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https://issues.apache.org/jira/browse/LUCENE-5578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13963032#comment-13963032
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Michael McCandless commented on LUCENE-5578:
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+1, looks great! Thanks Adrien.
> 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, LUCENE-5578.patch, LUCENE-5578.patch,
> 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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