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Merge pull request #12985 from ptabor/20210517-fix-not-a-learner-retries

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Fix not retryable error codes from: Unavailable -> FailedPrecondition
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Piotr Tabor 2021-05-19 08:05:22 +02:00 committed by GitHub
commit 159d1916fe
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 19 additions and 7 deletions
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6
api/v3rpc/rpctypes/error.go
View File

@ -68,19 +68,19 @@ var (
ErrGRPCNoLeader = status.New(codes.Unavailable, "etcdserver: no leader").Err()
ErrGRPCNotLeader = status.New(codes.FailedPrecondition, "etcdserver: not leader").Err()
ErrGRPCLeaderChanged = status.New(codes.Unavailable, "etcdserver: leader changed").Err()
ErrGRPCNotCapable = status.New(codes.Unavailable, "etcdserver: not capable").Err()
ErrGRPCNotCapable = status.New(codes.FailedPrecondition, "etcdserver: not capable").Err()
ErrGRPCStopped = status.New(codes.Unavailable, "etcdserver: server stopped").Err()
ErrGRPCTimeout = status.New(codes.Unavailable, "etcdserver: request timed out").Err()
ErrGRPCTimeoutDueToLeaderFail = status.New(codes.Unavailable, "etcdserver: request timed out, possibly due to previous leader failure").Err()
ErrGRPCTimeoutDueToConnectionLost = status.New(codes.Unavailable, "etcdserver: request timed out, possibly due to connection lost").Err()
ErrGRPCUnhealthy = status.New(codes.Unavailable, "etcdserver: unhealthy cluster").Err()
ErrGRPCCorrupt = status.New(codes.DataLoss, "etcdserver: corrupt cluster").Err()
ErrGPRCNotSupportedForLearner = status.New(codes.Unavailable, "etcdserver: rpc not supported for learner").Err()
ErrGPRCNotSupportedForLearner = status.New(codes.FailedPrecondition, "etcdserver: rpc not supported for learner").Err()
ErrGRPCBadLeaderTransferee = status.New(codes.FailedPrecondition, "etcdserver: bad leader transferee").Err()
ErrGRPCClusterVersionUnavailable = status.New(codes.Unavailable, "etcdserver: cluster version not found during downgrade").Err()
ErrGRPCWrongDowngradeVersionFormat = status.New(codes.InvalidArgument, "etcdserver: wrong downgrade target version format").Err()
ErrGRPCInvalidDowngradeTargetVersion = status.New(codes.InvalidArgument, "etcdserver: invalid downgrade target version").Err()
ErrGRPCClusterVersionUnavailable = status.New(codes.FailedPrecondition, "etcdserver: cluster version not found during downgrade").Err()
ErrGRPCDowngradeInProcess = status.New(codes.FailedPrecondition, "etcdserver: cluster has a downgrade job in progress").Err()
ErrGRPCNoInflightDowngrade = status.New(codes.FailedPrecondition, "etcdserver: no inflight downgrade job").Err()

20
client/v3/retry_interceptor.go
View File

@ -19,6 +19,7 @@ package clientv3
import (
"context"
"errors"
"io"
"sync"
"time"
@ -91,7 +92,7 @@ func (c *Client) unaryClientInterceptor(optFuncs ...retryOption) grpc.UnaryClien
}
continue
}
if !isSafeRetry(c.lg, lastErr, callOpts) {
if !isSafeRetry(c, lastErr, callOpts) {
return lastErr
}
}
@ -257,7 +258,7 @@ func (s *serverStreamingRetryingStream) receiveMsgAndIndicateRetry(m interface{}
return true, err
}
return isSafeRetry(s.client.lg, err, s.callOpts), err
return isSafeRetry(s.client, err, s.callOpts), err
}
func (s *serverStreamingRetryingStream) reestablishStreamAndResendBuffer(callCtx context.Context) (grpc.ClientStream, error) {
@ -297,17 +298,28 @@ func waitRetryBackoff(ctx context.Context, attempt uint, callOpts *options) erro
}
// isSafeRetry returns "true", if request is safe for retry with the given error.
func isSafeRetry(lg *zap.Logger, err error, callOpts *options) bool {
func isSafeRetry(c *Client, err error, callOpts *options) bool {
if isContextError(err) {
return false
}
// Situation when learner refuses RPC it is supposed to not serve is from the server
// perspective not retryable.
// But for backward-compatibility reasons we need to support situation that
// customer provides mix of learners (not yet voters) and voters with an
// expectation to pick voter in the next attempt.
// TODO: Ideally client should be 'aware' which endpoint represents: leader/voter/learner with high probability.
if errors.Is(err, rpctypes.ErrGPRCNotSupportedForLearner) && len(c.Endpoints()) > 1 {
return true
}
switch callOpts.retryPolicy {
case repeatable:
return isSafeRetryImmutableRPC(err)
case nonRepeatable:
return isSafeRetryMutableRPC(err)
default:
lg.Warn("unrecognized retry policy", zap.String("retryPolicy", callOpts.retryPolicy.String()))
c.lg.Warn("unrecognized retry policy", zap.String("retryPolicy", callOpts.retryPolicy.String()))
return false
}
}