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https://issues.apache.org/jira/browse/COUCHDB-1319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139723#comment-13139723
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Paul Joseph Davis commented on COUCHDB-1319:
--------------------------------------------
It's a straightforward bug and has a test. I wouldn't have even bothered with a
ticket.
> Headers larger than 4k cannot be retrieved
> ------------------------------------------
>
> Key: COUCHDB-1319
> URL: https://issues.apache.org/jira/browse/COUCHDB-1319
> Project: CouchDB
> Issue Type: Bug
> Affects Versions: 1.1, 1.1.1
> Reporter: Adam Kocoloski
> Assignee: Adam Kocoloski
> Fix For: 1.2, 1.1.2
>
>
> Our headers start with a <<1>> and then four bytes indicating the length of
> the header and its checksum. When the header is larger than 4090 bytes it
> will be split across multiple blocks in the file and will need to be
> reassembled on read. The reassembly consists of stripping out <<0>> from the
> beginning of each subsequent block in the remove_block_prefixes/2 function.
> The bug here is that we tell remove_block_prefixes that we're starting 1 byte
> into the current block instead of 5, so it ends up removing one or more good
> bytes from the header and injecting one or more random <<0>>s.
> Headers larger than 4k are very rare and generally require a view group with
> a huge number of indexes or indexes with fairly large reductions, which
> explains why this bug has gone undetected until now.
> Patch forthcoming.
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