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https://issues.apache.org/jira/browse/COUCHDB-616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Joseph Davis updated COUCHDB-616:
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Skill Level: Regular Contributors Level (Easy to Medium)
> 0.9->0.10 upgrade rebuilds views rather than just updating headers
> ------------------------------------------------------------------
>
> Key: COUCHDB-616
> URL: https://issues.apache.org/jira/browse/COUCHDB-616
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Affects Versions: 0.10.1
> Environment: Linux melkjug-xen 2.6.30.1-pv #1 SMP Thu Jul 9 08:12:56
> EDT 2009 x86_64 Intel(R) Xeon(R) CPU E5430 @ 2.66GHz GenuineIntel GNU/Linux
> Erlang (BEAM) emulator version 5.6.5 [source] [64-bit] [smp:2]
> [async-threads:0] [hipe]
> Reporter: Joshua Bronson
>
> It looks like there is code that is supposed to upgrade the headers of 0.9
> views to 0.10 style when a 0.10 couch reads a 0.9 view to avoid having to
> rebuild them (see
> http://github.com/halorgium/couchdb/blob/v0.10.1/src/couchdb/couch_view_group.erl#L379).
> However, they are indeed getting rebuilt.
> I have a test environment set up where I can trigger this behavior. I've
> added the debug output at http://paste.pocoo.org/show/163023/ and here is
> what's getting printed:
> before upgrade_old_header
> after upgrade_old_header
> Pos: 0
> Error: {'EXIT',{{badmatch,eof},
> [{couch_file,load_header,2},
> {couch_file,find_header,2},
> {couch_file,handle_call,3},
> {gen_server,handle_msg,5},
> {proc_lib,init_p_do_apply,3}]}}
> read_header: no_valid_header
> calling reset_file
> truncating
> For some reason the file:position(Fd, eof) call is return 0, indicating a
> 0-length file, but the view file in question is 188M.
> I spent a while debugging this with Jan in #couchdb today but we couldn't
> find the fix.
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