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https://issues.apache.org/jira/browse/SOLR-6145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027063#comment-14027063
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ASF subversion and git services commented on SOLR-6145:
-------------------------------------------------------

Commit 1601776 from [~steve_rowe] in branch 'dev/branches/branch_4x'
[ https://svn.apache.org/r1601776 ]

SOLR-6145: Fix Schema API optimistic concurrency by moving it out of 
ManagedIndexSchema.add(Copy)Fields() into the consumers of those methods: 
CopyFieldCollectionResource, FieldCollectionResource, FieldResource, and 
AddSchemaFieldsUpdateProcessorFactory. (merged trunk r1601770 and r1601775)

> Concurrent Schema API field additions can result in endless loop
> ----------------------------------------------------------------
>
>                 Key: SOLR-6145
>                 URL: https://issues.apache.org/jira/browse/SOLR-6145
>             Project: Solr
>          Issue Type: Bug
>          Components: Schema and Analysis
>            Reporter: Steve Rowe
>            Assignee: Steve Rowe
>            Priority: Critical
>             Fix For: 4.9, 5.0
>
>         Attachments: SOLR-6145-tests.patch, SOLR-6145.patch, SOLR-6145.patch, 
> SOLR-6145.patch, SOLR-6145.patch, SOLR-6145v2.patch, 
> concurrent_updates_and_schema_api.patch
>
>
> The optimistic concurrency loop in {{ManagedIndexSchema.addFields()}} is the 
> likely culprit.



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