[GitHub] [hbase] Reidddddd commented on a change in pull request #648: HBASE-22975 Backport HBASE-22975 to branch-1

[GitBox <gi...@apache.org>]

Reidddddd commented on a change in pull request #648: HBASE-22975 Backport HBASE-22975 to branch-1
URL: https://github.com/apache/hbase/pull/648#discussion_r326944019
 
 

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 File path: hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsTableQueryMeterImpl.java
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+/*
+ * 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.hadoop.hbase.regionserver;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+import org.apache.hadoop.hbase.metrics.Meter;
+import org.apache.hadoop.hbase.metrics.MetricRegistry;
+
+/**
+ * Implementation of {@link MetricsTableQueryMeter} to track query per second for each table in
+ * a RegionServer.
+ */
+@InterfaceAudience.Private
+public class MetricsTableQueryMeterImpl implements MetricsTableQueryMeter {
+  private final Map<TableName, TableMeters> metersByTable = new ConcurrentHashMap<>();
+  private final MetricRegistry metricRegistry;
+
+  private final static String TABLE_READ_QUERY_PER_SECOND = "tableReadQueryPerSecond";
+  private final static String TABLE_WRITE_QUERY_PER_SECOND = "tableWriteQueryPerSecond";
+
+  public MetricsTableQueryMeterImpl(MetricRegistry metricRegistry) {
+    this.metricRegistry = metricRegistry;
+  }
+
+  private static class TableMeters {
+    final Meter tableReadQueryMeter;
+    final Meter tableWriteQueryMeter;
+
+    TableMeters(MetricRegistry metricRegistry, TableName tableName) {
+      this.tableReadQueryMeter = metricRegistry.meter(qualifyMetricsName(tableName,
+        TABLE_READ_QUERY_PER_SECOND));
+      this.tableWriteQueryMeter =
+        metricRegistry.meter(qualifyMetricsName(tableName, TABLE_WRITE_QUERY_PER_SECOND));
+    }
+
+    public void updateTableReadQueryMeter(long count) {
+      tableReadQueryMeter.mark(count);
+    }
+
+    public void updateTableReadQueryMeter() {
+      tableReadQueryMeter.mark();
+    }
+
+    public void updateTableWriteQueryMeter(long count) {
+      tableWriteQueryMeter.mark(count);
+    }
+
+    public void updateTableWriteQueryMeter() {
+      tableWriteQueryMeter.mark();
+    }
+  }
+
+  private static String qualifyMetricsName(TableName tableName, String metric) {
+    StringBuilder sb = new StringBuilder();
+    sb.append("Namespace_").append(tableName.getNamespaceAsString());
+    sb.append("_table_").append(tableName.getQualifierAsString());
+    sb.append("_metric_").append(metric);
+    return sb.toString();
+  }
+
+  private TableMeters getOrCreateTableMeter(TableName tableName) {
+    TableMeters meters = metersByTable.get(tableName);
+    if (meters == null) {
+      meters = new TableMeters(metricRegistry, tableName);
+      metersByTable.put(tableName, meters);
+    }
+    return meters;
+  }
+
+  @Override
+  public void updateTableReadQueryMeter(TableName tableName, long count) {
+    getOrCreateTableMeter(tableName).updateTableReadQueryMeter(count);
+  }
+
+  @Override
+  public void updateTableReadQueryMeter(TableName tableName) {
+    getOrCreateTableMeter(tableName).updateTableReadQueryMeter();
+  }
+
+  @Override
+  public void updateTableWriteQueryMeter(TableName tableName, long count) {
+    getOrCreateTableMeter(tableName).updateTableWriteQueryMeter(count);
+  }
+
+  @Override
+  public void updateTableWriteQueryMeter(TableName tableName) {
+    getOrCreateTableMeter(tableName).updateTableWriteQueryMeter();
+  }
+}
 
 Review comment:
   nit, an empty line at the end of file.

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