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From "Filipe Manana (Commented) (JIRA)" <>
Subject [jira] [Commented] (COUCHDB-1365) Fix merging of document with attachment stubs
Date Fri, 16 Dec 2011 15:46:31 GMT


Filipe Manana commented on COUCHDB-1365:

Paul, it makes the merging throw a missing_stubs error instead of crashing with a function_clause
like this:

{"error":"{worker_died,<0.4681.0>,\n {function_clause,\n [{couch_doc,merge_stubs,\n
[{doc,<<\"document\">>,\n {12,\n [<<173,196,77,158,203,221,181,67,212,246,74,43,219,237,94,\n
140>>,\n <<72,74,171,180,242,101,33,172,166,195,136,125,231,134,65,\n 37>>,\n
<<83,182,225,95,63,211,178,52,96,92,102,114,130,224,138,145>>,\n <<95,234,29,149,2,72,24,226,188,255,99,148,120,126,85,103>>,\n
<<87,169,231,120,244,95,82,97,203,2,50,37,173,50,61,2>>,\n <<215,75,114,100,77,137,213,77,75,174,41,30,112,205,156,95>>,\n
<<65,124,138,146,230,4,155,92,52,14,189,152,167,30,231,96>>,\n <<68,16,172,15,172,224,254,189,163,203,141,251,172,187,194,\n
27>>,\n <<34,8,58,215,190,139,123,102,40,55,20,84,179,249,85,8>>,\n <<29,39,81,231,191,249,211,32,50,145,38,97,78,100,102,188>>,\n
<<88,5,136,102,228,34,222,205,62,252,107,44,97,23,101,81>>,\n <<222,52,110,92,212,100,161,137,190,163,109,245,255,233,\n
85,71>>]},\n <<131,104,1,108,0,0,0,1,104,2,109,0,0,0,4,110,97,109,101,109,\n 0,0,0,6,99,98,109,97,50,50,106>>,\n
[{att,<<\"./\">>,<<\"text/plain\">>,41,21,\n <<47,253,88,99,174,109,103,33,178,178,139,137,178,159,\n
243,29>>,\n 2,stub,gzip}],\n false,[]},\n nil]},\n {couch_db,'-prep_and_validate_replicated_updates/5-fun-5-',4},\n
{lists,foldl,3},\n {couch_db,prep_and_validate_replicated_updates,5},\n {couch_db,update_docs,4},\n
{couch_db,update_doc,4},\n {couch_replicator_worker,flush_doc,2},\n {couch_replicator_worker,local_doc_handler,2}]}}"}

When the replicator catches a missing_stubs error, it retries replicating the document but
without incremental attachment replication (sends all attachments, just like in 1.1 and below).
> Fix merging of document with attachment stubs
> ---------------------------------------------
>                 Key: COUCHDB-1365
>                 URL:
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Database Core, Replication
>            Reporter: Filipe Manana
>            Priority: Blocker
>             Fix For: 1.2, 1.1.2
>         Attachments: 0001-Fix-merging-of-documents-with-attachment-stubs.patch,
> This issue was found by Marty Schoch and is reproducible the following attached script.
> The commit message in the patch explains the issue:
> "During replicated updates, merging of documents with
> attachment stubs will fail if, after merging the received
> document's revision tree with the current on disk revision
> tree, produces a revision tree which doesn't contain the revision
> that immediately precedes the received document's revision.
> This happens when the received document doesn't contain in its
> revision history any of the revisions in the revision tree
> of the currently on disk document. This is possible when the
> document had a number of updates higher than the value of revs
> limit defined for the source database."

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