// Open the dictionary. Creates it if necessary.
bool IndexDetails::open(const bool may_create) {
const string dname = indexNamespace();
if (may_create) {
addNewNamespaceToCatalog(dname);
}
TOKULOG(1) << "Opening IndexDetails " << dname << endl;
try {
_db.reset(new storage::Dictionary(dname, _info, *_descriptor, may_create,
_info["background"].trueValue()));
return true;
} catch (storage::Dictionary::NeedsCreate) {
if (cc().upgradingSystemUsers() &&
isSystemUsersCollection(parentNS()) &&
keyPattern() == oldSystemUsersKeyPattern) {
// We're upgrading the system.users collection, and we are missing the old index.
// That's ok, we'll signal the caller about this by returning a NULL pointer from
// IndexDetails::make. See #673
return false;
}
// Unlike for NamespaceIndex, this dictionary must exist on disk if we think it should
// exist. This error only gets thrown if may_create is false, which happens when we're
// trying to open a collection for which we have serialized info. Therefore, this is a
// fatal non-user error.
msgasserted(16988, mongoutils::str::stream() << "dictionary " << dname
<< " should exist, but we got ENOENT");
}
}
// Open the dictionary. Creates it if necessary.
bool IndexDetailsBase::open(const bool may_create, const bool use_memcmp_magic) {
const string dname = indexNamespace();
TOKULOG(1) << "Opening IndexDetails " << dname << endl;
try {
// We use the memcmp magic API only for single-key, ascending _id indexes,
// because the _id field is always unique (and therefore we can simply
// compare the OID fields if they exist and that will be sufficient)
if (use_memcmp_magic) {
verify(_unique);
}
_db.reset(new storage::Dictionary(dname, _info, *_descriptor, may_create,
_info["background"].trueValue(), use_memcmp_magic));
return true;
} catch (storage::Dictionary::NeedsCreate) {
if (cc().upgradingSystemUsers() &&
isSystemUsersCollection(parentNS()) &&
keyPattern() == oldSystemUsersKeyPattern) {
// We're upgrading the system.users collection, and we are missing the old index.
// That's ok, we'll signal the caller about this by returning a NULL pointer from
// IndexDetailsBase::make. See #673
return false;
}
// This dictionary must exist on disk if we think it should exist.
// This error only gets thrown if may_create is false, which happens when we're
// trying to open a collection for which we have serialized info.
// Therefore, this is a fatal non-user error.
msgasserted(16988, mongoutils::str::stream() << "dictionary " << dname
<< " should exist, but we got ENOENT");
}
}
