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Subject [42/50] [abbrv] hadoop git commit: HDFS-13493. Reduce the HttpServer2 thread count on DataNodes. Contributed by Erik Krogen.
Date Wed, 23 May 2018 22:56:34 GMT
HDFS-13493. Reduce the HttpServer2 thread count on DataNodes. Contributed by Erik Krogen.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/cddbbe5f
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/cddbbe5f
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/cddbbe5f

Branch: refs/heads/HDDS-4
Commit: cddbbe5f690e4617413f6e986adc6fa900629f03
Parents: e30938a
Author: Inigo Goiri <inigoiri@apache.org>
Authored: Wed May 23 12:12:08 2018 -0700
Committer: Inigo Goiri <inigoiri@apache.org>
Committed: Wed May 23 12:12:08 2018 -0700

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 .../hdfs/server/datanode/web/DatanodeHttpServer.java  | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/cddbbe5f/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/DatanodeHttpServer.java
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diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/DatanodeHttpServer.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/DatanodeHttpServer.java
index 0ce327a..4349c26 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/DatanodeHttpServer.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/DatanodeHttpServer.java
@@ -89,6 +89,13 @@ public class DatanodeHttpServer implements Closeable {
   private InetSocketAddress httpsAddress;
   static final Log LOG = LogFactory.getLog(DatanodeHttpServer.class);
 
+  // HttpServer threads are only used for the web UI and basic servlets, so
+  // set them to the minimum possible
+  private static final int HTTP_SELECTOR_THREADS = 1;
+  private static final int HTTP_ACCEPTOR_THREADS = 1;
+  private static final int HTTP_MAX_THREADS =
+      HTTP_SELECTOR_THREADS + HTTP_ACCEPTOR_THREADS + 1;
+
   public DatanodeHttpServer(final Configuration conf,
       final DataNode datanode,
       final ServerSocketChannel externalHttpChannel)
@@ -97,7 +104,12 @@ public class DatanodeHttpServer implements Closeable {
     this.conf = conf;
 
     Configuration confForInfoServer = new Configuration(conf);
-    confForInfoServer.setInt(HttpServer2.HTTP_MAX_THREADS_KEY, 10);
+    confForInfoServer.setInt(HttpServer2.HTTP_MAX_THREADS_KEY,
+        HTTP_MAX_THREADS);
+    confForInfoServer.setInt(HttpServer2.HTTP_SELECTOR_COUNT_KEY,
+        HTTP_SELECTOR_THREADS);
+    confForInfoServer.setInt(HttpServer2.HTTP_ACCEPTOR_COUNT_KEY,
+        HTTP_ACCEPTOR_THREADS);
     int proxyPort =
         confForInfoServer.getInt(DFS_DATANODE_HTTP_INTERNAL_PROXY_PORT, 0);
     HttpServer2.Builder builder = new HttpServer2.Builder()


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