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+/*
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package org.apache.hadoop.utils;
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+
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+import org.rocksdb.HistogramData;
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+import org.rocksdb.HistogramType;
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+import org.rocksdb.Statistics;
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+import org.rocksdb.TickerType;
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+
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+import javax.management.Attribute;
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+import javax.management.AttributeList;
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+import javax.management.AttributeNotFoundException;
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+import javax.management.DynamicMBean;
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+import javax.management.InvalidAttributeValueException;
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+import javax.management.MBeanAttributeInfo;
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+import javax.management.MBeanException;
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+import javax.management.MBeanInfo;
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+import javax.management.ReflectionException;
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+import java.lang.reflect.InvocationTargetException;
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+import java.lang.reflect.Method;
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+import java.util.ArrayList;
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+import java.util.Arrays;
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+import java.util.HashMap;
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+import java.util.HashSet;
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+import java.util.List;
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+import java.util.Set;
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+import java.util.stream.Stream;
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+
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+/**
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+ * Adapter JMX bean to publish all the Rocksdb metrics.
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+ */
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+public class RocksDBStoreMBean implements DynamicMBean {
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+
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+ private Statistics statistics;
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+
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+ private Set<String> histogramAttributes = new HashSet<>();
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+
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+ public RocksDBStoreMBean(Statistics statistics) {
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+ this.statistics = statistics;
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+ histogramAttributes.add("Average");
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+ histogramAttributes.add("Median");
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+ histogramAttributes.add("Percentile95");
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+ histogramAttributes.add("Percentile99");
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+ histogramAttributes.add("StandardDeviation");
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+ }
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+
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+ @Override
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+ public Object getAttribute(String attribute)
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+ throws AttributeNotFoundException, MBeanException, ReflectionException {
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+ for (String histogramAttribute : histogramAttributes) {
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+ if (attribute.endsWith("_" + histogramAttribute.toUpperCase())) {
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+ String keyName = attribute
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+ .substring(0, attribute.length() - histogramAttribute.length() -1);
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+ try {
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+ HistogramData histogram =
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+ statistics.getHistogramData(HistogramType.valueOf(keyName));
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+ try {
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+ Method method =
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+ HistogramData.class.getMethod("get" + histogramAttribute);
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+ return method.invoke(histogram);
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+ } catch (Exception e) {
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+ throw new ReflectionException(e,
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+ "Can't read attribute " + attribute);
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+ }
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+ } catch (IllegalArgumentException exception) {
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+ throw new AttributeNotFoundException(
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+ "No such attribute in RocksDB stats: " + attribute);
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+ }
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+ }
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+ }
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+ try {
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+ return statistics.getTickerCount(TickerType.valueOf(attribute));
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+ } catch (IllegalArgumentException ex) {
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+ throw new AttributeNotFoundException(
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+ "No such attribute in RocksDB stats: " + attribute);
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+ }
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+ }
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+
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+ @Override
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+ public void setAttribute(Attribute attribute)
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+ throws AttributeNotFoundException, InvalidAttributeValueException,
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+ MBeanException, ReflectionException {
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+
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+ }
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+
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+ @Override
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+ public AttributeList getAttributes(String[] attributes) {
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+ AttributeList result = new AttributeList();
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+ for (String attributeName : attributes) {
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+ try {
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+ Object value = getAttribute(attributeName);
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+ result.add(value);
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+ } catch (Exception e) {
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+ //TODO
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+ }
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+ }
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+ return result;
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+ }
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+
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+ @Override
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+ public AttributeList setAttributes(AttributeList attributes) {
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+ return null;
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+ }
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+
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+ @Override
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+ public Object invoke(String actionName, Object[] params, String[] signature)
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+ throws MBeanException, ReflectionException {
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+ return null;
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+ }
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+
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+ @Override
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+ public MBeanInfo getMBeanInfo() {
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+
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+ List<MBeanAttributeInfo> attributes = new ArrayList<>();
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+ for (TickerType tickerType : TickerType.values()) {
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+ attributes.add(new MBeanAttributeInfo(tickerType.name(), "long",
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+ "RocksDBStat: " + tickerType.name(), true, false, false));
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+ }
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+ for (HistogramType histogramType : HistogramType.values()) {
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+ for (String histogramAttribute : histogramAttributes) {
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+ attributes.add(new MBeanAttributeInfo(
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+ histogramType.name() + "_" + histogramAttribute.toUpperCase(),
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+ "long", "RocksDBStat: " + histogramType.name(), true, false,
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+ false));
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+ }
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+ }
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+
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+ return new MBeanInfo("", "RocksDBStat",
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+ attributes.toArray(new MBeanAttributeInfo[0]), null, null, null);
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+
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+ }
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+}
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Anu Engineer