[GitHub] [lucene-solr] jpountz commented on a change in pull request #637: LUCENE-8754: Prevent ConcurrentModificationException in SegmentInfo

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jpountz commented on a change in pull request #637: LUCENE-8754: Prevent ConcurrentModificationException in SegmentInfo
URL: https://github.com/apache/lucene-solr/pull/637#discussion_r272899879
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/index/SegmentInfo.java
 ##########
 @@ -111,12 +112,12 @@ public SegmentInfo(Directory dir, Version version, Version minVersion, String na
     this.maxDoc = maxDoc;
     this.isCompoundFile = isCompoundFile;
     this.codec = codec;
-    this.diagnostics = Objects.requireNonNull(diagnostics);
+    this.diagnostics = Collections.unmodifiableMap(new HashMap<>(Objects.requireNonNull(diagnostics)));
     this.id = id;
     if (id.length != StringHelper.ID_LENGTH) {
       throw new IllegalArgumentException("invalid id: " + Arrays.toString(id));
     }
-    this.attributes = Objects.requireNonNull(attributes);
+    this.attributes = Collections.unmodifiableMap(new HashMap<>(Objects.requireNonNull(attributes)));
 
 Review comment:
   Nit: now that we are copying the input attributes, we should change the few call sites that pass a `new HashMap<>()` as attributes to pass a `Collections.emptyMap()` instead?

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