pawel-bugalski-dynatrace commented on a change in pull request #2429:
URL: https://github.com/apache/lucene-solr/pull/2429#discussion_r583526175
##########
File path: lucene/core/src/java/org/apache/lucene/util/BytesRefHash.java
##########
@@ -31,18 +31,21 @@
* to the id is encapsulated inside {@link BytesRefHash} and is guaranteed to
be increased for each
* added {@link BytesRef}.
*
+ * <p><strong>Note that this implementation is not synchronized.</strong> If
multiple threads access
+ * a {@link BytesRefHash} instance concurrently, and at least one of the
threads modifies it
+ * structurally, it <i>must</i> be synchronized externally. (A structural
modification is any
+ * operation on the map except operations explicitly listed in {@link
UnmodifiableBytesRefHash}
Review comment:
Fixed.
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