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/**
* Copyright (C) 2023-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/timeseries/bucket_catalog/bucket.h"
namespace mongo::timeseries::bucket_catalog {
namespace {
uint8_t numDigits(uint32_t num) {
uint8_t numDigits = 0;
while (num) {
num /= 10;
++numDigits;
}
return numDigits;
}
} // namespace
Bucket::Bucket(
const BucketId& bId, const BucketKey& k, StringData tf, Date_t mt, BucketStateRegistry& bsr)
: bucketId(bId),
key(k),
timeField(tf.toString()),
minTime(mt),
bucketStateRegistry(bsr),
lastChecked(getCurrentEraAndIncrementBucketCount(bucketStateRegistry)) {}
Bucket::~Bucket() {
decrementBucketCountForEra(bucketStateRegistry, lastChecked);
}
bool allCommitted(const Bucket& bucket) {
return bucket.batches.empty() && !bucket.preparedBatch;
}
bool schemaIncompatible(Bucket& bucket,
const BSONObj& input,
boost::optional<StringData> metaField,
const StringData::ComparatorInterface* comparator) {
auto result = bucket.schema.update(input, metaField, comparator);
return (result == Schema::UpdateStatus::Failed);
}
void calculateBucketFieldsAndSizeChange(const Bucket& bucket,
const BSONObj& doc,
boost::optional<StringData> metaField,
Bucket::NewFieldNames& newFieldNamesToBeInserted,
int32_t& sizeToBeAdded) {
// BSON size for an object with an empty object field where field name is empty string.
// We can use this as an offset to know the size when we have real field names.
static constexpr int emptyObjSize = 12;
// Validate in debug builds that this size is correct
dassert(emptyObjSize == BSON("" << BSONObj()).objsize());
newFieldNamesToBeInserted.clear();
sizeToBeAdded = 0;
auto numMeasurementsFieldLength = numDigits(bucket.numMeasurements);
for (const auto& elem : doc) {
auto fieldName = elem.fieldNameStringData();
if (fieldName == metaField) {
// Ignore the metadata field since it will not be inserted.
continue;
}
auto hashedKey = StringSet::hasher().hashed_key(fieldName);
if (!bucket.fieldNames.contains(hashedKey)) {
// Record the new field name only if it hasn't been committed yet. There could
// be concurrent batches writing to this bucket with the same new field name,
// but they're not guaranteed to commit successfully.
newFieldNamesToBeInserted.push_back(hashedKey);
// Only update the bucket size once to account for the new field name if it
// isn't already pending a commit from another batch.
if (!bucket.uncommittedFieldNames.contains(hashedKey)) {
// Add the size of an empty object with that field name.
sizeToBeAdded += emptyObjSize + fieldName.size();
// The control.min and control.max summaries don't have any information for
// this new field name yet. Add two measurements worth of data to account
// for this. As this is the first measurement for this field, min == max.
sizeToBeAdded += elem.size() * 2;
}
}
// Add the element size, taking into account that the name will be changed to its
// positional number. Add 1 to the calculation since the element's field name size
// accounts for a null terminator whereas the stringified position does not.
sizeToBeAdded += elem.size() - elem.fieldNameSize() + numMeasurementsFieldLength + 1;
}
}
std::shared_ptr<WriteBatch> activeBatch(Bucket& bucket,
OperationId opId,
std::uint8_t stripe,
ExecutionStatsController& stats) {
auto it = bucket.batches.find(opId);
if (it == bucket.batches.end()) {
it = bucket.batches
.try_emplace(opId,
std::make_shared<WriteBatch>(
BucketHandle{bucket.bucketId, stripe}, opId, stats))
.first;
}
return it->second;
}
} // namespace mongo::timeseries::bucket_catalog
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