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keyspace: Etcd watch can retry on Unknown gRPC errors #407

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merged 1 commit into from
Nov 19, 2024
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keyspace: Etcd watch can retry on Unknown gRPC errors #407

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17 changes: 13 additions & 4 deletions keyspace/key_space.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@ import (
"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/mirror"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)

// A KeySpace is a local mirror of a decoded portion of the Etcd key/value space,
Expand Down Expand Up @@ -179,13 +181,20 @@ func (ks *KeySpace) Watch(ctx context.Context, client clientv3.Watcher) error {
case resp, ok := <-watchCh:
if !ok {
return ctx.Err() // Watch contract implies the context is cancelled.
} else if err := resp.Err(); err == rpctypes.ErrNoLeader {
// ErrNoLeader indicates our watched Etcd is in a partitioned
// minority. Retry, attempting to find a member in the majority.
} else if err := resp.Err(); err != nil && !resp.Canceled {
log.WithFields(log.Fields{"err": err, "attempt": attempt}).
Warn("non-terminal watch error (will continue)")
} else if status, _ := status.FromError(err); err == rpctypes.ErrNoLeader || status.Code() == codes.Unknown {
// ErrNoLeader indicates our watched Etcd is in a partitioned minority.
// Unknown gRPC status can happen during Etcd shutdowns, such as in:
//
// rpc error: code = Unknown desc = malformed header: missing HTTP content-type
//
// In both cases we restart the watch.
watchCh = nil

log.WithFields(log.Fields{"err": err, "attempt": attempt}).
Warn("watch failed (will retry)")
Warn("watch channel failed (will restart)")

select {
case <-time.After(backoff(attempt)): // Pass.
Expand Down
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