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// Tests writeConcern metrics in the serverStatus output.
// @tags: [
// requires_journaling,
// requires_persistence,
// requires_replication,
// ]
(function() {
"use strict";
// Verifies that the server status response has the fields that we expect.
function verifyServerStatusFields(serverStatusResponse) {
assert(serverStatusResponse.hasOwnProperty("opWriteConcernCounters"),
"Expected the serverStatus response to have a 'opWriteConcernCounters' field\n" +
tojson(serverStatusResponse));
assert(serverStatusResponse.opWriteConcernCounters.hasOwnProperty("insert"),
"The 'opWriteConcernCounters' field in serverStatus did not have the 'insert' field\n" +
tojson(serverStatusResponse.opWriteConcernCounters));
assert(serverStatusResponse.opWriteConcernCounters.hasOwnProperty("update"),
"The 'opWriteConcernCounters' field in serverStatus did not have the 'update' field\n" +
tojson(serverStatusResponse.opWriteConcernCounters));
assert(serverStatusResponse.opWriteConcernCounters.hasOwnProperty("delete"),
"The 'opWriteConcernCounters' field in serverStatus did not have the 'delete' field\n" +
tojson(serverStatusResponse.opWriteConcernCounters));
}
// Verifies that the given path of the server status response is incremented in the way we
// expect, and no other changes occurred. This function modifies its inputs.
function verifyServerStatusChange(initialStats, newStats, path, expectedIncrement) {
// Traverse to the parent of the changed element.
let pathComponents = path.split(".");
let initialParent = initialStats;
let newParent = newStats;
for (let i = 0; i < pathComponents.length - 1; i++) {
assert(initialParent.hasOwnProperty(pathComponents[i]),
"initialStats did not contain component " + i + " of path " + path +
", initialStats: " + tojson(initialStats));
initialParent = initialParent[pathComponents[i]];
assert(newParent.hasOwnProperty(pathComponents[i]),
"newStats did not contain component " + i + " of path " + path +
", newStats: " + tojson(newStats));
newParent = newParent[pathComponents[i]];
}
// Test the expected increment of the changed element. The element may not exist in the
// initial stats, in which case it is treated as 0.
let lastPathComponent = pathComponents[pathComponents.length - 1];
let initialValue = 0;
if (initialParent.hasOwnProperty(lastPathComponent)) {
initialValue = initialParent[lastPathComponent];
}
assert(newParent.hasOwnProperty(lastPathComponent),
"newStats did not contain last component of path " + path +
", newStats: " + tojson(newStats));
assert.eq(initialValue + expectedIncrement,
newParent[lastPathComponent],
"expected " + path + " to increase by " + expectedIncrement +
", initialStats: " + tojson(initialStats) + ", newStats: " + tojson(newStats));
// Delete the changed element.
delete initialParent[lastPathComponent];
delete newParent[lastPathComponent];
// The stats objects should be equal without the changed element.
assert.eq(0,
bsonWoCompare(initialStats, newStats),
"expected initialStats and newStats to be equal after removing " + path +
", initialStats: " + tojson(initialStats) + ", newStats: " + tojson(newStats));
}
const rst = new ReplSetTest(
{nodes: 2, nodeOptions: {setParameter: 'reportOpWriteConcernCountersInServerStatus=true'}});
rst.startSet();
let config = rst.getReplSetConfig();
config.members[1].priority = 0;
config.members[0].tags = {
dc_va: "rack1"
};
config.settings = {
getLastErrorModes: {myTag: {dc_va: 1}}
};
rst.initiate(config);
const primary = rst.getPrimary();
const secondary = rst.getSecondary();
const dbName = "test";
const collName = "server_write_concern_metrics";
const testDB = primary.getDB(dbName);
const testColl = testDB[collName];
function resetCollection(setupCommand) {
testColl.drop();
assert.commandWorked(testDB.createCollection(collName));
if (setupCommand) {
assert.commandWorked(testDB.runCommand(setupCommand));
}
}
function testWriteConcernMetrics(cmd, opName, inc, setupCommand) {
// Run command with no writeConcern.
resetCollection(setupCommand);
let serverStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(testDB.runCommand(cmd));
let newStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusChange(serverStatus.opWriteConcernCounters,
newStatus.opWriteConcernCounters,
opName + ".none",
inc);
// Run command with writeConcern {j: true}. This should be counted as having no 'w' value.
resetCollection(setupCommand);
serverStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(
testDB.runCommand(Object.assign(Object.assign({}, cmd), {writeConcern: {j: true}})));
newStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusChange(serverStatus.opWriteConcernCounters,
newStatus.opWriteConcernCounters,
opName + ".none",
inc);
// Run command with writeConcern {w: "majority"}.
resetCollection(setupCommand);
serverStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(
testDB.runCommand(Object.assign(Object.assign({}, cmd), {writeConcern: {w: "majority"}})));
newStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusChange(serverStatus.opWriteConcernCounters,
newStatus.opWriteConcernCounters,
opName + ".wmajority",
inc);
// Run command with writeConcern {w: 0}.
resetCollection(setupCommand);
serverStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(
testDB.runCommand(Object.assign(Object.assign({}, cmd), {writeConcern: {w: 0}})));
newStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusChange(serverStatus.opWriteConcernCounters,
newStatus.opWriteConcernCounters,
opName + ".wnum.0",
inc);
// Run command with writeConcern {w: 1}.
resetCollection(setupCommand);
serverStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(
testDB.runCommand(Object.assign(Object.assign({}, cmd), {writeConcern: {w: 1}})));
newStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusChange(serverStatus.opWriteConcernCounters,
newStatus.opWriteConcernCounters,
opName + ".wnum.1",
inc);
// Run command with writeConcern {w: 2}.
resetCollection(setupCommand);
serverStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(
testDB.runCommand(Object.assign(Object.assign({}, cmd), {writeConcern: {w: 2}})));
newStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusChange(serverStatus.opWriteConcernCounters,
newStatus.opWriteConcernCounters,
opName + ".wnum.2",
inc);
// Run command with writeConcern {w: "myTag"}.
resetCollection(setupCommand);
serverStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(
testDB.runCommand(Object.assign(Object.assign({}, cmd), {writeConcern: {w: "myTag"}})));
newStatus = assert.commandWorked(testDB.adminCommand({serverStatus: 1}));
verifyServerStatusChange(serverStatus.opWriteConcernCounters,
newStatus.opWriteConcernCounters,
opName + ".wtag.myTag",
inc);
// writeConcern metrics are not tracked on the secondary.
resetCollection(setupCommand);
serverStatus = assert.commandWorked(secondary.adminCommand({serverStatus: 1}));
verifyServerStatusFields(serverStatus);
assert.commandWorked(testDB.runCommand(cmd));
newStatus = assert.commandWorked(secondary.adminCommand({serverStatus: 1}));
assert.eq(0,
bsonWoCompare(serverStatus.opWriteConcernCounters, newStatus.opWriteConcernCounters),
"expected no change in secondary writeConcern metrics, before: " +
tojson(serverStatus) + ", after: " + tojson(newStatus));
}
// Test single insert/update/delete.
testWriteConcernMetrics({insert: collName, documents: [{}]}, "insert", 1);
testWriteConcernMetrics({update: collName, updates: [{q: {}, u: {$set: {a: 1}}}]}, "update", 1);
testWriteConcernMetrics({delete: collName, deletes: [{q: {}, limit: 1}]}, "delete", 1);
// Test batch writes.
testWriteConcernMetrics({insert: collName, documents: [{}, {}]}, "insert", 2);
testWriteConcernMetrics(
{update: collName, updates: [{q: {}, u: {$set: {a: 1}}}, {q: {}, u: {$set: {a: 1}}}]},
"update",
2);
testWriteConcernMetrics(
{delete: collName, deletes: [{q: {}, limit: 1}, {q: {}, limit: 1}]}, "delete", 2);
// Test applyOps. All sequences of setup + command must be idempotent in steady-state oplog
// application, as testWriteConcernMetrics will run them multiple times.
testWriteConcernMetrics(
{applyOps: [{op: "i", ns: testColl.getFullName(), o: {_id: 0}}]}, "insert", 1);
testWriteConcernMetrics(
{applyOps: [{op: "u", ns: testColl.getFullName(), o2: {_id: 0}, o: {$set: {a: 1}}}]},
"update",
1);
testWriteConcernMetrics({applyOps: [{op: "d", ns: testColl.getFullName(), o: {_id: 0}}]},
"delete",
1,
{insert: collName, documents: [{_id: 0}]});
rst.stopSet();
}());
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