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/**
* Copyright (C) 2022-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/storage/wiredtiger/wiredtiger_index_util.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_prepare_conflict.h"
namespace mongo {
MONGO_FAIL_POINT_DEFINE(WTCompactIndexEBUSY);
bool WiredTigerIndexUtil::appendCustomStats(OperationContext* opCtx,
BSONObjBuilder* output,
double scale,
const std::string& uri) {
dassert(opCtx->lockState()->isReadLocked());
{
BSONObjBuilder metadata(output->subobjStart("metadata"));
Status status = WiredTigerUtil::getApplicationMetadata(opCtx, uri, &metadata);
if (!status.isOK()) {
metadata.append("error", "unable to retrieve metadata");
metadata.append("code", static_cast<int>(status.code()));
metadata.append("reason", status.reason());
}
}
std::string type, sourceURI;
WiredTigerUtil::fetchTypeAndSourceURI(opCtx, uri, &type, &sourceURI);
StatusWith<std::string> metadataResult = WiredTigerUtil::getMetadataCreate(opCtx, sourceURI);
StringData creationStringName("creationString");
if (!metadataResult.isOK()) {
BSONObjBuilder creationString(output->subobjStart(creationStringName));
creationString.append("error", "unable to retrieve creation config");
creationString.append("code", static_cast<int>(metadataResult.getStatus().code()));
creationString.append("reason", metadataResult.getStatus().reason());
} else {
output->append(creationStringName, metadataResult.getValue());
// Type can be "lsm" or "file"
output->append("type", type);
}
WiredTigerSession* session = WiredTigerRecoveryUnit::get(opCtx)->getSession();
WT_SESSION* s = session->getSession();
Status status =
WiredTigerUtil::exportTableToBSON(s, "statistics:" + uri, "statistics=(fast)", output);
if (!status.isOK()) {
output->append("error", "unable to retrieve statistics");
output->append("code", static_cast<int>(status.code()));
output->append("reason", status.reason());
}
return true;
}
Status WiredTigerIndexUtil::compact(OperationContext* opCtx, const std::string& uri) {
dassert(opCtx->lockState()->isWriteLocked());
WiredTigerSessionCache* cache = WiredTigerRecoveryUnit::get(opCtx)->getSessionCache();
if (!cache->isEphemeral()) {
WT_SESSION* s = WiredTigerRecoveryUnit::get(opCtx)->getSession()->getSession();
opCtx->recoveryUnit()->abandonSnapshot();
// WT compact prompts WT to take checkpoints, so we need to take the checkpoint lock around
// WT compact calls.
auto checkpointLock = opCtx->getServiceContext()->getStorageEngine()->getCheckpointLock(
opCtx, StorageEngine::CheckpointLock::Mode::kExclusive);
int ret = s->compact(s, uri.c_str(), "timeout=0");
if (MONGO_unlikely(WTCompactIndexEBUSY.shouldFail())) {
ret = EBUSY;
}
if (ret == EBUSY) {
return Status(ErrorCodes::Interrupted,
str::stream() << "Compaction interrupted on " << uri.c_str()
<< " due to cache eviction pressure");
}
invariantWTOK(ret, s);
}
return Status::OK();
}
bool WiredTigerIndexUtil::isEmpty(OperationContext* opCtx,
const std::string& uri,
uint64_t tableId) {
WiredTigerCursor curwrap(uri, tableId, false, opCtx);
WT_CURSOR* c = curwrap.get();
if (!c)
return true;
int ret = wiredTigerPrepareConflictRetry(opCtx, [&] { return c->next(c); });
if (ret == WT_NOTFOUND)
return true;
invariantWTOK(ret, c->session);
return false;
}
} // namespace mongo
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