blob: 4d842ca5f47527d310c860cf7c01b67829fbc0c2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "prepare_restart_flush_strategy.h"
#include <vespa/vespalib/util/arrayref.h>
namespace proton {
namespace flushengine { class TlsStats; }
class FlushTargetCandidate;
/**
* A set of flush targets that are candidates to be flushed.
*
* The total cost of using this set of candidates is:
* - the cost of replaying the TLS (after these are flushed) +
* - the cost of flushing these to disk
*/
class FlushTargetCandidates
{
public:
struct TlsReplayCost {
double bytesCost;
double operationsCost;
TlsReplayCost(double bytesCost_, double operationsCost_)
: bytesCost(bytesCost_),
operationsCost(operationsCost_)
{}
double totalCost() const { return bytesCost + operationsCost; }
};
private:
vespalib::ConstArrayRef<FlushTargetCandidate> _candidates; // NOTE: ownership is handled outside
size_t _num_candidates;
TlsReplayCost _tlsReplayCost;
double _flushTargetsWriteCost;
using Config = PrepareRestartFlushStrategy::Config;
public:
using UP = std::unique_ptr<FlushTargetCandidates>;
FlushTargetCandidates(vespalib::ConstArrayRef<FlushTargetCandidate> candidates,
size_t num_candidates,
const flushengine::TlsStats &tlsStats,
const Config &cfg);
TlsReplayCost getTlsReplayCost() const { return _tlsReplayCost; }
double getFlushTargetsWriteCost() const { return _flushTargetsWriteCost; }
double getTotalCost() const { return getTlsReplayCost().totalCost() + getFlushTargetsWriteCost(); }
FlushContext::List getCandidates() const;
};
} // namespace proton
|
