[OAK-4345] Bulk update constructs malformed query

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4, 1.4.1, 1.4.2
• Fix Version/s: 1.4.6, 1.5.2, 1.6.0
• Component/s: core, mongomk
• Assignee: Marcel Reutegger
• Reporter: Marcel Reutegger
• Created: 04/May/16 12:44
• Updated: 21/Jul/16 12:48
• Resolved: 04/May/16 14:34

Description

MongoDocumentStore constructs a malformed query for bulk update of new documents. The query is:

{ "_id" : { "$not" : { "$exists" : "_modCount"}}}

while it actually should be:

{ "_id" : "<some-id>" , "_modCount" : { "$exists" : false}}

It doesn't seem to do any harm in a non-sharded deployment. The query does not mistakenly match documents.

However there is a problem when MongoDB is shareded and the calls are routed through mongos. The bulk update become very slow (more than a factor of 10). I assume mongos cannot figure out where to route the bulk update and resorts to executing the updates individually.

Issue Links

• relates to: OAK-3559 Bulk document updates in MongoDocumentStore