Headers larger than 4k cannot be retrieved
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Key: COUCHDB-1319
URL: https://issues.apache.org/jira/browse/COUCHDB-1319
Project: CouchDB
Issue Type: Bug
Affects Versions: 1.1
Reporter: Adam Kocoloski
Assignee: Adam Kocoloski
Fix For: 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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