comments

server/src/main/java/org/elasticsearch/common/io/stream/RecyclerBytesStreamOutput.java

@@ -177,6 +177,8 @@ public void writeWithSizePrefix(Writeable writeable) throws IOException {
  }
  }
 
+ // overridden with some code duplication the same way other write methods in this class are overridden to bypass StreamOutput's
+ // intermediary buffers
  @Override
  public void writeString(String str) throws IOException {
  final int currentPageOffset = this.currentPageOffset;
@@ -189,6 +191,7 @@ public void writeString(String str) throws IOException {
  BytesRef currentPage = pages.get(pageIndex).v();
  int off = currentPage.offset + currentPageOffset;
  byte[] buffer = currentPage.bytes;
+ // mostly duplicated from StreamOutput.writeString to to get more reliable compilation of this very hot loop
  int offset = off + putVInt(buffer, charCount, off);
  for (int i = 0; i < charCount; i++) {
  final int c = str.charAt(i);