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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "resource_usage_tracker.h"
#include <vespa/searchcore/proton/attribute/i_attribute_usage_listener.h>
#include <vespa/searchcore/proton/server/disk_mem_usage_state.h>
#include <vespa/searchcore/proton/server/i_disk_mem_usage_notifier.h>
#include <vespa/persistence/spi/i_resource_usage_listener.h>
#include <vespa/vespalib/util/idestructorcallback.h>
#include <vespa/vespalib/stllike/hash_map.hpp>
#include <cassert>
using storage::spi::AttributeResourceUsage;
using storage::spi::ResourceUsage;
namespace proton {
class ResourceUsageTracker::ListenerGuard : public vespalib::IDestructorCallback
{
std::weak_ptr<ResourceUsageTracker> _tracker;
public:
ListenerGuard(std::shared_ptr<ResourceUsageTracker> tracker);
~ListenerGuard() override;
};
ResourceUsageTracker::ListenerGuard::ListenerGuard(std::shared_ptr<ResourceUsageTracker> tracker)
: _tracker(tracker)
{
}
ResourceUsageTracker::ListenerGuard::~ListenerGuard()
{
auto tracker = _tracker.lock();
if (tracker) {
tracker->remove_listener();
}
}
class ResourceUsageTracker::AttributeUsageListener : public IAttributeUsageListener
{
std::shared_ptr<ResourceUsageTracker> _tracker;
vespalib::string _document_type;
public:
AttributeUsageListener(std::shared_ptr<ResourceUsageTracker> tracker, const vespalib::string& document_type);
~AttributeUsageListener() override;
void notify_attribute_usage(const AttributeUsageStats &attribute_usage) override;
};
ResourceUsageTracker::AttributeUsageListener::AttributeUsageListener(std::shared_ptr<ResourceUsageTracker> tracker, const vespalib::string &document_type)
: IAttributeUsageListener(),
_tracker(std::move(tracker)),
_document_type(document_type)
{
}
ResourceUsageTracker::AttributeUsageListener::~AttributeUsageListener()
{
_tracker->remove_document_type(_document_type);
}
void
ResourceUsageTracker::AttributeUsageListener::notify_attribute_usage(const AttributeUsageStats &attribute_usage)
{
_tracker->notify_attribute_usage(_document_type, attribute_usage);
}
ResourceUsageTracker::ResourceUsageTracker(IDiskMemUsageNotifier& disk_mem_usage_notifier)
: std::enable_shared_from_this<ResourceUsageTracker>(),
IDiskMemUsageListener(),
_lock(),
_resource_usage(),
_listener(nullptr),
_disk_mem_usage_notifier(disk_mem_usage_notifier),
_attribute_usage(),
_attribute_address_space_max_document_type()
{
_disk_mem_usage_notifier.addDiskMemUsageListener(this);
}
ResourceUsageTracker::~ResourceUsageTracker()
{
_disk_mem_usage_notifier.removeDiskMemUsageListener(this);
}
storage::spi::ResourceUsage
ResourceUsageTracker::get_resource_usage() const
{
std::lock_guard guard(_lock);
return _resource_usage;
}
void
ResourceUsageTracker::notifyDiskMemUsage(DiskMemUsageState state)
{
std::lock_guard guard(_lock);
// The transient resource usage is subtracted from the total resource usage
// before it eventually is reported to the cluster controller (to decide whether to block client feed).
// This ensures that the transient resource usage is covered by the resource headroom on the content node,
// instead of leading to feed blocked due to natural fluctuations.
_resource_usage = ResourceUsage(state.non_transient_disk_usage(),
state.non_transient_memory_usage(),
_resource_usage.get_attribute_address_space_usage());
if (_listener != nullptr) {
_listener->update_resource_usage(_resource_usage);
}
}
std::unique_ptr<vespalib::IDestructorCallback>
ResourceUsageTracker::set_listener(storage::spi::IResourceUsageListener& listener)
{
std::lock_guard guard(_lock);
assert(_listener == nullptr);
_listener = &listener;
listener.update_resource_usage(_resource_usage);
return std::make_unique<ListenerGuard>(shared_from_this());
}
void
ResourceUsageTracker::remove_listener()
{
std::lock_guard guard(_lock);
_listener = nullptr;
}
void
ResourceUsageTracker::remove_document_type(const vespalib::string &document_type)
{
std::lock_guard guard(_lock);
_attribute_usage.erase(document_type);
if (scan_attribute_usage(true, guard) && _listener != nullptr) {
_listener->update_resource_usage(_resource_usage);
}
}
namespace {
bool same_usage(const AddressSpaceUsageStats &lhs, const AddressSpaceUsageStats &rhs) {
return ((lhs.getUsage().usage() == rhs.getUsage().usage()) &&
(lhs.get_component_name() == rhs.get_component_name()) &&
(lhs.getAttributeName() == rhs.getAttributeName()) &&
(lhs.getSubDbName() == rhs.getSubDbName()));
}
bool can_skip_scan(double max, double old_max, bool same_document_type) noexcept {
return (!same_document_type && (max <= old_max));
}
}
void
ResourceUsageTracker::notify_attribute_usage(const vespalib::string &document_type, const AttributeUsageStats &attribute_usage)
{
std::lock_guard guard(_lock);
auto& old_usage = _attribute_usage[document_type];
if (same_usage(old_usage.max_address_space_usage(), attribute_usage.max_address_space_usage())) {
return; // usage for document type has not changed
}
old_usage = attribute_usage;
double address_space_max = attribute_usage.max_address_space_usage().getUsage().usage();
double old_address_space_max = _resource_usage.get_attribute_address_space_usage().get_usage();
if (can_skip_scan(address_space_max, old_address_space_max,
document_type == _attribute_address_space_max_document_type)) {
return; // usage for document type is less than or equal to usage for other document types
}
if (scan_attribute_usage(false, guard) && _listener != nullptr) {
_listener->update_resource_usage(_resource_usage);
}
}
namespace {
class MaxAttributeUsage
{
const AddressSpaceUsageStats* _max;
const vespalib::string* _document_type;
double _max_usage;
vespalib::string get_name() const {
return *_document_type + "." + _max->getSubDbName() + "." + _max->getAttributeName() + "." + _max->get_component_name();
}
public:
MaxAttributeUsage()
: _max(nullptr),
_document_type(nullptr),
_max_usage(0.0)
{
}
void sample(const vespalib::string& document_type, const AddressSpaceUsageStats& usage) {
if (_max == nullptr || usage.getUsage().usage() > _max_usage) {
_max = &usage;
_document_type = &document_type;
_max_usage = usage.getUsage().usage();
}
}
AttributeResourceUsage get_max_resource_usage() {
if (_max != nullptr) {
return AttributeResourceUsage(_max_usage, get_name());
} else {
return AttributeResourceUsage();
}
}
const vespalib::string get_document_type() const { return _document_type != nullptr ? *_document_type : ""; }
};
}
bool
ResourceUsageTracker::scan_attribute_usage(bool force_changed, std::lock_guard<std::mutex>&)
{
MaxAttributeUsage address_space_max;
for (const auto& kv : _attribute_usage) {
address_space_max.sample(kv.first, kv.second.max_address_space_usage());
}
ResourceUsage new_resource_usage(_resource_usage.get_disk_usage(),
_resource_usage.get_memory_usage(),
address_space_max.get_max_resource_usage());
bool changed = (new_resource_usage != _resource_usage) ||
force_changed;
if (changed) {
_resource_usage = std::move(new_resource_usage);
_attribute_address_space_max_document_type = address_space_max.get_document_type();
}
return changed;
}
std::unique_ptr<IAttributeUsageListener>
ResourceUsageTracker::make_attribute_usage_listener(const vespalib::string &document_type)
{
return std::make_unique<AttributeUsageListener>(shared_from_this(), document_type);
}
};
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