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From t...@apache.org
Subject svn commit: r1390211 - in /hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common: CHANGES.txt src/main/java/org/apache/hadoop/metrics2/lib/MutableQuantiles.java
Date Tue, 25 Sep 2012 23:16:20 GMT
Author: todd
Date: Tue Sep 25 23:16:20 2012
New Revision: 1390211

URL: http://svn.apache.org/viewvc?rev=1390211&view=rev
Log:
HADOOP-3957. Change MutableQuantiles to use a shared thread for rolling over metrics. Contributed
by Andrew Wang.

Modified:
    hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt
    hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableQuantiles.java

Modified: hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt?rev=1390211&r1=1390210&r2=1390211&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt (original)
+++ hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt Tue Sep
25 23:16:20 2012
@@ -22,6 +22,9 @@ Release 2.0.3-alpha - Unreleased 
 
     HADOOP-8812. ExitUtil#terminate should print Exception#toString. (eli)
 
+    HADOOP-3957. Change MutableQuantiles to use a shared thread for rolling
+    over metrics. (Andrew Wang via todd)
+
   OPTIMIZATIONS
 
   BUG FIXES

Modified: hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableQuantiles.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableQuantiles.java?rev=1390211&r1=1390210&r2=1390211&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableQuantiles.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableQuantiles.java
Tue Sep 25 23:16:20 2012
@@ -35,6 +35,7 @@ import org.apache.hadoop.metrics2.util.Q
 import org.apache.hadoop.metrics2.util.SampleQuantiles;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 /**
  * Watches a stream of long values, maintaining online estimates of specific
@@ -60,8 +61,9 @@ public class MutableQuantiles extends Mu
   @VisibleForTesting
   protected Map<Quantile, Long> previousSnapshot = null;
 
-  private final ScheduledExecutorService scheduler = Executors
-      .newScheduledThreadPool(1);
+  private static final ScheduledExecutorService scheduler = Executors
+      .newScheduledThreadPool(1, new ThreadFactoryBuilder().setDaemon(true)
+          .setNameFormat("MutableQuantiles-%d").build());
 
   /**
    * Instantiates a new {@link MutableQuantiles} for a metric that rolls itself



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