Github user xcangCRM commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/315#discussion_r207053000
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/monitoring/GlobalMetricRegistriesAdapter.java
---
@@ -0,0 +1,167 @@
+/*
+ * 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.phoenix.monitoring;
+
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Map.Entry;
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.hbase.metrics.Counter;
+import org.apache.hadoop.hbase.metrics.Gauge;
+import org.apache.hadoop.hbase.metrics.Histogram;
+import org.apache.hadoop.hbase.metrics.Meter;
+import org.apache.hadoop.hbase.metrics.Metric;
+import org.apache.hadoop.hbase.metrics.MetricRegistry;
+import org.apache.hadoop.hbase.metrics.MetricRegistryInfo;
+import org.apache.hadoop.hbase.metrics.Timer;
+import org.apache.hadoop.metrics2.MetricsCollector;
+import org.apache.hadoop.metrics2.MetricsInfo;
+import org.apache.hadoop.metrics2.MetricsRecordBuilder;
+import org.apache.hadoop.metrics2.MetricsSource;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
+import org.apache.hadoop.metrics2.lib.Interns;
+import org.apache.hadoop.metrics2.lib.MutableHistogram;
+import org.apache.hadoop.metrics2.source.JvmMetrics;
+
+/**
+ * Contents mostly copied from GlobalMetricRegistriesAdapter class from
hbase-hadoop2-compat
+ * The adapter attaches HBase's MetricRegistry to Hadoop's
DefaultMetricsSystem
+ * Doesn't handle dynamic attach/detach of registries
+ */
+public class GlobalMetricRegistriesAdapter {
+
+private static final Log LOG =
LogFactory.getLog(GlobalMetricRegistriesAdapter.class);
+private static GlobalMetricRegistriesAdapter INSTANCE;
+
+private GlobalMetricRegistriesAdapter() {
+DefaultMetricsSystem.initialize("Phoenix");
+JvmMetrics.initSingleton("Phoenix", "");
+}
+
+public static GlobalMetricRegistriesAdapter getInstance() {
+if (INSTANCE == null) {
+INSTANCE = new GlobalMetricRegistriesAdapter();
+}
+return INSTANCE;
+}
+
+public void registerMetricRegistry(MetricRegistry registry) {
+if (registry == null) {
+LOG.warn("Registry cannot be registered with Hadoop Metrics 2
since it is null.");
+return;
+}
+
+HBaseMetrics2HadoopMetricsAdapter adapter = new
HBaseMetrics2HadoopMetricsAdapter(registry);
+registerToDefaultMetricsSystem(registry, adapter);
+}
+
+private void registerToDefaultMetricsSystem(MetricRegistry registry,
HBaseMetrics2HadoopMetricsAdapter adapter) {
+MetricRegistryInfo info = registry.getMetricRegistryInfo();
+LOG.info("Registering " + info.getMetricsJmxContext() + " " +
info.getMetricsDescription() + " into DefaultMetricsSystem");
+
DefaultMetricsSystem.instance().register(info.getMetricsJmxContext(),
info.getMetricsDescription(), adapter);
+}
+
+/**
+ * Class to convert HBase Metric Objects to Hadoop Metrics2 Metric
Objects
+ */
+private static class HBaseMetrics2HadoopMetricsAdapter implements
MetricsSource {
+private static final Log LOG =
LogFactory.getLog(HBaseMetrics2HadoopMetricsAdapter.class);
+private final MetricRegistry registry;
+private HBaseMetrics2HadoopMetricsAdapter(MetricRegistry registry)
{
+this.registry = registry;
+}
+
+public void snapshotAllMetrics(MetricRegistry metricRegistry,
MetricsCollector collector) {
+MetricRegistryInfo info =
metricRegistry.getMetricRegistryInfo();
+MetricsRecordBuilder buil
