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https://issues.apache.org/jira/browse/LUCENE-7659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15838861#comment-15838861
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Adrien Grand commented on LUCENE-7659:
--------------------------------------
I think this change is not thread-safe? It currently returns a view
({{Map.keySet()}}) of the field numbers map which may be written to at any time
by {{IndexWriter}}, I think it should rather take a snapshot under the lock?
Ie. something like this:
{code}
+ synchronized Set<String> getFieldNames() {
+ return Collections.unmodifiableSet(new HashSet<>(nameToNumber.keySet()));
+ }
{code}
> IndexWriter should expose field names
> -------------------------------------
>
> Key: LUCENE-7659
> URL: https://issues.apache.org/jira/browse/LUCENE-7659
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Ishan Chattopadhyaya
> Assignee: Ishan Chattopadhyaya
> Attachments: LUCENE-7659.patch, LUCENE-7659.patch, LUCENE-7659.patch
>
>
> While working on SOLR-5944, I needed a way to know whether applying an update
> to a DV is possible (i.e. the DV exists or not), while deciding upon whether
> or not to apply the update as an in-place update or a regular full document
> update. This information is present at the IndexWriter in a FieldInfos
> instance, and can be exposed.
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