[GitHub] [lucene-solr] jpountz commented on a change in pull request #1917: LUCENE-9535: Make ByteBuffersDataOutput#ramBytesUsed run in constant-time.

[GitBox <gi...@apache.org>]

jpountz commented on a change in pull request #1917:
URL: https://github.com/apache/lucene-solr/pull/1917#discussion_r494317183



##########
File path: lucene/core/src/java/org/apache/lucene/store/ByteBuffersDataOutput.java
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@@ -400,8 +400,13 @@ public void writeSetOfStrings(Set<String> set) {
   public long ramBytesUsed() {
     // Return a rough estimation for allocated blocks. Note that we do not make
     // any special distinction for direct memory buffers.
-    return RamUsageEstimator.NUM_BYTES_OBJECT_REF * blocks.size() + 
-           blocks.stream().mapToLong(buf -> buf.capacity()).sum();
+    ByteBuffer first = blocks.peek();
+    if (first == null) {
+      return 0L;
+    } else {
+      // All blocks have the same capacity.

Review comment:
       Oops thanks for catching. I thought they did because we make the assumption that all buffers have the same length in toDataInput, which is different from capacity.




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