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/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/repl/sync.h"
#include <string>
#include "mongo/db/jsobj.h"
#include "mongo/db/client.h"
#include "mongo/db/diskloc.h"
#include "mongo/db/namespace_details.h"
#include "mongo/db/repl/oplogreader.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
void Sync::setHostname(const string& hostname) {
hn = hostname;
}
BSONObj Sync::getMissingDoc(const BSONObj& o) {
OplogReader missingObjReader; // why are we using OplogReader to run a non-oplog query?
const char *ns = o.getStringField("ns");
// capped collections
NamespaceDetails *nsd = nsdetails(ns);
if ( nsd && nsd->isCapped() ) {
log() << "replication missing doc, but this is okay for a capped collection (" << ns << ")" << endl;
return BSONObj();
}
const int retryMax = 3;
for (int retryCount = 1; retryCount <= retryMax; ++retryCount) {
if (retryCount != 1) {
// if we are retrying, sleep a bit to let the network possibly recover
sleepsecs(retryCount * retryCount);
}
try {
bool ok = missingObjReader.connect(hn);
if (!ok) {
warning() << "network problem detected while connecting to the "
<< "sync source, attempt " << retryCount << " of "
<< retryMax << endl;
continue; // try again
}
}
catch (const SocketException&) {
warning() << "network problem detected while connecting to the "
<< "sync source, attempt " << retryCount << " of "
<< retryMax << endl;
continue; // try again
}
// might be more than just _id in the update criteria
BSONObj query = BSONObjBuilder().append(o.getObjectField("o2")["_id"]).obj();
BSONObj missingObj;
try {
missingObj = missingObjReader.findOne(ns, query);
}
catch (const SocketException&) {
warning() << "network problem detected while fetching a missing document from the "
<< "sync source, attempt " << retryCount << " of "
<< retryMax << endl;
continue; // try again
}
catch (DBException& e) {
log() << "replication assertion fetching missing object: " << e.what() << endl;
throw;
}
// success!
return missingObj;
}
// retry count exceeded
msgasserted(15916,
str::stream() << "Can no longer connect to initial sync source: " << hn);
}
bool Sync::shouldRetry(const BSONObj& o) {
// should already have write lock
const char *ns = o.getStringField("ns");
Client::Context ctx(ns);
// we don't have the object yet, which is possible on initial sync. get it.
log() << "replication info adding missing object" << endl; // rare enough we can log
BSONObj missingObj = getMissingDoc(o);
if( missingObj.isEmpty() ) {
log() << "replication missing object not found on source. presumably deleted later in oplog" << endl;
log() << "replication o2: " << o.getObjectField("o2").toString() << endl;
log() << "replication o firstfield: " << o.getObjectField("o").firstElementFieldName() << endl;
return false;
}
else {
DiskLoc d = theDataFileMgr.insert(ns, (void*) missingObj.objdata(), missingObj.objsize());
uassert(15917, "Got bad disk location when attempting to insert", !d.isNull());
LOG(1) << "replication inserted missing doc: " << missingObj.toString() << endl;
return true;
}
}
}
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