mdmarshmallow commented on code in PR #11796:
URL: https://github.com/apache/lucene/pull/11796#discussion_r982902771


##########
lucene/misc/src/java/org/apache/lucene/misc/store/ByteWritesTrackingDirectoryWrapper.java:
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@@ -0,0 +1,118 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.lucene.misc.store;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicLong;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.FilterDirectory;
+import org.apache.lucene.store.IOContext;
+import org.apache.lucene.store.IndexOutput;
+
+/** {@link FilterDirectory} that tracks write amplification factor */
+public final class ByteWritesTrackingDirectoryWrapper extends FilterDirectory {
+
+  private final AtomicLong flushedBytes = new AtomicLong();
+  private final AtomicLong mergedBytes = new AtomicLong();
+  private final AtomicLong realTimeFlushedBytes = new AtomicLong();

Review Comment:
   I don't see any issue with having a real time counter lagging by 1000 bytes, 
though maybe we can also provide that as an option that can be changed and have 
the default at 1000?



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