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retry_failover.go
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/
retry_failover.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package pegasus
import (
"context"
"time"
"github.com/cenkalti/backoff/v4"
)
type tableRPCOp func() (confUpdated bool, result interface{}, retry bool, err error)
// retryFailOver retries the operation when it encounters replica fail-over, until context reaches deadline.
func retryFailOver(ctx context.Context, op tableRPCOp) (interface{}, error) {
bf := backoff.NewExponentialBackOff()
bf.InitialInterval = time.Second
bf.Multiplier = 2
for {
confUpdated, res, retry, err := op()
if confUpdated && !retry {
return res, err
}
backoffCh := time.After(bf.NextBackOff())
if confUpdated { // must fail
select {
case <-backoffCh:
continue
case <-ctx.Done():
err = ctx.Err()
break
}
}
return res, err
}
}