678 lines
27 KiB
C++
678 lines
27 KiB
C++
/* @file rs_rollback.cpp
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*
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pch.h"
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#include "../client.h"
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#include "../../client/dbclient.h"
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#include "rs.h"
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#include "../repl.h"
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#include "../query.h"
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/* Scenarios
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We went offline with ops not replicated out.
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F = node that failed and coming back.
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P = node that took over, new primary
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#1:
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F : a b c d e f g
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P : a b c d q
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The design is "keep P". One could argue here that "keep F" has some merits, however, in most cases P
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will have significantly more data. Also note that P may have a proper subset of F's stream if there were
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no subsequent writes.
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For now the model is simply : get F back in sync with P. If P was really behind or something, we should have
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just chosen not to fail over anyway.
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#2:
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F : a b c d e f g -> a b c d
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P : a b c d
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#3:
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F : a b c d e f g -> a b c d q r s t u v w x z
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P : a b c d.q r s t u v w x z
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Steps
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find an event in common. 'd'.
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undo our events beyond that by:
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(1) taking copy from other server of those objects
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(2) do not consider copy valid until we pass reach an optime after when we fetched the new version of object
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-- i.e., reset minvalid.
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(3) we could skip operations on objects that are previous in time to our capture of the object as an optimization.
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*/
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namespace mongo {
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using namespace bson;
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bool copyCollectionFromRemote(const string& host, const string& ns, const BSONObj& query, string& errmsg, bool logforrepl);
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void incRBID();
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class rsfatal : public std::exception {
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public:
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virtual const char* what() const throw() { return "replica set fatal exception"; }
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};
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struct DocID {
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const char *ns;
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be _id;
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bool operator<(const DocID& d) const {
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int c = strcmp(ns, d.ns);
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if( c < 0 ) return true;
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if( c > 0 ) return false;
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return _id < d._id;
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}
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};
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struct HowToFixUp {
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/* note this is a set -- if there are many $inc's on a single document we need to rollback, we only
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need to refetch it once. */
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set<DocID> toRefetch;
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/* collections to drop */
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set<string> toDrop;
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set<string> collectionsToResync;
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OpTime commonPoint;
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DiskLoc commonPointOurDiskloc;
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int rbid; // remote server's current rollback sequence #
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};
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static void refetch(HowToFixUp& h, const BSONObj& ourObj) {
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const char *op = ourObj.getStringField("op");
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if( *op == 'n' )
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return;
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unsigned long long totSize = 0;
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totSize += ourObj.objsize();
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if( totSize > 512 * 1024 * 1024 )
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throw "rollback too large";
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DocID d;
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// NOTE The assigned ns value may become invalid if we yield.
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d.ns = ourObj.getStringField("ns");
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if( *d.ns == 0 ) {
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log() << "replSet WARNING ignoring op on rollback no ns TODO : " << ourObj.toString() << rsLog;
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return;
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}
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bo o = ourObj.getObjectField(*op=='u' ? "o2" : "o");
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if( o.isEmpty() ) {
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log() << "replSet warning ignoring op on rollback : " << ourObj.toString() << rsLog;
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return;
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}
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if( *op == 'c' ) {
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be first = o.firstElement();
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NamespaceString s(d.ns); // foo.$cmd
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string cmdname = first.fieldName();
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Command *cmd = Command::findCommand(cmdname.c_str());
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if( cmd == 0 ) {
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log() << "replSet warning rollback no suchcommand " << first.fieldName() << " - different mongod versions perhaps?" << rsLog;
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return;
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}
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else {
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/* findandmodify - tranlated?
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godinsert?,
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renamecollection a->b. just resync a & b
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*/
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if( cmdname == "create" ) {
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/* Create collection operation
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{ ts: ..., h: ..., op: "c", ns: "foo.$cmd", o: { create: "abc", ... } }
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*/
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string ns = s.db + '.' + o["create"].String(); // -> foo.abc
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h.toDrop.insert(ns);
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return;
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}
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else if( cmdname == "drop" ) {
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string ns = s.db + '.' + first.valuestr();
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h.collectionsToResync.insert(ns);
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return;
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}
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else if( cmdname == "dropIndexes" || cmdname == "deleteIndexes" ) {
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/* TODO: this is bad. we simply full resync the collection here, which could be very slow. */
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log() << "replSet info rollback of dropIndexes is slow in this version of mongod" << rsLog;
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string ns = s.db + '.' + first.valuestr();
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h.collectionsToResync.insert(ns);
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return;
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}
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else if( cmdname == "renameCollection" ) {
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/* TODO: slow. */
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log() << "replSet info rollback of renameCollection is slow in this version of mongod" << rsLog;
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string from = first.valuestr();
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string to = o["to"].String();
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h.collectionsToResync.insert(from);
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h.collectionsToResync.insert(to);
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return;
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}
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else if( cmdname == "reIndex" ) {
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return;
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}
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else if( cmdname == "dropDatabase" ) {
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log() << "replSet error rollback : can't rollback drop database full resync will be required" << rsLog;
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log() << "replSet " << o.toString() << rsLog;
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throw rsfatal();
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}
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else {
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log() << "replSet error can't rollback this command yet: " << o.toString() << rsLog;
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log() << "replSet cmdname=" << cmdname << rsLog;
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throw rsfatal();
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}
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}
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}
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d._id = o["_id"];
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if( d._id.eoo() ) {
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log() << "replSet WARNING ignoring op on rollback no _id TODO : " << d.ns << ' '<< ourObj.toString() << rsLog;
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return;
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}
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h.toRefetch.insert(d);
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}
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int getRBID(DBClientConnection*);
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static void syncRollbackFindCommonPoint(DBClientConnection *them, HowToFixUp& h) {
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static time_t last;
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if( time(0)-last < 60 ) {
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throw "findcommonpoint waiting a while before trying again";
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}
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last = time(0);
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assert( dbMutex.atLeastReadLocked() );
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Client::Context c(rsoplog);
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NamespaceDetails *nsd = nsdetails(rsoplog);
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assert(nsd);
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ReverseCappedCursor u(nsd);
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if( !u.ok() )
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throw "our oplog empty or unreadable";
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const Query q = Query().sort(reverseNaturalObj);
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const bo fields = BSON( "ts" << 1 << "h" << 1 );
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//auto_ptr<DBClientCursor> u = us->query(rsoplog, q, 0, 0, &fields, 0, 0);
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h.rbid = getRBID(them);
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auto_ptr<DBClientCursor> t = them->query(rsoplog, q, 0, 0, &fields, 0, 0);
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if( t.get() == 0 || !t->more() ) throw "remote oplog empty or unreadable";
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BSONObj ourObj = u.current();
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OpTime ourTime = ourObj["ts"]._opTime();
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BSONObj theirObj = t->nextSafe();
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OpTime theirTime = theirObj["ts"]._opTime();
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{
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long long diff = (long long) ourTime.getSecs() - ((long long) theirTime.getSecs());
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/* diff could be positive, negative, or zero */
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log() << "replSet info rollback our last optime: " << ourTime.toStringPretty() << rsLog;
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log() << "replSet info rollback their last optime: " << theirTime.toStringPretty() << rsLog;
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log() << "replSet info rollback diff in end of log times: " << diff << " seconds" << rsLog;
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if( diff > 3600 ) {
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log() << "replSet rollback too long a time period for a rollback." << rsLog;
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throw "error not willing to roll back more than one hour of data";
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}
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}
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unsigned long long scanned = 0;
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while( 1 ) {
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scanned++;
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/* todo add code to assure no excessive scanning for too long */
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if( ourTime == theirTime ) {
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if( ourObj["h"].Long() == theirObj["h"].Long() ) {
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// found the point back in time where we match.
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// todo : check a few more just to be careful about hash collisions.
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log() << "replSet rollback found matching events at " << ourTime.toStringPretty() << rsLog;
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log() << "replSet rollback findcommonpoint scanned : " << scanned << rsLog;
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h.commonPoint = ourTime;
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h.commonPointOurDiskloc = u.currLoc();
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return;
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}
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refetch(h, ourObj);
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if( !t->more() ) {
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log() << "replSet rollback error RS100 reached beginning of remote oplog" << rsLog;
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log() << "replSet them: " << them->toString() << " scanned: " << scanned << rsLog;
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log() << "replSet theirTime: " << theirTime.toStringLong() << rsLog;
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log() << "replSet ourTime: " << ourTime.toStringLong() << rsLog;
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throw "RS100 reached beginning of remote oplog [2]";
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}
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theirObj = t->nextSafe();
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theirTime = theirObj["ts"]._opTime();
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u.advance();
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if( !u.ok() ) {
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log() << "replSet rollback error RS101 reached beginning of local oplog" << rsLog;
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log() << "replSet them: " << them->toString() << " scanned: " << scanned << rsLog;
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log() << "replSet theirTime: " << theirTime.toStringLong() << rsLog;
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log() << "replSet ourTime: " << ourTime.toStringLong() << rsLog;
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throw "RS101 reached beginning of local oplog [1]";
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}
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ourObj = u.current();
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ourTime = ourObj["ts"]._opTime();
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}
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else if( theirTime > ourTime ) {
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if( !t->more() ) {
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log() << "replSet rollback error RS100 reached beginning of remote oplog" << rsLog;
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log() << "replSet them: " << them->toString() << " scanned: " << scanned << rsLog;
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log() << "replSet theirTime: " << theirTime.toStringLong() << rsLog;
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log() << "replSet ourTime: " << ourTime.toStringLong() << rsLog;
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throw "RS100 reached beginning of remote oplog [1]";
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}
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theirObj = t->nextSafe();
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theirTime = theirObj["ts"]._opTime();
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}
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else {
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// theirTime < ourTime
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refetch(h, ourObj);
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u.advance();
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if( !u.ok() ) {
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log() << "replSet rollback error RS101 reached beginning of local oplog" << rsLog;
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log() << "replSet them: " << them->toString() << " scanned: " << scanned << rsLog;
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log() << "replSet theirTime: " << theirTime.toStringLong() << rsLog;
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log() << "replSet ourTime: " << ourTime.toStringLong() << rsLog;
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throw "RS101 reached beginning of local oplog [2]";
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}
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ourObj = u.current();
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ourTime = ourObj["ts"]._opTime();
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}
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}
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}
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struct X {
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const bson::bo *op;
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bson::bo goodVersionOfObject;
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};
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static void setMinValid(bo newMinValid) {
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try {
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log() << "replSet minvalid=" << newMinValid["ts"]._opTime().toStringLong() << rsLog;
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}
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catch(...) { }
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{
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Helpers::putSingleton("local.replset.minvalid", newMinValid);
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Client::Context cx( "local." );
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cx.db()->flushFiles(true);
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}
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}
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void ReplSetImpl::syncFixUp(HowToFixUp& h, OplogReader& r) {
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DBClientConnection *them = r.conn();
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// fetch all first so we needn't handle interruption in a fancy way
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unsigned long long totSize = 0;
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list< pair<DocID,bo> > goodVersions;
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bo newMinValid;
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/* fetch all the goodVersions of each document from current primary */
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DocID d;
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unsigned long long n = 0;
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try {
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for( set<DocID>::iterator i = h.toRefetch.begin(); i != h.toRefetch.end(); i++ ) {
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d = *i;
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assert( !d._id.eoo() );
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{
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/* TODO : slow. lots of round trips. */
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n++;
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bo good= them->findOne(d.ns, d._id.wrap()).getOwned();
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totSize += good.objsize();
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uassert( 13410, "replSet too much data to roll back", totSize < 300 * 1024 * 1024 );
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// note good might be eoo, indicating we should delete it
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goodVersions.push_back(pair<DocID,bo>(d,good));
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}
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}
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newMinValid = r.getLastOp(rsoplog);
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if( newMinValid.isEmpty() ) {
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sethbmsg("rollback error newMinValid empty?");
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return;
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}
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}
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catch(DBException& e) {
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sethbmsg(str::stream() << "rollback re-get objects: " << e.toString(),0);
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log() << "rollback couldn't re-get ns:" << d.ns << " _id:" << d._id << ' ' << n << '/' << h.toRefetch.size() << rsLog;
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throw e;
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}
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MemoryMappedFile::flushAll(true);
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sethbmsg("rollback 3.5");
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if( h.rbid != getRBID(r.conn()) ) {
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// our source rolled back itself. so the data we received isn't necessarily consistent.
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sethbmsg("rollback rbid on source changed during rollback, cancelling this attempt");
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return;
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}
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// update them
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sethbmsg(str::stream() << "rollback 4 n:" << goodVersions.size());
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bool warn = false;
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assert( !h.commonPointOurDiskloc.isNull() );
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dbMutex.assertWriteLocked();
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/* we have items we are writing that aren't from a point-in-time. thus best not to come online
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until we get to that point in freshness. */
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setMinValid(newMinValid);
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/** any full collection resyncs required? */
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if( !h.collectionsToResync.empty() ) {
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for( set<string>::iterator i = h.collectionsToResync.begin(); i != h.collectionsToResync.end(); i++ ) {
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string ns = *i;
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sethbmsg(str::stream() << "rollback 4.1 coll resync " << ns);
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Client::Context c(*i);
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try {
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bob res;
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string errmsg;
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dropCollection(ns, errmsg, res);
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{
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dbtemprelease r;
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bool ok = copyCollectionFromRemote(them->getServerAddress(), ns, bo(), errmsg, false);
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if( !ok ) {
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log() << "replSet rollback error resyncing collection " << ns << ' ' << errmsg << rsLog;
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throw "rollback error resyncing rollection [1]";
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}
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}
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}
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catch(...) {
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log() << "replset rollback error resyncing collection " << ns << rsLog;
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throw "rollback error resyncing rollection [2]";
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}
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}
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/* we did more reading from primary, so check it again for a rollback (which would mess us up), and
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make minValid newer.
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*/
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sethbmsg("rollback 4.2");
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{
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string err;
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try {
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newMinValid = r.getLastOp(rsoplog);
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if( newMinValid.isEmpty() ) {
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err = "can't get minvalid from primary";
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}
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else {
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setMinValid(newMinValid);
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}
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}
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catch(...) {
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err = "can't get/set minvalid";
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}
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if( h.rbid != getRBID(r.conn()) ) {
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// our source rolled back itself. so the data we received isn't necessarily consistent.
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// however, we've now done writes. thus we have a problem.
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err += "rbid at primary changed during resync/rollback";
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}
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if( !err.empty() ) {
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log() << "replSet error rolling back : " << err << ". A full resync will be necessary." << rsLog;
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/* todo: reset minvalid so that we are permanently in fatal state */
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/* todo: don't be fatal, but rather, get all the data first. */
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sethbmsg("rollback error");
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throw rsfatal();
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}
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}
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sethbmsg("rollback 4.3");
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}
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sethbmsg("rollback 4.6");
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/** drop collections to drop before doing individual fixups - that might make things faster below actually if there were subsequent inserts to rollback */
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for( set<string>::iterator i = h.toDrop.begin(); i != h.toDrop.end(); i++ ) {
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Client::Context c(*i);
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try {
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bob res;
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string errmsg;
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log(1) << "replSet rollback drop: " << *i << rsLog;
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dropCollection(*i, errmsg, res);
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}
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catch(...) {
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log() << "replset rollback error dropping collection " << *i << rsLog;
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}
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}
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sethbmsg("rollback 4.7");
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Client::Context c(rsoplog);
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NamespaceDetails *oplogDetails = nsdetails(rsoplog);
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uassert(13423, str::stream() << "replSet error in rollback can't find " << rsoplog, oplogDetails);
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map<string,shared_ptr<RemoveSaver> > removeSavers;
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unsigned deletes = 0, updates = 0;
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for( list<pair<DocID,bo> >::iterator i = goodVersions.begin(); i != goodVersions.end(); i++ ) {
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const DocID& d = i->first;
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bo pattern = d._id.wrap(); // { _id : ... }
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try {
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assert( d.ns && *d.ns );
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if( h.collectionsToResync.count(d.ns) ) {
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/* we just synced this entire collection */
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continue;
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}
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getDur().commitIfNeeded();
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/* keep an archive of items rolled back */
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shared_ptr<RemoveSaver>& rs = removeSavers[d.ns];
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if ( ! rs )
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rs.reset( new RemoveSaver( "rollback" , "" , d.ns ) );
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// todo: lots of overhead in context, this can be faster
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Client::Context c(d.ns);
|
|
if( i->second.isEmpty() ) {
|
|
// wasn't on the primary; delete.
|
|
/* TODO1.6 : can't delete from a capped collection. need to handle that here. */
|
|
deletes++;
|
|
|
|
NamespaceDetails *nsd = nsdetails(d.ns);
|
|
if( nsd ) {
|
|
if( nsd->capped ) {
|
|
/* can't delete from a capped collection - so we truncate instead. if this item must go,
|
|
so must all successors!!! */
|
|
try {
|
|
/** todo: IIRC cappedTrunateAfter does not handle completely empty. todo. */
|
|
// this will crazy slow if no _id index.
|
|
long long start = Listener::getElapsedTimeMillis();
|
|
DiskLoc loc = Helpers::findOne(d.ns, pattern, false);
|
|
if( Listener::getElapsedTimeMillis() - start > 200 )
|
|
log() << "replSet warning roll back slow no _id index for " << d.ns << " perhaps?" << rsLog;
|
|
//would be faster but requires index: DiskLoc loc = Helpers::findById(nsd, pattern);
|
|
if( !loc.isNull() ) {
|
|
try {
|
|
nsd->cappedTruncateAfter(d.ns, loc, true);
|
|
}
|
|
catch(DBException& e) {
|
|
if( e.getCode() == 13415 ) {
|
|
// hack: need to just make cappedTruncate do this...
|
|
nsd->emptyCappedCollection(d.ns);
|
|
}
|
|
else {
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
catch(DBException& e) {
|
|
log() << "replSet error rolling back capped collection rec " << d.ns << ' ' << e.toString() << rsLog;
|
|
}
|
|
}
|
|
else {
|
|
try {
|
|
deletes++;
|
|
deleteObjects(d.ns, pattern, /*justone*/true, /*logop*/false, /*god*/true, rs.get() );
|
|
}
|
|
catch(...) {
|
|
log() << "replSet error rollback delete failed ns:" << d.ns << rsLog;
|
|
}
|
|
}
|
|
// did we just empty the collection? if so let's check if it even exists on the source.
|
|
if( nsd->stats.nrecords == 0 ) {
|
|
try {
|
|
string sys = cc().database()->name + ".system.namespaces";
|
|
bo o = them->findOne(sys, QUERY("name"<<d.ns));
|
|
if( o.isEmpty() ) {
|
|
// we should drop
|
|
try {
|
|
bob res;
|
|
string errmsg;
|
|
dropCollection(d.ns, errmsg, res);
|
|
}
|
|
catch(...) {
|
|
log() << "replset error rolling back collection " << d.ns << rsLog;
|
|
}
|
|
}
|
|
}
|
|
catch(DBException& ) {
|
|
/* this isn't *that* big a deal, but is bad. */
|
|
log() << "replSet warning rollback error querying for existence of " << d.ns << " at the primary, ignoring" << rsLog;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
// todo faster...
|
|
OpDebug debug;
|
|
updates++;
|
|
_updateObjects(/*god*/true, d.ns, i->second, pattern, /*upsert=*/true, /*multi=*/false , /*logtheop=*/false , debug, rs.get() );
|
|
}
|
|
}
|
|
catch(DBException& e) {
|
|
log() << "replSet exception in rollback ns:" << d.ns << ' ' << pattern.toString() << ' ' << e.toString() << " ndeletes:" << deletes << rsLog;
|
|
warn = true;
|
|
}
|
|
}
|
|
|
|
removeSavers.clear(); // this effectively closes all of them
|
|
|
|
sethbmsg(str::stream() << "rollback 5 d:" << deletes << " u:" << updates);
|
|
MemoryMappedFile::flushAll(true);
|
|
sethbmsg("rollback 6");
|
|
|
|
// clean up oplog
|
|
log(2) << "replSet rollback truncate oplog after " << h.commonPoint.toStringPretty() << rsLog;
|
|
// todo: fatal error if this throws?
|
|
oplogDetails->cappedTruncateAfter(rsoplog, h.commonPointOurDiskloc, false);
|
|
|
|
/* reset cached lastoptimewritten and h value */
|
|
loadLastOpTimeWritten();
|
|
|
|
sethbmsg("rollback 7");
|
|
MemoryMappedFile::flushAll(true);
|
|
|
|
// done
|
|
if( warn )
|
|
sethbmsg("issues during syncRollback, see log");
|
|
else
|
|
sethbmsg("rollback done");
|
|
}
|
|
|
|
void ReplSetImpl::syncRollback(OplogReader&r) {
|
|
unsigned s = _syncRollback(r);
|
|
if( s )
|
|
sleepsecs(s);
|
|
}
|
|
|
|
unsigned ReplSetImpl::_syncRollback(OplogReader&r) {
|
|
assert( !lockedByMe() );
|
|
assert( !dbMutex.atLeastReadLocked() );
|
|
|
|
sethbmsg("rollback 0");
|
|
|
|
writelocktry lk(rsoplog, 20000);
|
|
if( !lk.got() ) {
|
|
sethbmsg("rollback couldn't get write lock in a reasonable time");
|
|
return 2;
|
|
}
|
|
|
|
if( box.getState().secondary() ) {
|
|
/* by doing this, we will not service reads (return an error as we aren't in secondary staate.
|
|
that perhaps is moot becasue of the write lock above, but that write lock probably gets deferred
|
|
or removed or yielded later anyway.
|
|
|
|
also, this is better for status reporting - we know what is happening.
|
|
*/
|
|
box.change(MemberState::RS_ROLLBACK, _self);
|
|
}
|
|
|
|
HowToFixUp how;
|
|
sethbmsg("rollback 1");
|
|
{
|
|
r.resetCursor();
|
|
/*DBClientConnection us(false, 0, 0);
|
|
string errmsg;
|
|
if( !us.connect(HostAndPort::me().toString(),errmsg) ) {
|
|
sethbmsg("rollback connect to self failure" + errmsg);
|
|
return;
|
|
}*/
|
|
|
|
sethbmsg("rollback 2 FindCommonPoint");
|
|
try {
|
|
syncRollbackFindCommonPoint(r.conn(), how);
|
|
}
|
|
catch( const char *p ) {
|
|
sethbmsg(string("rollback 2 error ") + p);
|
|
return 10;
|
|
}
|
|
catch( rsfatal& ) {
|
|
_fatal();
|
|
return 2;
|
|
}
|
|
catch( DBException& e ) {
|
|
sethbmsg(string("rollback 2 exception ") + e.toString() + "; sleeping 1 min");
|
|
dbtemprelease r;
|
|
sleepsecs(60);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
sethbmsg("replSet rollback 3 fixup");
|
|
|
|
{
|
|
incRBID();
|
|
try {
|
|
syncFixUp(how, r);
|
|
}
|
|
catch( rsfatal& ) {
|
|
sethbmsg("rollback fixup error");
|
|
_fatal();
|
|
return 2;
|
|
}
|
|
catch(...) {
|
|
incRBID(); throw;
|
|
}
|
|
incRBID();
|
|
|
|
/* success - leave "ROLLBACK" state
|
|
can go to SECONDARY once minvalid is achieved
|
|
*/
|
|
box.change(MemberState::RS_RECOVERING, _self);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
}
|