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Forrest
aaee695927
* node hb and watcher scalability improvements * ensure that node has ample time to hb * fix degraded state * hbv2 test cov
60 lines
2.3 KiB
Go
60 lines
2.3 KiB
Go
/*
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Copyright 2019 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"time"
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"github.com/gravitational/teleport/api/utils/retryutils"
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)
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// HalfJitter is a global jitter instance used for one-off jitters.
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// Prefer instantiating a new jitter instance for operations that require
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// repeated calls, and use a dedicated sharded jitter instance for
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// any usecases that might scale with cluster size or request count.
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var HalfJitter = retryutils.NewHalfJitter()
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// SeventhJitter is a global jitter instance used for one-off jitters.
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// Prefer instantiating a new jitter instance for operations that require
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// repeated calls, and use a dedicated sharded jitter instance for
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// any usecases that might scale with cluster size or request count.
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var SeventhJitter = retryutils.NewSeventhJitter()
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// FullJitter is a global jitter instance used for one-off jitters.
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// Prefer instantiating a new jitter instance for operations that require
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// repeated calls, and use a dedicated sharded jitter instance for
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// any usecases that might scale with cluster size or request count.
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var FullJitter = retryutils.NewFullJitter()
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// NewDefaultLinear creates a linear retry with reasonable default parameters for
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// attempting to restart "critical but potentially load-inducing" operations, such
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// as watcher or control stream resume. Exact parameters are subject to change,
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// but this retry will always be configured for automatic reset.
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func NewDefaultLinear() *retryutils.Linear {
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retry, err := retryutils.NewLinear(retryutils.LinearConfig{
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First: FullJitter(time.Second * 10),
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Step: time.Second * 15,
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Max: time.Second * 90,
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Jitter: retryutils.NewHalfJitter(),
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AutoReset: 5,
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})
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if err != nil {
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panic("default linear retry misconfigured (this is a bug)")
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}
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return retry
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}
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