less, if it is a pre-4.8 index? Or do we never 
copy the data if the version is not exactly the same in source and target?

> Stored fields might accumulate checksums on merges
> --------------------------------------------------
>
>                 Key: LUCENE-5578
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5578
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Blocker
>             Fix For: 4.8
>
>         Attachments: LUCENE-5578.patch
>
>
> The bulk merge operation of our stored fields format is optimized in order to 
> avoid decompressing data when not needed. In order to know the offset of the 
> end of the current block, it either consults the stored fields index, or uses 
> {{fieldsStream.length()}} for the last chunk.
> However, we just added checksums at the end of index files, so it might 
> currently copy the current checksum in addition to the last chunk, and then 
> write a new checksum.



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