Envoy Proxy with GRPC Server Streaming throwing UNAVAILABLE: upstream request timeout - grpc

Question

We are having GRPC client and GRPC server with service side streaming support.
rpc LotsOfReplies(HelloRequest) returns (stream HelloResponse);
GRPC server is running behind the Envoy proxy with GRPC configuration.
The problem is when we connect the GRPC client to Envoy Proxy -> Grpc Server we are getting the below exception. The code perfectly fine when we connect the GRPC client directly to GRPC server without Envoy Proxy.
io.grpc.StatusRuntimeException: UNAVAILABLE: upstream request timeout
at io.grpc.Status.asRuntimeException(Status.java:535)
at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onClose(ClientCalls.java:478)
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:553)
at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:68)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:739)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:718)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
The sample envoy.yaml configuration is as follows for reference. Any help on this front will be very helpful.
static_resources:
listeners:
- name: listener_0
address:
socket_address:
address: X.X.X.X
port_value: 443
ipv4Compat: true
filter_chains:
- filter_chain_match: {}
transport_socket:
name: envoy.transport_sockets.tls
typed_config:
"#type": type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.DownstreamTlsContext
common_tls_context:
tls_params:
cipher_suites:
- ECDHE-ECDSA-AES128-GCM-SHA256
- ECDHE-RSA-AES128-GCM-SHA256
- ECDHE-ECDSA-AES128-SHA
- ECDHE-RSA-AES128-SHA
- AES128-GCM-SHA256
- AES128-SHA
- ECDHE-ECDSA-AES256-GCM-SHA384
- ECDHE-RSA-AES256-GCM-SHA384
- ECDHE-ECDSA-AES256-SHA
- ECDHE-RSA-AES256-SHA
- AES256-GCM-SHA384
- AES256-SHA
ecdh_curves:
- P-256
tls_certificates:
- certificate_chain:
filename: "/home/.tomcat_cert.pem"
private_key:
filename: "/home/.tomcat_key.pem"
validation_context:
trust_chain_verification: ACCEPT_UNTRUSTED
alpn_protocols:
- h2
require_client_certificate: false
filters:
- name: envoy.filters.network.http_connection_manager
typed_config:
"#type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
stat_prefix: ingress_http
http_filters:
- name: envoy.filters.http.router
route_config:
name: local_route
virtual_hosts:
- name: local_service
domains: ["*"]
routes:
- match:
prefix: "/api.ApiService"
route:
cluster: grpc-server
idle_timeout: 0s
max_stream_duration:
grpc_timeout_header_max: 35s
- match:
prefix: "/site"
route:
cluster: site_router
clusters:
- name: site_router
type: static
# Comment out the following line to test on v6 networks
lb_policy: round_robin
connect_timeout: 25s
http2_protocol_options: {}
load_assignment:
cluster_name: site_router
endpoints:
- lb_endpoints:
- endpoint:
address:
socket_address:
address: 127.0.0.1
port_value: 7880
- name: grpc-server
type: static
# Comment out the following line to test on v6 networks
lb_policy: round_robin
connect_timeout: 25s
http2_protocol_options: {}
load_assignment:
cluster_name: grpc-server
endpoints:
- lb_endpoints:
- endpoint:
address:
socket_address:
address: 127.0.0.1
port_value: 7879
Please note that This works fine for unary gRPC calls as shown below.
rpc SayHello(HelloRequest) returns (HelloResponse);
But Not For Server Streaming
rpc LotsOfReplies(HelloRequest) returns (stream HelloResponse);

Answer 1

Providing timeout:0s inside envoy.yaml solve my problem.
static_resources:
listeners:
- name: listener_0
address:
socket_address:
address: X.X.X.X.
port_value: 443
ipv4Compat: true
filter_chains:
- filter_chain_match: {}
transport_socket:
name: envoy.transport_sockets.tls
typed_config:
"#type": type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.DownstreamTlsContext
common_tls_context:
tls_params:
cipher_suites:
- ECDHE-ECDSA-AES128-GCM-SHA256
- ECDHE-RSA-AES128-GCM-SHA256
- ECDHE-ECDSA-AES128-SHA
- ECDHE-RSA-AES128-SHA
- AES128-GCM-SHA256
- AES128-SHA
- ECDHE-ECDSA-AES256-GCM-SHA384
- ECDHE-RSA-AES256-GCM-SHA384
- ECDHE-ECDSA-AES256-SHA
- ECDHE-RSA-AES256-SHA
- AES256-GCM-SHA384
- AES256-SHA
ecdh_curves:
- P-256
tls_certificates:
- certificate_chain:
filename: "/home/.tomcat_cert.pem"
private_key:
filename: "/home/.tomcat_key.pem"
validation_context:
trust_chain_verification: ACCEPT_UNTRUSTED
alpn_protocols:
- h2
require_client_certificate: false
filters:
- name: envoy.filters.network.http_connection_manager
typed_config:
"#type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
stat_prefix: ingress_http
stream_idle_timeout: 0s
http_filters:
- name: envoy.filters.http.router
route_config:
name: local_route
virtual_hosts:
- name: local_service
domains: ["*"]
routes:
- match:
prefix: "/api.ApiService"
route:
cluster: grpc-server
timeout: 0s
- match:
prefix: "/policy"
route:
cluster: site_router
timeout: 30s
clusters:
- name: site_router
type: static
# Comment out the following line to test on v6 networks
lb_policy: round_robin
connect_timeout: 25s
http2_protocol_options: {}
load_assignment:
cluster_name: site_router
endpoints:
- lb_endpoints:
- endpoint:
address:
socket_address:
address: 127.0.0.1
port_value: 7880
- name: grpc-server
type: static
# Comment out the following line to test on v6 networks
lb_policy: round_robin
connect_timeout: 25s
http2_protocol_options: {}
load_assignment:
cluster_name: grpc-server
endpoints:
- lb_endpoints:
- endpoint:
address:
socket_address:
address: 127.0.0.1
port_value: 7879