bharathv commented on a change in pull request #754: HBASE-22978 : Online slow 
response log
URL: https://github.com/apache/hbase/pull/754#discussion_r379693205
 
 

 ##########
 File path: 
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/slowlog/SlowLogRecorder.java
 ##########
 @@ -0,0 +1,144 @@
+/*
+ *
+ * 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.slowlog;
+
+import com.lmax.disruptor.BlockingWaitStrategy;
+import com.lmax.disruptor.RingBuffer;
+import com.lmax.disruptor.dsl.Disruptor;
+import com.lmax.disruptor.dsl.ProducerType;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.util.Threads;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.yetus.audience.InterfaceStability;
+
+import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
+
+import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos;
+import 
org.apache.hadoop.hbase.shaded.protobuf.generated.TooSlowLog.SlowLogPayload;
+
+/**
+ * Online SlowLog Provider Service that keeps slow logs in the ring buffer
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public class SlowLogRecorder {
+
+  private final Disruptor<RingBufferEnvelope> disruptor;
+  private final SlowLogEventHandler slowLogEventHandler;
+  private final int eventCount;
+  private final boolean isOnlineSlowLogProviderEnabled;
+
+  private static final String SLOW_LOG_RING_BUFFER_SIZE =
+    "hbase.regionserver.slowlog.ringbuffer.size";
+
+  /**
+   * Initialize disruptor with configurable ringbuffer size
+   */
+  public SlowLogRecorder(Configuration conf) {
+    isOnlineSlowLogProviderEnabled = 
conf.getBoolean(HConstants.SLOW_LOG_BUFFER_ENABLED_KEY,
+      HConstants.DEFAULT_ONLINE_LOG_PROVIDER_ENABLED);
+
+    this.eventCount = conf.getInt(SLOW_LOG_RING_BUFFER_SIZE,
 
 Review comment:
   All this can be short-circuted if isOnlineSlowLogProviderEnabled == false.

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