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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "read_for_write_visitor_operation.h"
#include "visitoroperation.h"
#include <vespa/storage/distributor/distributormessagesender.h>
#include <vespa/storage/distributor/pendingmessagetracker.h>
#include <vespa/storage/distributor/operationowner.h>
#include <vespa/storage/distributor/uuid_generator.h>
#include <cassert>
#include <vespa/log/log.h>
LOG_SETUP(".operations.external.read_for_write_visitor_operation");
namespace storage::distributor {
ReadForWriteVisitorOperationStarter::ReadForWriteVisitorOperationStarter(
std::shared_ptr<VisitorOperation> visitor_op,
OperationSequencer& operation_sequencer,
OperationOwner& stable_operation_owner,
PendingMessageTracker& message_tracker,
UuidGenerator& uuid_generator)
: _visitor_op(std::move(visitor_op)),
_operation_sequencer(operation_sequencer),
_stable_operation_owner(stable_operation_owner),
_message_tracker(message_tracker),
_uuid_generator(uuid_generator)
{
}
ReadForWriteVisitorOperationStarter::~ReadForWriteVisitorOperationStarter() = default;
void ReadForWriteVisitorOperationStarter::onClose(DistributorStripeMessageSender& sender) {
_visitor_op->onClose(sender);
}
void ReadForWriteVisitorOperationStarter::onStart(DistributorStripeMessageSender& sender) {
if (_visitor_op->verify_command_and_expand_buckets(sender)) {
assert(!_visitor_op->has_sent_reply());
auto maybe_bucket = _visitor_op->first_bucket_to_visit();
if (!maybe_bucket) {
LOG(debug, "No buckets found to visit, tagging visitor complete");
// No buckets to be found, start op to trigger immediate reply.
_visitor_op->start(sender, _startTime);
assert(_visitor_op->has_sent_reply());
return;
}
if (bucket_has_pending_merge(*maybe_bucket, sender.getPendingMessageTracker())) {
LOG(debug, "A merge is pending for bucket %s, failing visitor", maybe_bucket->toString().c_str());
_visitor_op->fail_with_merge_pending(sender);
return;
}
auto token = _uuid_generator.generate_uuid();
auto bucket_handle = _operation_sequencer.try_acquire(*maybe_bucket, token);
if (!bucket_handle.valid()) {
LOG(debug, "An operation is already pending for bucket %s, failing visitor",
maybe_bucket->toString().c_str());
_visitor_op->fail_with_bucket_already_locked(sender);
return;
}
_visitor_op->assign_put_lock_access_token(token);
LOG(debug, "Possibly deferring start of visitor for bucket %s, using lock token %s",
maybe_bucket->toString().c_str(), token.c_str());
_message_tracker.run_once_no_pending_for_bucket(
*maybe_bucket,
make_deferred_task([self = shared_from_this(), handle = std::move(bucket_handle)](TaskRunState state) mutable {
LOG(debug, "Starting deferred visitor");
self->_visitor_op->assign_bucket_lock_handle(std::move(handle));
if (state == TaskRunState::OK) {
// Once started, ownership of _visitor_op will pass to the Distributor's OperationOwner
self->_stable_operation_owner.start(self->_visitor_op, 120/*TODO*/);
} else {
self->_visitor_op->onClose(self->_stable_operation_owner.sender());
}
}));
} else {
LOG(debug, "Failed verification of visitor, responding immediately");
assert(_visitor_op->has_sent_reply());
}
}
void ReadForWriteVisitorOperationStarter::onReceive(DistributorStripeMessageSender& sender,
const std::shared_ptr<api::StorageReply> & msg) {
_visitor_op->onReceive(sender, msg);
}
namespace {
struct MergePendingChecker : PendingMessageTracker::Checker {
bool has_pending_merge = false;
bool check(uint32_t message_type, [[maybe_unused]] uint16_t node, [[maybe_unused]] uint8_t priority) override {
if (message_type == api::MessageType::MERGEBUCKET_ID) {
has_pending_merge = true;
}
return true;
}
};
}
bool ReadForWriteVisitorOperationStarter::bucket_has_pending_merge(const document::Bucket& bucket,
const PendingMessageTracker& tracker) const {
MergePendingChecker merge_checker;
tracker.checkPendingMessages(bucket, merge_checker);
return merge_checker.has_pending_merge;
}
}
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