diff --git a/server/src/main/java/org/apache/druid/server/initialization/jetty/JettyServerModule.java b/server/src/main/java/org/apache/druid/server/initialization/jetty/JettyServerModule.java index 1e2bab200415..1299e11d60c0 100644 --- a/server/src/main/java/org/apache/druid/server/initialization/jetty/JettyServerModule.java +++ b/server/src/main/java/org/apache/druid/server/initialization/jetty/JettyServerModule.java @@ -34,6 +34,7 @@ import com.google.inject.multibindings.Multibinder; import com.sun.jersey.guice.JerseyServletModule; import com.sun.jersey.guice.spi.container.servlet.GuiceContainer; +import org.apache.commons.lang3.SystemUtils; import org.apache.druid.guice.Jerseys; import org.apache.druid.guice.JsonConfigProvider; import org.apache.druid.guice.LazySingleton; @@ -83,7 +84,10 @@ import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; +import java.io.BufferedReader; import java.io.IOException; +import java.nio.file.Files; +import java.nio.file.Paths; import java.security.KeyStore; import java.security.cert.CRL; import java.util.ArrayList; @@ -339,6 +343,7 @@ static Server makeAndInitializeServer( // workaround suggested in - // https://bugs.eclipse.org/bugs/show_bug.cgi?id=435322#c66 for jetty half open connection issues during failovers connector.setAcceptorPriorityDelta(-1); + connector.setAcceptQueueSize(getTCPAcceptQueueSize()); List monitoredConnFactories = new ArrayList<>(); for (ConnectionFactory cf : connector.getConnectionFactories()) { @@ -491,6 +496,23 @@ private static int getMaxJettyAcceptorsSelectorsNum(DruidNode druidNode) return numServerConnector * 8; } + private static int getTCPAcceptQueueSize() + { + if (SystemUtils.IS_OS_LINUX) { + try { + BufferedReader in = Files.newBufferedReader(Paths.get("/proc/sys/net/core/somaxconn")); + String acceptQueueSize = in.readLine(); + if (acceptQueueSize != null) { + return Integer.parseInt(acceptQueueSize); + } + } + catch (Exception e) { + log.warn("Unable to read /proc/sys/net/core/somaxconn, falling back to default value for TCP accept queue size"); + } + } + return 128; // Default value of net.core.somaxconn + } + @Provides @LazySingleton public JettyMonitor getJettyMonitor(DataSourceTaskIdHolder dataSourceTaskIdHolder)