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https://issues.apache.org/jira/browse/OAK-4345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger resolved OAK-4345.
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Resolution: Fixed
Fix Version/s: 1.5.2
Applied patch to trunk: http://svn.apache.org/r1742291
> 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, 1.4.1, 1.4.2
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Labels: candidate_oak_1_4
> Fix For: 1.6, 1.5.2
>
> Attachments: OAK-4345.patch
>
>
> 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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