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// Test handling of clock skew and optimes across mongod instances
//
// There is no automatic fail-over in a master/slave deployment, so if the master goes down, no new
// master will be elected. Therefore if the master is using an ephemeral storage engine, it cannot
// be restarted without losing all data. This test expects that restarting the master will maintain
// the node's data, so cannot be run with ephemeral storage engines.
// @tags: [requires_persistence]
var baseName = "jstests_repl_master1test";
oplog = function() {
return m.getDB("local").oplog.$main;
};
lastop = function() {
return oplog().find().sort({$natural: -1}).next();
};
am = function() {
return m.getDB(baseName).a;
};
rt = new ReplTest(baseName);
m = rt.start(true);
am().save({});
assert.eq("i", lastop().op);
op = lastop();
printjson(op);
op.ts.t = op.ts.t + 600000; // 10 minutes
assert.commandWorked(m.getDB("local").runCommand({godinsert: "oplog.$main", obj: op}));
rt.stop(true);
m = rt.start(true, null, true);
assert.eq(op.ts.t, lastop().ts.t);
am().save({});
assert.eq(op.ts.t, lastop().ts.t);
assert.eq(op.ts.i + 1, lastop().ts.i);
op = lastop();
printjson(op);
op.ts.i = Math.pow(2, 31) - 1;
printjson(op);
assert.commandWorked(m.getDB("local").runCommand({godinsert: "oplog.$main", obj: op}));
rt.stop(true);
m = rt.start(true, null, true);
assert.eq(op.ts.i, lastop().ts.i);
assert.throws(function() {
am().save({}); // triggers fassert because ofclock skew
});
assert.neq(0, rt.stop(true)); // fasserted
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