[COUCHDB-644] Replicator creates URLs which are too long for the source node

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 0.9
• Fix Version/s: 1.0.3, 1.1
• Component/s: Replication

Environment

couchdb 0.9.0.r766883 CentOS x86_64

• Skill Level: Regular Contributors Level (Easy to Medium)
• Assignee: Unassigned
• Reporter: Enda Farrell
• Created: 09/Feb/10 15:57
• Updated: 27/Jan/11 15:29
• Resolved: 27/Jan/11 15:29

Description

We have an environment which can on ocassion create many open revs of a doc. The URLs that the replicator creates are longer than the http://issues.apache.org/jira/browse/COUCHDB-243 "mochiweb has an 8k limit", resulting in a general server crash.

To date the only work-around identified is to "export" the latest revisions of all docs in the database, destroy the database, re-create the database and reload the exported documents.

On one of our environments we have:
These docs have the trouble:

• http://db015.back.test.cwwtf.local:5984/labuk_braintestbritain/training_sessions_2255838
• http://db015.back.test.cwwtf.local:5984/madcache8888/b0019gpg
• http://db015.back.test.cwwtf.local:5984/madcache/bbc_one_scotland
• http://db015.back.test.cwwtf.local:5985/labuk_braintestbritain/training_sessions_1910457
• http://db015.back.test.cwwtf.local:5985/madcache8888/p0031rr3
• http://db015.back.test.cwwtf.local:5985/madcache/MAD_last_update

Their requests length - path + params (ie no host:port) are shown here (the key) with the number of times that that length was seen in our log files (the count):

key => count
8544 => 24
8557 => 11
8568 => 2392
8572 => 55
8591 => 893
8594 => 45
8636 => 27

Attached is a file with a sample of these too-long URLs.

Issue Links

• is duplicated by: COUCHDB-1044 Replication fails for documents with many open revisions
• is related to: COUCHDB-641 Should replication of recently purged documents keep trying? (0.9 release)
• relates to: COUCHDB-1044 Replication fails for documents with many open revisions
• relates to: COUCHDB-243 Tests for extra long docid's and attachment names.