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|
// test rollback in replica sets
// try running as :
//
// mongo --nodb rollback.js | tee out | grep -v ^m31
//
var debugging = 0;
function pause(s) {
print(s);
while (debugging) {
sleep(3000);
print(s);
}
}
function deb(obj) {
if( debugging ) {
print("\n\n\n" + obj + "\n\n");
}
}
w = 0;
function wait(f) {
w++;
var n = 0;
while (!f()) {
if( n % 4 == 0 )
print("waiting " + w);
if (++n == 4) {
print("" + f);
}
sleep(1000);
}
}
function dbs_match(a, b) {
print("dbs_match");
var ac = a.system.namespaces.find().sort({name:1}).toArray();
var bc = b.system.namespaces.find().sort({name:1}).toArray();
if (!friendlyEqual(ac, bc)) {
print("dbs_match: namespaces don't match");
return false;
}
var c = a.getCollectionNames();
for( var i in c ) {
print("checking " + c[i]);
if( !friendlyEqual( a[c[i]].find().sort({_id:1}).toArray(), b[c[i]].find().sort({_id:1}).toArray() ) ) {
print("dbs_match: collections don't match " + c[i]);
return false;
}
}
return true;
}
/* these writes will be initial data and replicate everywhere. */
function doInitialWrites(db) {
t = db.bar;
t.insert({ q: 1, a: "foo" });
t.insert({ q: 2, a: "foo", x: 1 });
t.insert({ q: 3, bb: 9, a: "foo" });
t.insert({ q: 40, a: 1 });
t.insert({ q: 40, a: 2 });
t.insert({ q: 70, txt: 'willremove' });
}
/* these writes on one primary only and will be rolled back. */
function doItemsToRollBack(db) {
t = db.bar;
t.insert({ q: 4 });
t.update({ q: 3 }, { q: 3, rb: true });
t.remove({ q: 40 }); // multi remove test
t.update({ q: 2 }, { q: 39, rb: true });
// rolling back a delete will involve reinserting the item(s)
t.remove({q:1});
}
function doWritesToKeep2(db) {
t = db.bar;
t.insert({ txt: 'foo' });
t.remove({ q: 70 });
}
function verify(db) {
print("verify");
t = db.bar;
assert(t.find({ q: 1 }).count() == 1);
assert(t.find({ txt: 'foo' }).count() == 1);
assert(t.find({ q: 4 }).count() == 0);
}
doTest = function (signal) {
var replTest = new ReplSetTest({ name: 'unicomplex', nodes: 3 });
var nodes = replTest.nodeList();
//print(tojson(nodes));
var conns = replTest.startSet();
var r = replTest.initiate({ "_id": "unicomplex",
"members": [
{ "_id": 0, "host": nodes[0] },
{ "_id": 1, "host": nodes[1] },
{ "_id": 2, "host": nodes[2], arbiterOnly: true}]
});
// Make sure we have a master
var master = replTest.getMaster();
a_conn = conns[0];
A = a_conn.getDB("admin");
b_conn = conns[1];
a_conn.setSlaveOk();
b_conn.setSlaveOk();
B = b_conn.getDB("admin");
assert(master == conns[0], "conns[0] assumed to be master");
assert(a_conn == master);
//deb(master);
// Make sure we have an arbiter
assert.soon(function () {
res = conns[2].getDB("admin").runCommand({ replSetGetStatus: 1 });
return res.myState == 7;
}, "Arbiter failed to initialize.");
// Wait for initial replication
var a = a_conn.getDB("foo");
var b = b_conn.getDB("foo");
doInitialWrites(a);
// wait for secondary to get this data
wait(function () { return b.bar.count() == a.bar.count(); });
A.runCommand({ replSetTest: 1, blind: true });
wait(function () { return B.isMaster().ismaster; });
doItemsToRollBack(b);
// a should not have the new data as it was in blind state.
B.runCommand({ replSetTest: 1, blind: true });
A.runCommand({ replSetTest: 1, blind: false });
wait(function () { return !B.isMaster().ismaster; });
wait(function () { return A.isMaster().ismaster; });
assert(a.bar.count() >= 1, "count check");
doWritesToKeep2(a);
// A is 1 2 3 7 8
// B is 1 2 3 4 5 6
// bring B back online
// as A is primary, B will roll back and then catch up
B.runCommand({ replSetTest: 1, blind: false });
wait(function () { return B.isMaster().ismaster || B.isMaster().secondary; });
// everyone is up here...
assert(A.isMaster().ismaster || A.isMaster().secondary, "A up");
assert(B.isMaster().ismaster || B.isMaster().secondary, "B up");
verify(a);
assert( dbs_match(a,b), "server data sets do not match after rollback, something is wrong");
pause("SUCCESS");
replTest.stopSet(signal);
}
doTest( 15 );
|
