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From GitBox <...@apache.org>
Subject [GitHub] sjwiesman commented on a change in pull request #6814: [FLINK-10423][rocksdb][metrics] rocksdb native metrics monitor
Date Fri, 12 Oct 2018 17:09:12 GMT
sjwiesman commented on a change in pull request #6814: [FLINK-10423][rocksdb][metrics] rocksdb
native metrics monitor
URL: https://github.com/apache/flink/pull/6814#discussion_r224855111
 
 

 ##########
 File path: flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBNativeMetricMonitor.java
 ##########
 @@ -0,0 +1,154 @@
+/*
+ * 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.flink.contrib.streaming.state;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.core.fs.CloseableRegistry;
+import org.apache.flink.metrics.Gauge;
+import org.apache.flink.metrics.MetricGroup;
+import org.apache.flink.metrics.View;
+import org.apache.flink.util.FlinkRuntimeException;
+import org.apache.flink.util.IOUtils;
+import org.apache.flink.util.ResourceGuard;
+
+import org.rocksdb.ColumnFamilyHandle;
+import org.rocksdb.RocksDB;
+import org.rocksdb.RocksDBException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nonnull;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+/**
+ * A monitor which pull {{@link RocksDB}} native metrics
+ * and forwards them to Flink's metric group. All metrics are
+ * unsigned longs and are reported at the column family level.
+ */
+@Internal
+public class RocksDBNativeMetricMonitor implements Closeable {
+
+	private final CloseableRegistry registeredGauges;
+
+	private final RocksDB db;
+
+	private final ResourceGuard.Lease lease;
+
+	private final RocksDBNativeMetricOptions options;
+
+	private final MetricGroup metricGroup;
+
+	RocksDBNativeMetricMonitor(
+		@Nonnull RocksDB db,
+		@Nonnull ResourceGuard guard,
+		@Nonnull RocksDBNativeMetricOptions options,
+		@Nonnull MetricGroup metricGroup
+	) throws IOException {
+		this.db = db;
+		this.lease = guard.acquireResource();
+		this.options = options;
+		this.metricGroup = metricGroup;
+
+		this.registeredGauges = new CloseableRegistry();
+	}
+
+	/**
+	 * Register gauges to pull native metrics for the column family.
+	 * @param columnFamilyName group name for the new gauges
+	 * @param handle native handle to the column family
+	 */
+	void registerColumnFamily(String columnFamilyName, ColumnFamilyHandle handle) {
+		try {
+			MetricGroup group = metricGroup.addGroup(columnFamilyName);
+
+			for (String property : options.getProperties()) {
+				RocksDBNativeMetricView gauge = new RocksDBNativeMetricView(
+					property,
+					handle,
+					db
+				);
+
+				group.gauge(property, gauge);
+				registeredGauges.registerCloseable(gauge);
+			}
+		} catch (IOException e) {
+			throw new FlinkRuntimeException("Unable to register native metrics with RocksDB", e);
+		}
+	}
+
+	@Override
+	public void close() {
+		IOUtils.closeQuietly(registeredGauges);
+		IOUtils.closeQuietly(lease);
+	}
+
+	static class RocksDBNativeMetricView implements Gauge<String>, View, Closeable {
+		private static final Logger LOG = LoggerFactory.getLogger(RocksDBNativeMetricView.class);
+
+		private final String property;
+
+		private final ColumnFamilyHandle handle;
+
+		private final RocksDB db;
+
+		private volatile boolean open;
+
+		private long value;
+
+		private RocksDBNativeMetricView(
+			@Nonnull String property,
+			@Nonnull ColumnFamilyHandle handle,
+			@Nonnull RocksDB db
+		) {
+			this.property = property;
+			this.handle = handle;
+			this.db = db;
+			this.open = true;
+		}
+
+		@Override
+		public String getValue() {
+			return Long.toUnsignedString(value);
+		}
+
+		@Override
+		public void update() {
+			if (open) {
 
 Review comment:
   I create a `MetricGroup` per column family so keeping references to each of those would
be simple. If we just make `view` closeable, and each gauge keeps a lease for its entire lifetime,
then we can close all the metrics groups in dispose which will unregister all the gauges and
close the leases. Thoughts? 

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