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v3rpc: use MaxRecvMsgSize and MaxSendMsgSize to limit msg size #8437

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merged 1 commit into from
Aug 24, 2017
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v3rpc: use MaxRecvMsgSize and MaxSendMsgSize to limit msg size #8437

merged 1 commit into from
Aug 24, 2017

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fanminshi
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@fanminshi fanminshi commented Aug 22, 2017 •
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grpc 1.3 uses MaxMsgSize() to limit received message size. However, grpc 1.4 introduces a 4mb default limit on send message size. In etcd, server shouldn't be limiting size of message that it can be sent. Hence, set maximum size of send message using MaxSendMsgSize().

@gyuho gyuho added this to the v3.3.0 milestone Aug 22, 2017
xiang90
xiang90 reviewed Aug 22, 2017
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etcdserver/api/v3rpc/grpc.go Outdated
@@ -31,6 +31,7 @@ import (
const (
grpcOverheadBytes = 512 * 1024
maxStreams = math.MaxUint32
maxSendBytes = math.MaxUint32
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for sent size, maybe we also want to make it configurable eventually. then users can limit the size of outbound response. one client wont eat up all bandwidth through a single huge list/watch.

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Should I do that for this pr or wait until user asks for it?

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/cc @heyitsanthony opinion?

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unlimited until someone asks; abusive clients can chew through bandwidth even with a send limit

@fanminshi
v3rpc: limit recv size using MaxRecvMsgSize and send using MaxSendMsg…
d2ca782 
…Size

grpc 1.3 uses MaxMsgSize() to limit received message size. However, grpc 1.4 introduces a 4mb default limit on send message size. In etcd, server shouldn't be limit size of message that it can be sent. Hence, set maximum size of send message using MaxSendMsgSize().
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Is anything hitting this limit?

@xiang90
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xiang90 commented Aug 23, 2017

k8s is failing on large clusters. I assume anyone does unlimited initial cache catch-up will fail similarly.

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fanminshi commented Aug 23, 2017 •
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via https://jenkins-etcd-public.prod.coreos.systems/job/etcd-coverage/2094/consoleFull

--- FAIL: TestCtlV3Elect (1.16s)
	ctl_v3_elect_test.go:48: got "2017-08-22 22:48:24.408678 W | pkg/flags: unrecognized environment variable ETCDCTL_ARGS=../bin/etcdctl\xe7\xcd--endpoints=http://localhost:20000\xe7\xcd--dial-timeout=7s\xe7\xcdelect\xe7\xcda\xe7\xcdp1\r\n", expected "a" prefix
	ctl_v3_elect_test.go:60: should block
--- FAIL: TestCtlV3PutIgnoreLease (0.96s)
	ctl_v3_kv_test.go:127: putTestIgnoreLease: ctlV3Get error (unexpected output (got lines [], line count 3))
--- FAIL: TestCtlV3LeaseRevoke (0.84s)
	ctl_v3_lease_test.go:105: leaseTestRevoke: ctlV3Get error (unexpected output (got lines [], line count 3))
--- FAIL: TestCtlV3Lock (0.47s)
	ctl_v3_lock_test.go:48: got "2017-08-22 22:52:07.503502 W | pkg/flags: unrecognized environment variable ETCDCTL_ARGS=../bin/etcdctl\xe7\xcd--endpoints=http://localhost:20003\xe7\xcd--dial-timeout=7s\xe7\xcdlock\xe7\xcda\r\n", expected "a" prefix
	ctl_v3_lock_test.go:60: should block

I don't think it is related to this pr.

edit: lots failure from coverage run.

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xiang90 commented Aug 23, 2017

@fanminshi seems unrelated. lgtm.

@fanminshi fanminshi merged commit 4ec31f4 into etcd-io:master Aug 24, 2017
@gyuho gyuho mentioned this pull request Nov 16, 2017
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@heyitsanthony heyitsanthony heyitsanthony approved these changes

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