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/**
* Copyright (C) 2018-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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/insert_group.h"
#include <algorithm>
#include <iterator>
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/ops/write_ops.h"
#include "mongo/db/repl/oplog_applier_impl.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/logv2/log.h"
#include "mongo/util/assert_util.h"
namespace mongo {
namespace repl {
namespace {
// Must not create too large an object.
const auto kInsertGroupMaxGroupSize = write_ops::insertVectorMaxBytes;
// Limit number of ops in a single group.
constexpr auto kInsertGroupMaxOpCount = 64;
} // namespace
InsertGroup::InsertGroup(std::vector<const OplogEntry*>* ops,
OperationContext* opCtx,
InsertGroup::Mode mode)
: _doNotGroupBeforePoint(ops->cbegin()), _end(ops->cend()), _opCtx(opCtx), _mode(mode) {}
StatusWith<InsertGroup::ConstIterator> InsertGroup::groupAndApplyInserts(ConstIterator it) {
const auto& entry = **it;
// The following conditions must be met before attempting to group the oplog entries starting
// at 'oplogEntriesIterator':
// 1) The CRUD operation must an insert;
// 2) The namespace that we are inserting into cannot be a capped collection;
// 3) We have not attempted to group this insert during a previous call to this function.
if (entry.getOpType() != OpTypeEnum::kInsert) {
return Status(ErrorCodes::TypeMismatch, "Can only group insert operations.");
}
if (entry.isForCappedCollection) {
return Status(ErrorCodes::InvalidOptions,
"Cannot group insert operations on capped collections.");
}
if (it <= _doNotGroupBeforePoint) {
return Status(ErrorCodes::InvalidPath,
"Cannot group an insert operation that we previously attempted to group.");
}
// Attempt to group 'insert' ops if possible.
std::vector<BSONObj> toInsert;
// Make sure to include the first op in the group size.
size_t groupSize = entry.getObject().objsize();
auto opCount = std::vector<const OplogEntry*>::size_type(1);
auto groupNamespace = entry.getNss();
/**
* Search for the op that delimits this insert group, and save its position
* in endOfGroupableOpsIterator. For example, given the following list of oplog
* entries with a sequence of groupable inserts:
*
* S--------------E
* u, u, u, i, i, i, i, i, d, d
*
* S: start of insert group
* E: end of groupable ops
*
* E is the position of endOfGroupableOpsIterator. i.e. endOfGroupableOpsIterator
* will point to the first op that *can't* be added to the current insert group.
*/
auto endOfGroupableOpsIterator =
std::find_if(it + 1, _end, [&](const OplogEntry* nextEntry) -> bool {
auto opNamespace = nextEntry->getNss();
groupSize += nextEntry->getObject().objsize();
opCount += 1;
// Only add the op to this group if it passes the criteria.
return nextEntry->getOpType() != OpTypeEnum::kInsert // Must be an insert.
|| opNamespace != groupNamespace // Must be in the same namespace.
|| groupSize > kInsertGroupMaxGroupSize // Must not create too large an object.
|| opCount > kInsertGroupMaxOpCount; // Limit number of ops in a single group.
});
// See if we were able to create a group that contains more than a single op.
if (std::distance(it, endOfGroupableOpsIterator) == 1) {
return Status(ErrorCodes::NoSuchKey,
"Not able to create a group with more than a single insert operation");
}
// Create an oplog entry group for grouped inserts.
OplogEntryOrGroupedInserts groupedInserts(it, endOfGroupableOpsIterator);
try {
// Apply the group of inserts by passing in groupedInserts.
uassertStatusOK(applyOplogEntryOrGroupedInserts(_opCtx, groupedInserts, _mode));
// It succeeded, advance the oplogEntriesIterator to the end of the
// group of inserts.
return endOfGroupableOpsIterator - 1;
} catch (...) {
// The group insert failed, log an error and fall through to the
// application of an individual op.
auto status = exceptionToStatus().withContext(
str::stream() << "Error applying inserts in bulk: " << redact(groupedInserts.toBSON())
<< ". Trying first insert as a lone insert: " << redact(entry.getRaw()));
// It's not an error during initial sync to encounter DuplicateKey errors.
if (Mode::kInitialSync == _mode && ErrorCodes::DuplicateKey == status) {
LOGV2_DEBUG(21203, 2, "{status}", "status"_attr = status);
} else {
LOGV2_ERROR(21204, "{status}", "status"_attr = status);
}
// Avoid quadratic run time from failed insert by not retrying until we
// are beyond this group of ops.
_doNotGroupBeforePoint = endOfGroupableOpsIterator - 1;
return status;
}
MONGO_UNREACHABLE;
}
} // namespace repl
} // namespace mongo
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