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MAPREDUCE-5596. Allow configuring the number of threads used to serve shuffle connections. Contributed by Sandy Ryza 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1536711 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jason Darrell Lowe 2013-10-29 13:41:50 +00:00
parent defa7af4d3
commit e0c99b80d4
3 changed files with 24 additions and 1 deletions
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3
hadoop-mapreduce-project/CHANGES.txt
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@ -212,6 +212,9 @@ Release 2.2.1 - UNRELEASED
MAPREDUCE-5457. Add a KeyOnlyTextOutputReader to enable streaming to write
out text files without separators (Sandy Ryza)
MAPREDUCE-5596. Allow configuring the number of threads used to serve
shuffle connections (Sandy Ryza via jlowe)
OPTIMIZATIONS
MAPREDUCE-4680. Job history cleaner should only check timestamps of files in

10
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
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@ -304,6 +304,16 @@
</description>
</property>
<property>
<name>mapreduce.shuffle.max.threads</name>
<value>0</value>
<description>Max allowed threads for serving shuffle connections. Set to zero
to indicate the default of 2 times the number of available
processors (as reported by Runtime.availableProcessors()). Netty is used to
serve requests, so a thread is not needed for each connection.
</description>
</property>
<property>
<name>mapreduce.reduce.markreset.buffer.percent</name>
<value>0.0</value>

12
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle/src/main/java/org/apache/hadoop/mapred/ShuffleHandler.java
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@ -163,6 +163,10 @@ public class ShuffleHandler extends AuxiliaryService {
public static final String MAX_SHUFFLE_CONNECTIONS = "mapreduce.shuffle.max.connections";
public static final int DEFAULT_MAX_SHUFFLE_CONNECTIONS = 0; // 0 implies no limit
public static final String MAX_SHUFFLE_THREADS = "mapreduce.shuffle.max.threads";
// 0 implies Netty default of 2 * number of available processors
public static final int DEFAULT_MAX_SHUFFLE_THREADS = 0;
@Metrics(about="Shuffle output metrics", context="mapred")
static class ShuffleMetrics implements ChannelFutureListener {
@ -282,6 +286,11 @@ public class ShuffleHandler extends AuxiliaryService {
maxShuffleConnections = conf.getInt(MAX_SHUFFLE_CONNECTIONS,
DEFAULT_MAX_SHUFFLE_CONNECTIONS);
int maxShuffleThreads = conf.getInt(MAX_SHUFFLE_THREADS,
DEFAULT_MAX_SHUFFLE_THREADS);
if (maxShuffleThreads == 0) {
maxShuffleThreads = 2 * Runtime.getRuntime().availableProcessors();
}
ThreadFactory bossFactory = new ThreadFactoryBuilder()
.setNameFormat("ShuffleHandler Netty Boss #%d")
@ -292,7 +301,8 @@ public class ShuffleHandler extends AuxiliaryService {
selector = new NioServerSocketChannelFactory(
Executors.newCachedThreadPool(bossFactory),
Executors.newCachedThreadPool(workerFactory));
Executors.newCachedThreadPool(workerFactory),
maxShuffleThreads);
super.serviceInit(new Configuration(conf));
}