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https://issues.apache.org/jira/browse/COUCHDB-1570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485847#comment-13485847
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Randall Leeds commented on COUCHDB-1570:
----------------------------------------
I started investigating this. So far I see no way for checkpoint document to
have "null" as the value for "_revisions.ids". All attempts I've made to create
such a document via the http interface throws {doc_validation, "_revisions.ids
isn't a array."}.
I've dug around for a way that couch_db_updater might create such a document in
an edge case but cannot find one.
Jens, is there any information you can provide from the logs of these servers,
especially if you have logs for when the checkpoint failed the first time (if
you can find it)?
> Replicator writes corrupt remote checkpoint document on error; breaks
> replication
> ---------------------------------------------------------------------------------
>
> Key: COUCHDB-1570
> URL: https://issues.apache.org/jira/browse/COUCHDB-1570
> Project: CouchDB
> Issue Type: Bug
> Components: Replication
> Affects Versions: 1.2
> Environment: Mac OS X 10.8.2
> Reporter: Jens Alfke
> Assignee: Randall Leeds
> Priority: Blocker
> Fix For: 1.3
>
>
> If a 'push' replication receives error responses from the remote server while
> PUTting documents, it may write a corrupt checkpoint document to the remote
> server -- its _revisions._ids property is null. Any subsequent attempt to
> push to that server will cause the replicator to abort with an error when
> reading that replication document, since it requires _revisions.ids to be an
> array.
> The only workaround for this, short of deleting the remote database entirely,
> is to (a) identify the URL of the remote checkpoint document, and (b) delete
> it from the remote server. Otherwise you will never be able to push to that
> database again.
> Here's a failed replication attempt:
> $ curl -X POST --user snej :5984/_replicate --header
> Content-Type:application/json --data
> '{"source":"demo-shopping-attachments","target":"http://localhost:4984/demo-shopping-attachments","create_target":true}'
> {"error":"doc_validation","reason":"_revisions.ids isn't a array."}
> Here's the contents of the remote checkpoint document, once I identified its
> ID:
> $ curl :4984/demo-shopping-attachments/_local/5b913befe682d7bd1fbc24b1ce31cbc5
> {"_id":"_local/5b913befe682d7bd1fbc24b1ce31cbc5","_rev":"0-1","_revisions":{"ids":null,"start":0},"history":[{"doc_write_failures":2,"docs_read":2,"docs_written":0,"end_last_seq":207,"end_time":"Sun,
> 21 Oct 2012 19:40:04
> GMT","missing_checked":17,"missing_found":2,"recorded_seq":207,"session_id":"9a24dc37885b5b4e507ea90702b2fecf","start_last_seq":0,"start_time":"Sun,
> 21 Oct 2012 19:40:04
> GMT"}],"replication_id_version":2,"session_id":"9a24dc37885b5b4e507ea90702b2fecf","source_last_seq":207}
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