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Posted to commits@hbase.apache.org by jd...@apache.org on 2012/06/21 23:26:57 UTC
svn commit: r1352699 - in /hbase/trunk/hbase-server/src:
main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java
test/java/org/apache/hadoop/hbase/client/TestConnectionUtils.java
Author: jdcryans
Date: Thu Jun 21 21:26:57 2012
New Revision: 1352699
URL: http://svn.apache.org/viewvc?rev=1352699&view=rev
Log:
HBASE-6207 Add jitter to client retry timer (Elliott Clark via JD)
Added:
hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestConnectionUtils.java
Modified:
hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java
Modified: hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java
URL: http://svn.apache.org/viewvc/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java?rev=1352699&r1=1352698&r2=1352699&view=diff
==============================================================================
--- hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java (original)
+++ hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java Thu Jun 21 21:26:57 2012
@@ -21,6 +21,7 @@ import org.apache.hadoop.classification.
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hbase.HConstants;
+import java.util.Random;
/**
* Utility used by client connections such as {@link HConnection} and
@@ -29,6 +30,8 @@ import org.apache.hadoop.hbase.HConstant
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class ConnectionUtils {
+
+ private static final Random RANDOM = new Random();
/**
* Calculate pause time.
* Built on {@link HConstants#RETRY_BACKOFF}.
@@ -41,6 +44,9 @@ public class ConnectionUtils {
if (ntries >= HConstants.RETRY_BACKOFF.length) {
ntries = HConstants.RETRY_BACKOFF.length - 1;
}
- return pause * HConstants.RETRY_BACKOFF[ntries];
+
+ long normalPause = pause * HConstants.RETRY_BACKOFF[ntries];
+ long jitter = (long)(normalPause * RANDOM.nextFloat() * 0.01f); // 1% possible jitter
+ return normalPause + jitter;
}
}
\ No newline at end of file
Added: hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestConnectionUtils.java
URL: http://svn.apache.org/viewvc/hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestConnectionUtils.java?rev=1352699&view=auto
==============================================================================
--- hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestConnectionUtils.java (added)
+++ hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestConnectionUtils.java Thu Jun 21 21:26:57 2012
@@ -0,0 +1,56 @@
+/**
+ * Copyright The Apache Software Foundation
+ *
+ * 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.client;
+
+import org.apache.hadoop.hbase.SmallTests;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import java.util.Set;
+import java.util.TreeSet;
+
+import static org.junit.Assert.assertTrue;
+
+@Category(SmallTests.class)
+public class TestConnectionUtils {
+
+ @Test
+ public void testRetryTimeJitter() {
+ long[] retries = new long[200];
+ long baseTime = 1000000; //Larger number than reality to help test randomness.
+ long maxTimeExpected = (long) (baseTime * 1.01f);
+ for (int i = 0; i < retries.length; i++) {
+ retries[i] = ConnectionUtils.getPauseTime(baseTime, 0);
+ }
+
+ Set<Long> retyTimeSet = new TreeSet<Long>();
+ for (long l : retries) {
+ /*make sure that there is some jitter but only 1%*/
+ assertTrue(l >= baseTime);
+ assertTrue(l <= maxTimeExpected);
+ // Add the long to the set
+ retyTimeSet.add(l);
+ }
+
+ //Make sure that most are unique. some overlap will happen
+ assertTrue(retyTimeSet.size() > (retries.length * 0.80));
+ }
+
+}