Add support for gRPC max connection age configuration (#3121)

* Add support for gRPC max connection age configuration

* Add separate gRPC connection age configurations for Inference and Management endpoints

* Fix configuration parsing and default value

* Link docs for gRPC max connection age configuration

* fix spellcheck

---------

Co-authored-by: Matthias Reso <13337103+mreso@users.noreply.github.com>

Author: namannandan

docs/configuration.md

@@ -93,7 +93,7 @@ inference_address=https://127.0.0.1:8443
 inference_address=https://172.16.1.10:8080
 ```
 
-### Configure TorchServe gRPC listening addresses and ports
+### Configure TorchServe gRPC listening addresses, ports and max connection age
 The inference gRPC API is listening on port 7070, and the management gRPC API is listening on port 7071 on localhost by default.
 
 To configure different addresses use following properties
@@ -106,7 +106,15 @@ To configure different ports use following properties
 * `grpc_inference_port`: Inference gRPC API binding port. Default: 7070
 * `grpc_management_port`: management gRPC API binding port. Default: 7071
 
-Here are a couple of examples:
+To configure [max connection age](https://grpc.github.io/grpc-java/javadoc/io/grpc/netty/NettyServerBuilder.html#maxConnectionAge(long,java.util.concurrent.TimeUnit)) (milliseconds)
+
+* `grpc_inference_max_connection_age_ms`: Inference gRPC max connection age. Default: Infinite
+* `grpc_management_max_connection_age_ms`: Management gRPC max connection age. Default: Infinite
+
+To configure [max connection age grace](https://grpc.github.io/grpc-java/javadoc/io/grpc/netty/NettyServerBuilder.html#maxConnectionAgeGrace(long,java.util.concurrent.TimeUnit)) (milliseconds)
+
+* `grpc_inference_max_connection_age_grace_ms`: Inference gRPC max connection age grace. Default: Infinite
+* `grpc_management_max_connection_age_grace_ms`: Management gRPC max connection age grace. Default: Infinite
 
 ### Enable SSL
 

frontend/server/src/main/java/org/pytorch/serve/ModelServer.java

@@ -27,6 +27,7 @@
 import java.util.ServiceLoader;
 import java.util.Set;
 import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.DefaultParser;
@@ -452,6 +453,12 @@ private Server startGRPCServer(ConnectorType connectorType) throws IOException {
                                 new InetSocketAddress(
                                         configManager.getGRPCAddress(connectorType),
                                         configManager.getGRPCPort(connectorType)))
+                        .maxConnectionAge(
+                                configManager.getGRPCMaxConnectionAge(connectorType),
+                                TimeUnit.MILLISECONDS)
+                        .maxConnectionAgeGrace(
+                                configManager.getGRPCMaxConnectionAgeGrace(connectorType),
+                                TimeUnit.MILLISECONDS)
                         .maxInboundMessageSize(configManager.getMaxRequestSize())
                         .addService(
                                 ServerInterceptors.intercept(

frontend/server/src/main/java/org/pytorch/serve/util/ConfigManager.java

@@ -105,6 +105,14 @@ public final class ConfigManager {
     private static final String TS_GRPC_MANAGEMENT_ADDRESS = "grpc_management_address";
     private static final String TS_GRPC_INFERENCE_PORT = "grpc_inference_port";
     private static final String TS_GRPC_MANAGEMENT_PORT = "grpc_management_port";
+    private static final String TS_GRPC_INFERENCE_MAX_CONNECTION_AGE_MS =
+            "grpc_inference_max_connection_age_ms";
+    private static final String TS_GRPC_MANAGEMENT_MAX_CONNECTION_AGE_MS =
+            "grpc_management_max_connection_age_ms";
+    private static final String TS_GRPC_INFERENCE_MAX_CONNECTION_AGE_GRACE_MS =
+            "grpc_inference_max_connection_age_grace_ms";
+    private static final String TS_GRPC_MANAGEMENT_MAX_CONNECTION_AGE_GRACE_MS =
+            "grpc_management_max_connection_age_grace_ms";
     private static final String TS_ENABLE_GRPC_SSL = "enable_grpc_ssl";
     private static final String TS_INITIAL_WORKER_PORT = "initial_worker_port";
     private static final String TS_INITIAL_DISTRIBUTION_PORT = "initial_distribution_port";
@@ -384,6 +392,30 @@ public int getGRPCPort(ConnectorType connectorType) throws IllegalArgumentExcept
         return Integer.parseInt(port);
     }
 
+    public long getGRPCMaxConnectionAge(ConnectorType connectorType)
+            throws IllegalArgumentException {
+        if (connectorType == ConnectorType.MANAGEMENT_CONNECTOR) {
+            return getLongProperty(TS_GRPC_MANAGEMENT_MAX_CONNECTION_AGE_MS, Long.MAX_VALUE);
+        } else if (connectorType == ConnectorType.INFERENCE_CONNECTOR) {
+            return getLongProperty(TS_GRPC_INFERENCE_MAX_CONNECTION_AGE_MS, Long.MAX_VALUE);
+        } else {
+            throw new IllegalArgumentException(
+                    "Connector type not supported by gRPC: " + connectorType);
+        }
+    }
+
+    public long getGRPCMaxConnectionAgeGrace(ConnectorType connectorType)
+            throws IllegalArgumentException {
+        if (connectorType == ConnectorType.MANAGEMENT_CONNECTOR) {
+            return getLongProperty(TS_GRPC_MANAGEMENT_MAX_CONNECTION_AGE_GRACE_MS, Long.MAX_VALUE);
+        } else if (connectorType == ConnectorType.INFERENCE_CONNECTOR) {
+            return getLongProperty(TS_GRPC_INFERENCE_MAX_CONNECTION_AGE_GRACE_MS, Long.MAX_VALUE);
+        } else {
+            throw new IllegalArgumentException(
+                    "Connector type not supported by gRPC: " + connectorType);
+        }
+    }
+
     public boolean isOpenInferenceProtocol() {
         String inferenceProtocol = System.getenv("TS_OPEN_INFERENCE_PROTOCOL");
         if (inferenceProtocol != null && inferenceProtocol != "") {
@@ -795,6 +827,14 @@ private int getIntProperty(String key, int def) {
         return Integer.parseInt(value);
     }
 
+    private long getLongProperty(String key, long def) {
+        String value = prop.getProperty(key);
+        if (value == null) {
+            return def;
+        }
+        return Long.parseLong(value);
+    }
+
     public int getDefaultResponseTimeout() {
         return Integer.parseInt(prop.getProperty(TS_DEFAULT_RESPONSE_TIMEOUT, "120"));
     }

ts_scripts/spellcheck_conf/wordlist.txt

@@ -1237,3 +1237,4 @@ SamplingParams
 lora
 vllm
 sql
+TimeUnit