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Naveen Sampath04696f72022-06-13 15:19:14 +05301// Copyright 2017 The etcd Authors
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package clientv3
16
17import (
18 "math"
19 "time"
20
21 "google.golang.org/grpc"
22)
23
24var (
25 // client-side handling retrying of request failures where data was not written to the wire or
26 // where server indicates it did not process the data. gRPC default is default is "FailFast(true)"
27 // but for etcd we default to "FailFast(false)" to minimize client request error responses due to
28 // transient failures.
29 defaultFailFast = grpc.FailFast(false)
30
31 // client-side request send limit, gRPC default is math.MaxInt32
32 // Make sure that "client-side send limit < server-side default send/recv limit"
33 // Same value as "embed.DefaultMaxRequestBytes" plus gRPC overhead bytes
34 defaultMaxCallSendMsgSize = grpc.MaxCallSendMsgSize(2 * 1024 * 1024)
35
36 // client-side response receive limit, gRPC default is 4MB
37 // Make sure that "client-side receive limit >= server-side default send/recv limit"
38 // because range response can easily exceed request send limits
39 // Default to math.MaxInt32; writes exceeding server-side send limit fails anyway
40 defaultMaxCallRecvMsgSize = grpc.MaxCallRecvMsgSize(math.MaxInt32)
41
42 // client-side non-streaming retry limit, only applied to requests where server responds with
43 // a error code clearly indicating it was unable to process the request such as codes.Unavailable.
44 // If set to 0, retry is disabled.
45 defaultUnaryMaxRetries uint = 100
46
47 // client-side streaming retry limit, only applied to requests where server responds with
48 // a error code clearly indicating it was unable to process the request such as codes.Unavailable.
49 // If set to 0, retry is disabled.
50 defaultStreamMaxRetries = ^uint(0) // max uint
51
52 // client-side retry backoff wait between requests.
53 defaultBackoffWaitBetween = 25 * time.Millisecond
54
55 // client-side retry backoff default jitter fraction.
56 defaultBackoffJitterFraction = 0.10
57)
58
59// defaultCallOpts defines a list of default "gRPC.CallOption".
60// Some options are exposed to "clientv3.Config".
61// Defaults will be overridden by the settings in "clientv3.Config".
62var defaultCallOpts = []grpc.CallOption{defaultFailFast, defaultMaxCallSendMsgSize, defaultMaxCallRecvMsgSize}
63
64// MaxLeaseTTL is the maximum lease TTL value
65const MaxLeaseTTL = 9000000000