std::unique_ptr<Fetcher> AbstractOplogFetcher::_makeFetcher(const BSONObj& findCommandObj,
const BSONObj& metadataObj) {
return stdx::make_unique<Fetcher>(
_getExecutor(),
_source,
_nss.db().toString(),
findCommandObj,
[this](const StatusWith<Fetcher::QueryResponse>& resp,
Fetcher::NextAction*,
BSONObjBuilder* builder) { return _callback(resp, builder); },
metadataObj,
_getFindMaxTime() + kNetworkTimeoutBufferMS,
_getGetMoreMaxTime() + kNetworkTimeoutBufferMS);
}
BSONObj OplogFetcher::_makeFindCommandObject(const NamespaceString& nss,
OpTime lastOpTimeFetched) const {
auto lastCommittedWithCurrentTerm =
_dataReplicatorExternalState->getCurrentTermAndLastCommittedOpTime();
auto term = lastCommittedWithCurrentTerm.value;
BSONObjBuilder cmdBob;
cmdBob.append("find", nss.coll());
cmdBob.append("filter", BSON("ts" << BSON("$gte" << lastOpTimeFetched.getTimestamp())));
cmdBob.append("tailable", true);
cmdBob.append("oplogReplay", true);
cmdBob.append("awaitData", true);
cmdBob.append("maxTimeMS", durationCount<Milliseconds>(_getFindMaxTime()));
cmdBob.append("batchSize", _batchSize);
if (term != OpTime::kUninitializedTerm) {
cmdBob.append("term", term);
}
// This ensures that the sync source never returns an empty batch of documents for the first set
// of results.
cmdBob.append("readConcern", BSON("afterClusterTime" << lastOpTimeFetched.getTimestamp()));
return cmdBob.obj();
}
