void CatalogManagerReplicaSet::logAction(OperationContext* txn, const ActionLogType& actionLog) {
if (_actionLogCollectionCreated.load() == 0) {
BSONObj createCmd = BSON("create" << ActionLogType::ConfigNS << "capped" << true << "size"
<< kActionLogCollectionSize);
auto result =
grid.shardRegistry()->runCommandOnConfigWithNotMasterRetries("config", createCmd);
if (!result.isOK()) {
LOG(1) << "couldn't create actionlog collection: " << causedBy(result.getStatus());
return;
}
Status commandStatus = Command::getStatusFromCommandResult(result.getValue());
if (commandStatus.isOK() || commandStatus == ErrorCodes::NamespaceExists) {
_actionLogCollectionCreated.store(1);
} else {
LOG(1) << "couldn't create actionlog collection: " << causedBy(commandStatus);
return;
}
}
Status result = insert(txn, ActionLogType::ConfigNS, actionLog.toBSON(), NULL);
if (!result.isOK()) {
log() << "error encountered while logging action: " << result;
}
}
static void _reportRound(ActionLogType& actionLog) {
try {
ScopedDbConnection conn(configServer.getConnectionString(), 30);
// send a copy of the message to the log in case it doesn't reach config.actionlog
actionLog.setTime(jsTime());
LOG(1) << "about to log balancer result: " << actionLog;
// The following method is not thread safe. However, there is only one balancer
// thread per mongos process. The create collection is a a no-op when the collection
// already exists
static bool createActionlog = false;
if (!createActionlog) {
try {
static const int actionLogSizeBytes = 1024 * 1024 * 2;
conn->createCollection(ActionLogType::ConfigNS, actionLogSizeBytes, true);
} catch (const DBException& ex) {
LOG(1) << "config.actionlog could not be created, another mongos process "
<< "may have done so" << causedBy(ex);
}
createActionlog = true;
}
Status result = clusterInsert(
ActionLogType::ConfigNS, actionLog.toBSON(), WriteConcernOptions::AllConfigs, NULL);
if (!result.isOK()) {
log() << "Error encountered while logging action from balancer " << result.reason();
}
conn.done();
} catch (const DBException& ex) {
// if we got here, it means the config change is only in the log;
// the change didn't make it to config.actionlog
warning() << "could not log balancer result" << causedBy(ex);
}
}