Merge pull request #28078 from jasons42/configure-etcdv3-client-max-request-size

Expose etcd client MaxCallSendMsgSize config

internal/backend/remote-state/etcdv3/backend.go

@@ -15,6 +15,7 @@ const (
 	usernameEnvVarName = "ETCDV3_USERNAME"
 	passwordKey        = "password"
 	passwordEnvVarName = "ETCDV3_PASSWORD"
+	maxRequestBytesKey = "max_request_bytes"
 	prefixKey          = "prefix"
 	lockKey            = "lock"
 	cacertPathKey      = "cacert_path"
@@ -49,6 +50,13 @@ func New() backend.Backend {
 				DefaultFunc: schema.EnvDefaultFunc(passwordEnvVarName, ""),
 			},
 
+			maxRequestBytesKey: &schema.Schema{
+				Type:        schema.TypeInt,
+				Optional:    true,
+				Description: "The max request size to send to etcd.",
+				Default:     0,
+			},
+
 			prefixKey: &schema.Schema{
 				Type:        schema.TypeString,
 				Optional:    true,
@@ -128,6 +136,9 @@ func (b *Backend) rawClient() (*etcdv3.Client, error) {
 	if v, ok := b.data.GetOk(passwordKey); ok && v.(string) != "" {
 		config.Password = v.(string)
 	}
+	if v, ok := b.data.GetOk(maxRequestBytesKey); ok && v.(int) != 0 {
+		config.MaxCallSendMsgSize = v.(int)
+	}
 	if v, ok := b.data.GetOk(cacertPathKey); ok && v.(string) != "" {
 		tlsInfo.TrustedCAFile = v.(string)
 	}

website/docs/language/settings/backends/etcdv3.html.md

@@ -10,7 +10,7 @@ description: |-
 
 **Kind: Standard (with locking)**
 
-Stores the state in the [etcd](https://coreos.com/etcd/) KV store with a given prefix.
+Stores the state in the [etcd](https://etcd.io/) KV store with a given prefix.
 
 This backend supports [state locking](/docs/language/state/locking.html).
 
@@ -54,3 +54,4 @@ The following configuration options / environment variables are supported:
  * `cacert_path` - (Optional) The path to a PEM-encoded CA bundle with which to verify certificates of TLS-enabled etcd servers.
  * `cert_path` - (Optional) The path to a PEM-encoded certificate to provide to etcd for secure client identification.
  * `key_path` - (Optional) The path to a PEM-encoded key to provide to etcd for secure client identification.
+ * `max_request_bytes` - (Optional) The max request size to send to etcd. This can be increased to enable storage of larger state. You must set the corresponding server-side flag [--max-request-bytes](https://etcd.io/docs/current/dev-guide/limit/#request-size-limit) as well and the value should be less than the client setting. Defaults to `2097152` (2.0 MiB). **Please Note:** Increasing etcd's request size limit may negatively impact overall latency.