mongodb/jstests/replsets/read_committed_no_snapshots.js

/**
 * Test basic read committed maxTimeMS timeout while waiting for a committed snapshot:
 *  - Reads with an 'afterOpTime' snapshot >= current time should be able to see things that
 *    happened before or at that opTime.
 *  - Reads should time out if there are no snapshots available on secondary.
 */

load("jstests/replsets/rslib.js");  // For reconfig and startSetIfSupportsReadMajority.

(function() {
"use strict";

// Set up a set and grab things for later.
var name = "read_committed_no_snapshots";
var replTest = new ReplSetTest({
    name: name,
    nodes: [
        {},
        {rsConfig: {priority: 0}},
        {
            setParameter: {"failpoint.disableSnapshotting": "{'mode':'alwaysOn'}"},
            rsConfig: {priority: 0}
        }
    ],
    nodeOptions: {enableMajorityReadConcern: ''},
    settings: {protocolVersion: 1}
});

if (!startSetIfSupportsReadMajority(replTest)) {
    jsTest.log("skipping test since storage engine doesn't support committed reads");
    replTest.stopSet();
    return;
}

// Cannot wait for a stable recovery timestamp due to the no-snapshot secondary.
replTest.initiateWithAnyNodeAsPrimary(
    null, "replSetInitiate", {doNotWaitForStableRecoveryTimestamp: true});

// Get connections and collection.
var primary = replTest.getPrimary();
var healthySecondary = replTest._slaves[0];
healthySecondary.setSlaveOk();
var noSnapshotSecondary = replTest._slaves[1];
noSnapshotSecondary.setSlaveOk();

// Do a write, wait for it to replicate, and ensure it is visible.
var res = primary.getDB(name).runCommandWithMetadata(  //
    {
        insert: "foo",
        documents: [{_id: 1, state: 0}],
        writeConcern: {w: "majority", wtimeout: ReplSetTest.kDefaultTimeoutMS}
    },
    {"$replData": 1});
assert.commandWorked(res.commandReply);

// We need to propagate the lastOpVisible from the primary as afterOpTime in the secondaries to
// ensure we wait for the write to be in the majority committed view.
var lastOp = res.commandReply["$replData"].lastOpVisible;

// Timeout is based on heartbeat timeout.
assert.commandWorked(healthySecondary.getDB(name).foo.runCommand(
    'find', {"readConcern": {"level": "majority", "afterOpTime": lastOp}, "maxTimeMS": 10 * 1000}));

// Ensure maxTimeMS times out while waiting for this snapshot
assert.commandFailedWithCode(noSnapshotSecondary.getDB(name).foo.runCommand(
                                 'find', {"readConcern": {"level": "majority"}, "maxTimeMS": 1000}),
                             ErrorCodes.MaxTimeMSExpired);

// Reconfig to make the no-snapshot secondary the primary
var config = primary.getDB("local").system.replset.findOne();
config.members[0].priority = 0;
config.members[2].priority = 1;
config.version++;
primary = reconfig(replTest, config, true);

// Ensure maxTimeMS times out while waiting for this snapshot
assert.commandFailedWithCode(primary.getSiblingDB(name).foo.runCommand(
                                 'find', {"readConcern": {"level": "majority"}, "maxTimeMS": 1000}),
                             ErrorCodes.MaxTimeMSExpired);
replTest.stopSet();
})();