Add option to specify queue processing timeout

Summary: When we have many requests coming in at the same time, some of them end up timing out. This ends up causing reconnects which are not desireable. Adding ability to tune this param, but for now defaulting to 100 since thats the current default.

Reviewed By: shri-khare

Differential Revision: D61296727

fbshipit-source-id: ef63cc8f1838b3b977c7a86c47300d623bcc32da

fboss/fsdb/server/Server.cpp

@@ -56,6 +56,11 @@ DEFINE_bool(
     false,
     "Convert subscriber paths to id paths and serve only ids");
 
+DEFINE_int32(
+    fsdb_queue_timeout_ms,
+    100,
+    "Queue timeout for fsdb thrift server");
+
 namespace facebook::fboss::fsdb {
 
 static apache::thrift::SSLPolicy getThriftServerSSLPolicy() {
@@ -134,6 +139,8 @@ std::shared_ptr<apache::thrift::ThriftServer> createThriftServer(
   server->setQuickExitOnShutdownTimeout(true);
   server->setTosReflect(FLAGS_enable_tos_reflect);
   server->setSSLPolicy(getThriftServerSSLPolicy());
+  server->setQueueTimeout(
+      std::chrono::milliseconds(FLAGS_fsdb_queue_timeout_ms));
   if (FLAGS_enable_thrift_acceptor) {
     auto trustedSubnets =
         getTrustedSubnets(fsdbConfig->getThrift().get_trustedSubnets());