HADOOP-3957. Change MutableQuantiles to use a shared thread for rolling over metrics. Contributed by Andrew Wang.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1390210 13f79535-47bb-0310-9956-ffa450edef68
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@ -244,6 +244,9 @@ Trunk (Unreleased)
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required context item is not configured
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(Brahma Reddy Battula via harsh)
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HADOOP-3957. Change MutableQuantiles to use a shared thread for rolling
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over metrics. (Andrew Wang via todd)
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OPTIMIZATIONS
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HADOOP-7761. Improve the performance of raw comparisons. (todd)
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@ -35,6 +35,7 @@ import org.apache.hadoop.metrics2.util.Quantile;
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import org.apache.hadoop.metrics2.util.SampleQuantiles;
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import com.google.common.annotations.VisibleForTesting;
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import com.google.common.util.concurrent.ThreadFactoryBuilder;
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/**
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* Watches a stream of long values, maintaining online estimates of specific
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@ -60,8 +61,9 @@ public class MutableQuantiles extends MutableMetric {
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@VisibleForTesting
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protected Map<Quantile, Long> previousSnapshot = null;
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private final ScheduledExecutorService scheduler = Executors
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.newScheduledThreadPool(1);
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private static final ScheduledExecutorService scheduler = Executors
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.newScheduledThreadPool(1, new ThreadFactoryBuilder().setDaemon(true)
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.setNameFormat("MutableQuantiles-%d").build());
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/**
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* Instantiates a new {@link MutableQuantiles} for a metric that rolls itself
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