[jira] [Created] (OAK-4345) Bulk update constructs malformed query

["Marcel Reutegger (JIRA)" <ji...@apache.org>]

Marcel Reutegger created OAK-4345:
-------------------------------------

             Summary: Bulk update constructs malformed query
                 Key: OAK-4345
                 URL: https://issues.apache.org/jira/browse/OAK-4345
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: core, mongomk
    Affects Versions: 1.4.2, 1.4.1, 1.4
            Reporter: Marcel Reutegger
            Assignee: Marcel Reutegger
             Fix For: 1.6


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

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

while it actually should be:

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

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.



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