[GitHub] [iceberg] RussellSpitzer commented on a change in pull request #4050: Add MetricsContext to enable metrics tracking with initial S3FileIO implementation

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RussellSpitzer commented on a change in pull request #4050:
URL: https://github.com/apache/iceberg/pull/4050#discussion_r805220454



##########
File path: core/src/main/java/org/apache/iceberg/hadoop/HadoopFileIOMetrics.java
##########
@@ -0,0 +1,81 @@
+/*
+ * 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.iceberg.hadoop;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Map;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.iceberg.exceptions.ValidationException;
+import org.apache.iceberg.io.FileIOMetrics;
+
+import static java.lang.String.format;
+
+/**
+ * FileIO Metrics implementation that delegates to Hadoop FileSystem
+ * statistics implementation using the provided scheme.
+ */
+public class HadoopFileIOMetrics implements FileIOMetrics {
+  public static final String SCHEME = "fileio.scheme";
+
+  private String scheme;
+  private transient FileSystem.Statistics statistics;
+
+  @Override
+  public void initialize(Map<String, String> properties) {
+    ValidationException.check(properties.containsKey(SCHEME),
+        "Scheme is required for Hadoop FileSystem metrics reporting");
+
+    // FileIO has no specific implementation class, but Hadoop will
+    // still track and report for the provided scheme.
+    this.scheme = properties.get(SCHEME);
+    this.statistics = FileSystem.getStatistics(scheme, null);
+  }
+
+  @Override
+  public <T> Counter<T> counter(String name, Class<T> type) {
+    switch (name) {
+      case READ_BYTES:
+        ValidationException.check(type != Long.class, "'%s' requires Long type", READ_BYTES);
+        return v -> statistics.incrementBytesRead((Long) v);
+      case READ_OPERATIONS:
+        ValidationException.check(type != Integer.class, "'%s' requires Integer type", READ_OPERATIONS);
+        return v -> statistics.incrementReadOps((Integer) v);
+      case WRITE_BYTES:

Review comment:
       For Spark you'll probably need to use the Custom Metric code that is now included for V2 Sources I think
   
   https://github.com/apache/spark/blob/master/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/PartitionReader.java#L56-L60
   
   and
   https://github.com/apache/spark/blob/master/sql/catalyst/src/main/java/org/apache/spark/sql/connector/write/DataWriter.java#L109-L115
   




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