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xds: enable ringhash and retry by default #4776

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merged 4 commits into from Sep 16, 2021
Merged

xds: enable ringhash and retry by default #4776

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845fc55
[affinity_env_var_on] xds: enable ringhash and retry by default
menghanl Sep 15, 2021
39abf29
[affinity_env_var_on] change how its done for security
menghanl Sep 15, 2021
7677f87
[affinity_env_var_on] test yml delete retry env
menghanl Sep 16, 2021
a1f9b37
[affinity_env_var_on] delete TestRetryDisabledByDefault
menghanl Sep 16, 2021
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22 changes: 5 additions & 17 deletions internal/xds/env/env.go
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Expand Up @@ -62,16 +62,16 @@ var (
// When both bootstrap FileName and FileContent are set, FileName is used.
BootstrapFileContent = os.Getenv(BootstrapFileContentEnv)
// RingHashSupport indicates whether ring hash support is enabled, which can
// be enabled by setting the environment variable
// "GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH" to "true".
RingHashSupport = strings.EqualFold(os.Getenv(ringHashSupportEnv), "true")
// be disabled by setting the environment variable
// "GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH" to "false".
RingHashSupport = !strings.EqualFold(os.Getenv(ringHashSupportEnv), "false")
// ClientSideSecuritySupport is used to control processing of security
// configuration on the client-side.
//
// Note that there is no env var protection for the server-side because we
// have a brand new API on the server-side and users explicitly need to use
// the new API to get security integration on the server.
ClientSideSecuritySupport = strings.EqualFold(os.Getenv(clientSideSecuritySupportEnv), "true")
ClientSideSecuritySupport = !strings.EqualFold(os.Getenv(clientSideSecuritySupportEnv), "false")
// AggregateAndDNSSupportEnv indicates whether processing of aggregated
// cluster and DNS cluster is enabled, which can be enabled by setting the
// environment variable
Expand All @@ -80,7 +80,7 @@ var (
AggregateAndDNSSupportEnv = strings.EqualFold(os.Getenv(aggregateAndDNSSupportEnv), "true")

// RetrySupport indicates whether xDS retry is enabled.
RetrySupport = strings.EqualFold(os.Getenv(retrySupportEnv), "true")
RetrySupport = !strings.EqualFold(os.Getenv(retrySupportEnv), "false")
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Was this intentional? It effectively enables Retry by default (not just with xDS). IE: We no longer need to set GRPC_GO_RETRY=on.

In envconfig.go:

Retry = strings.EqualFold(os.Getenv(retryStr), "on") || xdsenv.RetrySupport

envconfig.Retry will allways be true as long as GRPC_XDS_EXPERIMENTAL_ENABLE_RETRY is undefined.

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If this was intentional, then GRPC_GO_RETRY should probably be retired, as it does not have the same semantics anymore (and this is confusing).

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This was intentional, though it wasn't intentional that it overrides GRPC_GO_RETRY=off. Maybe we should fix that before the release (make GRPC_GO_RETRY default to on, and disable retry if either GRPC_GO_RETRY=off or GRPC_XDS_EXPERIMENTAL_ENABLE_RETRY=false).

Also this should be release-noted.

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#4899 fixes GRPC_GO_RETRY=off to disable retry as one would expect.

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OK, this is good for me that I can rely on retry being enabled by default from v1.41.0 onward.

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Note that we will remove this as a configurable setting entirely in the future (hopefully v1.42). It is & will always be controllable per-ClientConn via the WithDisableRetry dial option. Aaand I'll send a PR to fix the docstring on that method next.


// C2PResolverSupport indicates whether support for C2P resolver is enabled.
// This can be enabled by setting the environment variable
Expand All @@ -89,15 +89,3 @@ var (
// C2PResolverTestOnlyTrafficDirectorURI is the TD URI for testing.
C2PResolverTestOnlyTrafficDirectorURI = os.Getenv(c2pResolverTestOnlyTrafficDirectorURIEnv)
)

func init() {
// Set the env var used to control processing of security configuration on
// the client-side to true by default.
// TODO(easwars): Remove this env var completely in 1.42.x release.
//
// If the env var is set explicitly, honor it.
ClientSideSecuritySupport = true
if val, ok := os.LookupEnv(clientSideSecuritySupportEnv); ok {
ClientSideSecuritySupport = strings.EqualFold(val, "true")
}
}