63 lines
2.0 KiB
Go
63 lines
2.0 KiB
Go
// Copyright 2023 PingCAP, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package tiflashcompute
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import (
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/pkg/sessionctx/vardef"
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)
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// DispatchPolicy means different policy to dispatching task to tiflash_compute nods.
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type DispatchPolicy int
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const (
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// DispatchPolicyRR means dispatching by RoundRobin.
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DispatchPolicyRR DispatchPolicy = iota
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// DispatchPolicyConsistentHash means dispatching by ConsistentHash.
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DispatchPolicyConsistentHash
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// DispatchPolicyInvalid is invalid policy.
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DispatchPolicyInvalid
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)
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// GetValidDispatchPolicy return all valid policy string.
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func GetValidDispatchPolicy() []string {
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return []string{vardef.DispatchPolicyConsistentHashStr, vardef.DispatchPolicyRRStr}
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}
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// GetDispatchPolicyByStr return corresponding policy.
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func GetDispatchPolicyByStr(str string) (DispatchPolicy, error) {
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switch str {
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case vardef.DispatchPolicyConsistentHashStr:
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return DispatchPolicyConsistentHash, nil
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case vardef.DispatchPolicyRRStr:
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return DispatchPolicyRR, nil
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default:
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return DispatchPolicyInvalid,
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errors.Errorf("unexpected tiflash_compute dispatch policy, expect %v, got %v", GetValidDispatchPolicy(), str)
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}
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}
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// GetDispatchPolicy return corresponding policy string.
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func GetDispatchPolicy(p DispatchPolicy) string {
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switch p {
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case DispatchPolicyConsistentHash:
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return vardef.DispatchPolicyConsistentHashStr
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case DispatchPolicyRR:
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return vardef.DispatchPolicyRRStr
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default:
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return vardef.DispatchPolicyInvalidStr
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}
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}
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