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/*
* Basic test of a succesful replica set rollback for DDL operations.
*
* This tests sets up a 3 node set, data-bearing nodes A and B and an arbiter.
*
* 1. A is elected PRIMARY and receives several writes, which are propagated to B.
* 2. A is isolated from the rest of the set and B is elected PRIMARY.
* 3. B receives several operations, which will later be undone during rollback.
* 4. B is then isolated and A regains its connection to the arbiter.
* 5. A receives many new operations, which B will replicate after rollback.
* 6. B rejoins the set and goes through the rollback process.
* 7. The contents of A and B are compare to ensure the rollback results in consistent nodes.
*/
load("jstests/replsets/rslib.js");
(function() {
"use strict";
// helper function for verifying contents at the end of the test
var checkFinalResults = function(db) {
assert.eq(2, db.b.getIndexes().length);
assert.eq(2, db.oldname.getIndexes().length);
assert.eq(2, db.oldname.find().itcount());
assert.eq(1, db.kap.find().itcount());
assert(db.kap.isCapped());
assert.eq(0, db.bar.count({q: 70}));
assert.eq(33, db.bar.findOne({q: 0})["y"]);
assert.eq(0, db.bar.count({q: 70}));
assert.eq(1, db.bar.count({txt: "foo"}));
assert.eq(200, db.bar.count({i: {$gt: -1}}));
assert.eq(6, db.bar.count({q: {$gt: -1}}));
assert.eq(0, db.getSiblingDB("abc").foo.find().itcount());
assert.eq(0, db.getSiblingDB("abc").bar.find().itcount());
};
var name = "rollback_ddl_op_sequences";
var replTest = new ReplSetTest({name: name, nodes: 3, useBridge: true});
var nodes = replTest.nodeList();
var conns = replTest.startSet();
replTest.initiate({
"_id": name,
"members": [
{"_id": 0, "host": nodes[0], priority: 3},
{"_id": 1, "host": nodes[1]},
{"_id": 2, "host": nodes[2], arbiterOnly: true}
]
});
// Make sure we have a master and that that master is node A
replTest.waitForState(replTest.nodes[0], ReplSetTest.State.PRIMARY);
var master = replTest.getPrimary();
var a_conn = conns[0];
a_conn.setSlaveOk();
var A = a_conn.getDB("admin");
var b_conn = conns[1];
b_conn.setSlaveOk();
var B = b_conn.getDB("admin");
assert.eq(master, conns[0], "conns[0] assumed to be master");
assert.eq(a_conn, master);
// Wait for initial replication
var a = a_conn.getDB("foo");
var b = b_conn.getDB("foo");
// initial data for both nodes
assert.writeOK(a.b.insert({x: 1}));
a.b.ensureIndex({x: 1});
assert.writeOK(a.oldname.insert({y: 1}));
assert.writeOK(a.oldname.insert({y: 2}));
a.oldname.ensureIndex({y: 1}, true);
assert.writeOK(a.bar.insert({q: 0}));
assert.writeOK(a.bar.insert({q: 1, a: "foo"}));
assert.writeOK(a.bar.insert({q: 2, a: "foo", x: 1}));
assert.writeOK(a.bar.insert({q: 3, bb: 9, a: "foo"}));
assert.writeOK(a.bar.insert({q: 40333333, a: 1}));
for (var i = 0; i < 200; i++) {
assert.writeOK(a.bar.insert({i: i}));
}
assert.writeOK(a.bar.insert({q: 40, a: 2}));
assert.writeOK(a.bar.insert({q: 70, txt: 'willremove'}));
a.createCollection("kap", {capped: true, size: 5000});
assert.writeOK(a.kap.insert({foo: 1}));
replTest.awaitReplication();
// isolate A and wait for B to become master
conns[0].disconnect(conns[1]);
conns[0].disconnect(conns[2]);
assert.soon(function() {
try {
return B.isMaster().ismaster;
} catch (e) {
return false;
}
});
// do operations on B and B alone, these will be rolled back
assert.writeOK(b.bar.insert({q: 4}));
assert.writeOK(b.bar.update({q: 3}, {q: 3, rb: true}));
assert.writeOK(b.bar.remove({q: 40})); // multi remove test
assert.writeOK(b.bar.update({q: 2}, {q: 39, rb: true}));
// rolling back a delete will involve reinserting the item(s)
assert.writeOK(b.bar.remove({q: 1}));
assert.writeOK(b.bar.update({q: 0}, {$inc: {y: 1}}));
assert.writeOK(b.kap.insert({foo: 2}));
assert.writeOK(b.kap2.insert({foo: 2}));
// create a collection (need to roll back the whole thing)
assert.writeOK(b.newcoll.insert({a: true}));
// create a new empty collection (need to roll back the whole thing)
b.createCollection("abc");
// drop a collection - we'll need all its data back!
b.bar.drop();
// drop an index - verify it comes back
b.b.dropIndexes();
// two to see if we transitively rollback?
b.oldname.renameCollection("newname");
b.newname.renameCollection("fooname");
assert(b.fooname.find().itcount() > 0, "count rename");
// create an index - verify that it is removed
b.fooname.ensureIndex({q: 1});
// test roll back (drop) a whole database
var abc = b.getSisterDB("abc");
assert.writeOK(abc.foo.insert({x: 1}));
assert.writeOK(abc.bar.insert({y: 999}));
// isolate B, bring A back into contact with the arbiter, then wait for A to become master
// insert new data into A so that B will need to rollback when it reconnects to A
conns[1].disconnect(conns[2]);
assert.soon(function() {
try {
return !B.isMaster().ismaster;
} catch (e) {
return false;
}
});
conns[0].reconnect(conns[2]);
assert.soon(function() {
try {
return A.isMaster().ismaster;
} catch (e) {
return false;
}
});
assert(a.bar.find().itcount() >= 1, "count check");
assert.writeOK(a.bar.insert({txt: 'foo'}));
assert.writeOK(a.bar.remove({q: 70}));
assert.writeOK(a.bar.update({q: 0}, {$inc: {y: 33}}));
// A is 1 2 3 7 8
// B is 1 2 3 4 5 6
// put B back in contact with A and arbiter, as A is primary, B will rollback and then catch up
conns[1].reconnect(conns[2]);
conns[0].reconnect(conns[1]);
awaitOpTime(b_conn, a_conn);
// await steady state and ensure the two nodes have the same contents
replTest.awaitSecondaryNodes();
replTest.awaitReplication();
checkFinalResults(a);
checkFinalResults(b);
// Verify data consistency between nodes.
replTest.checkReplicatedDataHashes();
replTest.checkOplogs();
replTest.stopSet(15);
}());
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