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https://issues.apache.org/jira/browse/SOLR-15830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17530346#comment-17530346
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Bence Szabó commented on SOLR-15830:
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Thank you [~krisden] for the quick fix. Somehow I missed the unlock part, sorry
for introducing this bug.
> Concurrent core reloads mess up commits when using Schema API
> -------------------------------------------------------------
>
> Key: SOLR-15830
> URL: https://issues.apache.org/jira/browse/SOLR-15830
> Project: Solr
> Issue Type: Bug
> Reporter: Bence Szabó
> Assignee: Andras Salamon
> Priority: Major
> Fix For: 9.1
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> When using Schema API SchemaManager class triggers a core reload here:
> [https://github.com/apache/solr/blob/cfc953b6b906ef742bba57024d327fbde5d564c2/solr/core/src/java/org/apache/solr/schema/SchemaManager.java#L132]
> As I understand this was introduced in SOLR-9832 and is useful to avoid
> accidentally reloading to an older version of the config. The problem is that
> in the solr core a listener is implemented to initiate a reload whenever a
> config change happens in ZK, this can be found here:
> [https://github.com/apache/solr/blob/cfc953b6b906ef742bba57024d327fbde5d564c2/solr/core/src/java/org/apache/solr/core/SolrCore.java#L3140]
> When updating the schema using the Schema API both of these reloads get
> triggered and this can result a strange bug, where not all the indexed
> documents are visible if the indexing is started just after the schema API
> returned.
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