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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "bucketgctimecalculator.h"
#include "ideal_service_layer_nodes_bundle.h"
#include <vespa/storage/distributor/maintenance/maintenancepriority.h>
#include <vespa/storage/distributor/operations/idealstate/idealstateoperation.h>
#include <vespa/storage/common/storagecomponent.h>
#include <vespa/storage/bucketdb/bucketdatabase.h>
#include <vespa/vespalib/stllike/hash_set.h>
#include <map>
#include <set>
namespace storage::lib {
class ClusterState;
}
namespace storage { class DistributorConfiguration; }
namespace storage::distributor {
class DistributorBucketSpace;
class DistributorNodeContext;
class DistributorStripeOperationContext;
class NodeMaintenanceStatsTracker;
/**
* This class is used by IdealStateManager to generate ideal state operations.
* Every time IdealStateManager wants to verify that a bucket is in its ideal
* state, it calls a list of StateCheckers' generateOperations() methods.
* This generates a list of operations to run.
*
* Each statechecker also keeps a queue of operations that have been previously
* generated. IdealStateManager adds to this queue, and also calls
* startOperations() to fetch operations to perform.
*
* The statechecker can also be used to generate metrics on what needs to be
* done to reach the ideal state - using the generateMetrics() method.
*/
class StateChecker {
public:
using SP = std::shared_ptr<StateChecker>;
/**
* Context object used when generating operations and metrics for a
* bucket.
*/
class Context
{
public:
Context(const DistributorNodeContext& node_ctx_in,
const DistributorStripeOperationContext& op_ctx_in,
const DistributorBucketSpace &distributorBucketSpace,
NodeMaintenanceStatsTracker&,
const document::Bucket& bucket_);
~Context();
Context(const Context&) = delete;
Context& operator=(const Context&) = delete;
// Per bucket
document::Bucket bucket;
document::BucketId siblingBucket;
BucketDatabase::Entry siblingEntry;
std::vector<BucketDatabase::Entry> entries;
// Common
const lib::ClusterState & systemState;
const lib::ClusterState * pending_cluster_state; // nullptr if no state is pending.
const DistributorConfiguration & distributorConfig;
const lib::Distribution & distribution;
BucketGcTimeCalculator gcTimeCalculator;
const IdealServiceLayerNodesBundle & idealStateBundle;
const DistributorNodeContext & node_ctx;
const DistributorStripeOperationContext & op_ctx;
const BucketDatabase & db;
NodeMaintenanceStatsTracker & stats;
const bool merges_inhibited_in_bucket_space;
const BucketDatabase::Entry& getSiblingEntry() const noexcept { return siblingEntry; }
IdealServiceLayerNodesBundle::ConstNodesRef idealState() const noexcept {
return idealStateBundle.available_nonretired_or_maintenance_nodes();
}
document::Bucket getBucket() const noexcept { return bucket; }
document::BucketId getBucketId() const noexcept { return bucket.getBucketId(); }
document::BucketSpace getBucketSpace() const noexcept { return bucket.getBucketSpace(); }
std::string toString() const;
void fillParentAndChildBuckets();
void fillSiblingBucket();
const BucketDatabase::Entry* getEntryForPrimaryBucket() const;
const BucketDatabase::Entry & entry() const noexcept { return _entry; }
void set_entry(const BucketDatabase::Entry & e) { _entry = e; }
private:
BucketDatabase::Entry _entry;
};
class ResultImpl
{
public:
virtual ~ResultImpl() = default;
virtual IdealStateOperation::UP createOperation() = 0;
virtual MaintenancePriority getPriority() const = 0;
virtual MaintenanceOperation::Type getType() const = 0;
};
class Result
{
std::unique_ptr<ResultImpl> _impl;
public:
IdealStateOperation::UP createOperation() {
return (_impl ? _impl->createOperation() : IdealStateOperation::UP());
}
MaintenancePriority getPriority() const {
return (_impl ? _impl->getPriority() : MaintenancePriority());
}
MaintenanceOperation::Type getType() const {
return (_impl ? _impl->getType() : MaintenanceOperation::OPERATION_COUNT);
}
static Result noMaintenanceNeeded();
static Result createStoredResult(IdealStateOperation::UP operation, MaintenancePriority::Priority priority);
private:
explicit Result(std::unique_ptr<ResultImpl> impl)
: _impl(std::move(impl))
{}
};
StateChecker() noexcept = default;
virtual ~StateChecker() = default;
/**
* Calculates if operations need to be scheduled to rectify any issues
* this state checker is checking for.
*
* @return Returns an operation to perform for the given bucket.
*/
virtual Result check(const Context &c) const = 0;
/**
* Returns the name of this state checker.
*/
virtual const char* getName() const noexcept = 0;
};
}
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