92 lines
3.2 KiB
JavaScript
92 lines
3.2 KiB
JavaScript
// test that a rollback of an update with empty o2 causes a message to be logged
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//
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// If all data-bearing nodes in a replica set are using an ephemeral storage engine, the set will
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// not be able to survive a scenario where all data-bearing nodes are down simultaneously. In such a
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// scenario, none of the members will have any data, and upon restart will each look for a member to
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// inital sync from, so no primary will be elected. This test induces such a scenario, so cannot be
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// run on ephemeral storage engines.
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// @tags: [requires_persistence]
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// function to check the logs for an entry
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doesEntryMatch = function(array, regex) {
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var found = false;
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for (i = 0; i < array.length; i++) {
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if (regex.test(array[i])) {
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found = true;
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}
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}
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return found;
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};
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// set up a set and grab things for later
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var name = "rollback_empty_o2";
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var replTest = new ReplSetTest({name: name, nodes: 3});
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var nodes = replTest.nodeList();
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var conns = replTest.startSet();
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replTest.initiate({
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"_id": name,
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"members": [
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{"_id": 0, "host": nodes[0], priority: 3},
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{"_id": 1, "host": nodes[1]},
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{"_id": 2, "host": nodes[2], arbiterOnly: true}
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]
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});
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var a_conn = conns[0];
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var b_conn = conns[1];
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var AID = replTest.getNodeId(a_conn);
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var BID = replTest.getNodeId(b_conn);
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replTest.waitForState(replTest.nodes[0], ReplSetTest.State.PRIMARY, 60 * 1000);
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// get master and do an initial write
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var master = replTest.getPrimary();
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assert(master === conns[0], "conns[0] assumed to be master");
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assert(a_conn.host === master.host, "a_conn assumed to be master");
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var options = {writeConcern: {w: 2, wtimeout: 60000}, upsert: true};
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assert.writeOK(a_conn.getDB(name).foo.insert({x: 1}, options));
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// shut down master
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replTest.stop(AID);
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// insert a fake oplog entry with an empty o2
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master = replTest.getPrimary();
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assert(b_conn.host === master.host, "b_conn assumed to be master");
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options = {
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writeConcern: {w: 1, wtimeout: 60000},
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upsert: true
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};
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// another insert to set minvalid ahead
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assert.writeOK(b_conn.getDB(name).foo.insert({x: 123}));
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var oplog_entry = b_conn.getDB("local").oplog.rs.find().sort({$natural: -1})[0];
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oplog_entry["ts"] = Timestamp(oplog_entry["ts"].t, oplog_entry["ts"].i + 1);
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oplog_entry["op"] = "u";
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oplog_entry["o2"] = {};
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assert.writeOK(b_conn.getDB("local").oplog.rs.insert(oplog_entry));
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// shut down B and bring back the original master
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replTest.stop(BID);
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replTest.restart(AID);
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master = replTest.getPrimary();
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assert(a_conn.host === master.host, "a_conn assumed to be master");
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// do a write so that B will have to roll back
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options = {
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writeConcern: {w: 1, wtimeout: 60000},
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upsert: true
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};
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assert.writeOK(a_conn.getDB(name).foo.insert({x: 2}, options));
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// restart B, which should rollback and log a message about not rolling back empty o2'd oplog entry
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replTest.restart(BID);
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var msg = RegExp("ignoring op on rollback : ");
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assert.soon(function() {
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try {
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var log = b_conn.getDB("admin").adminCommand({getLog: "global"}).log;
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return doesEntryMatch(log, msg);
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} catch (e) {
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return false;
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}
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}, "Did not see a log entry about skipping the empty o2'd oplog entry during rollback");
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replTest.stopSet();
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