s1monw opened a new pull request #637: LUCENE-8754: Prevent ConcurrentModificationException in SegmentInfo URL: https://github.com/apache/lucene-solr/pull/637 In order to prevent ConcurrentModificationException this change makes an unmodifiable copy on write for all maps in SegmentInfo. MergePolicies can access these maps without synchronization and cause exceptions if it's modified in the merge thread.
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