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/**
* Tests that unconditional step down terminates writes, but not reads. And, doesn't disconnect
* the connections if primary is stepping down to secondary.
* @tags: [requires_document_locking]
*/
(function() {
"use strict";
load("jstests/libs/curop_helpers.js"); // for waitForCurOpByFailPoint().
const testName = "txnsDuringStepDown";
const dbName = testName;
const collName = "testcoll";
const collNss = dbName + '.' + collName;
const rst = new ReplSetTest({nodes: [{}, {rsConfig: {priority: 0}}, {arbiter: true}]});
rst.startSet();
rst.initiate();
let primary;
let secondary;
let primaryDB;
function refreshConnection() {
primary = rst.getPrimary();
primaryDB = primary.getDB(dbName);
secondary = rst.getSecondary();
}
refreshConnection();
jsTestLog("Writing data to collection.");
assert.commandWorked(primaryDB.runCommand({insert: collName, documents: [{_id: 'readOp'}]}));
rst.awaitReplication();
const readFailPoint = "waitInFindBeforeMakingBatch";
const writeFailPoint = "hangWithLockDuringBatchInsert";
TestData.dbName = dbName;
TestData.collName = collName;
TestData.readFailPoint = readFailPoint;
TestData.skipRetryOnNetworkError = true;
function runStepDownTest({testMsg, stepDownFn, toRemovedState}) {
jsTestLog(`Testing step down due to ${testMsg}`);
// 'toRemovedState' determines whether to tag the connections not to close when
// primary changes its state to removed.
toRemovedState = toRemovedState || false;
// Clears the log before running the test.
assert.commandWorked(primary.adminCommand({clearLog: 'global'}));
jsTestLog("Enable fail point for namespace '" + collNss + "'");
// Find command.
assert.commandWorked(primary.adminCommand({
configureFailPoint: readFailPoint,
data: {nss: collNss, shouldCheckForInterrupt: true},
mode: "alwaysOn"
}));
// Insert command.
assert.commandWorked(primary.adminCommand({
configureFailPoint: writeFailPoint,
data: {nss: collNss, shouldCheckForInterrupt: true},
mode: "alwaysOn"
}));
var startSafeParallelShell = (func, port) => {
TestData.func = func;
var safeFunc = (toRemovedState) ? () => {
assert.commandWorked(db.adminCommand({isMaster: 1, hangUpOnStepDown: false}));
TestData.func();
} : func;
return startParallelShell(safeFunc, port);
};
const joinReadThread = startSafeParallelShell(() => {
jsTestLog("Start blocking find cmd before step down");
var findRes = assert.commandWorked(
db.getSiblingDB(TestData.dbName).runCommand({"find": TestData.collName}));
assert.eq(findRes.cursor.firstBatch.length, 1);
}, primary.port);
const joinWriteThread = startSafeParallelShell(() => {
jsTestLog("Start blocking insert cmd before step down");
assert.commandFailedWithCode(
db.getSiblingDB(TestData.dbName)[TestData.collName].insert([{val: 'writeOp1'}]),
ErrorCodes.InterruptedDueToReplStateChange);
}, primary.port);
const joinUnblockStepDown = startSafeParallelShell(() => {
jsTestLog("Wait for step down to start killing operations");
checkLog.contains(db, "Starting to kill user operations");
jsTestLog("Unblock step down");
// Turn off fail point on find cmd to allow step down to continue.
assert.commandWorked(
db.adminCommand({configureFailPoint: TestData.readFailPoint, mode: "off"}));
}, primary.port);
jsTestLog("Wait for find cmd to reach the fail point");
waitForCurOpByFailPoint(primaryDB, collNss, readFailPoint);
jsTestLog("Wait for write cmd to reach the fail point");
waitForCurOpByFailPoint(primaryDB, collNss, writeFailPoint);
let res = assert.commandWorked(primary.adminCommand({replSetGetStatus: 1}));
assert(res.electionCandidateMetrics,
() => "Response should have an 'electionCandidateMetrics' field: " + tojson(res));
jsTestLog("Trigger step down");
var oldConfig = stepDownFn();
// Waits for all threads to join.
joinUnblockStepDown();
joinReadThread();
joinWriteThread();
// Wait till the primary stepped down to primary.
waitForState(primary,
(toRemovedState) ? ReplSetTest.State.REMOVED : ReplSetTest.State.SECONDARY);
assert.commandWorked(primary.adminCommand({configureFailPoint: writeFailPoint, mode: "off"}));
// Check that the 'electionCandidateMetrics' section of the replSetGetStatus response has been
// cleared, since the node is no longer primary.
if (!toRemovedState) {
res = assert.commandWorked(primary.adminCommand({replSetGetStatus: 1}));
assert(
!res.electionCandidateMetrics,
() => "Response should not have an 'electionCandidateMetrics' field: " + tojson(res));
}
// Get the new primary.
refreshConnection();
}
function runStepsDowntoRemoved(params) {
var oldConfigBeforeTest = rst.getReplSetConfigFromNode();
// Run the test.
params["toRemovedState"] = true;
runStepDownTest(params);
oldConfigBeforeTest.version = ++(rst.getReplSetConfigFromNode().version);
// On exit, add the removed node back to replica set.
assert.commandWorked(primary.adminCommand({replSetReconfig: oldConfigBeforeTest, force: true}));
refreshConnection();
}
runStepDownTest({
testMsg: "reconfig command",
stepDownFn: () => {
load("./jstests/replsets/rslib.js");
var newConfig = rst.getReplSetConfigFromNode();
var oldMasterId = rst.getNodeId(primary);
var newMasterId = rst.getNodeId(secondary);
newConfig.members[oldMasterId].priority = 0;
newConfig.members[newMasterId].priority = 1;
newConfig.version++;
// Run it on primary
assert.commandWorked(primary.adminCommand({replSetReconfig: newConfig, force: true}));
}
});
runStepDownTest({
testMsg: "reconfig via heartbeat",
stepDownFn: () => {
load("./jstests/replsets/rslib.js");
var newConfig = rst.getReplSetConfigFromNode();
var oldMasterId = rst.getNodeId(primary);
var newMasterId = rst.getNodeId(secondary);
newConfig.members[oldMasterId].priority = 0;
newConfig.members[newMasterId].priority = 1;
newConfig.version++;
// Run it on secondary
assert.commandWorked(secondary.adminCommand({replSetReconfig: newConfig, force: true}));
}
});
runStepsDowntoRemoved({
testMsg: "reconfig via heartbeat - primary to removed",
stepDownFn: () => {
load("./jstests/replsets/rslib.js");
var newConfig = rst.getReplSetConfigFromNode();
var oldMasterId = rst.getNodeId(primary);
var newMasterId = rst.getNodeId(secondary);
newConfig.members[newMasterId].priority = 1;
// Remove the current primary from the config
newConfig.members.splice(oldMasterId, 1);
newConfig.version++;
// Run it on secondary
assert.commandWorked(secondary.adminCommand({replSetReconfig: newConfig, force: true}));
}
});
runStepDownTest({
testMsg: "stepdown via heartbeat",
stepDownFn: () => {
load("./jstests/replsets/rslib.js");
var newConfig = rst.getReplSetConfigFromNode();
var newMasterId = rst.getNodeId(secondary);
newConfig.members[newMasterId].priority = 2;
newConfig.version++;
// Run it on primary
assert.commandWorked(primary.adminCommand({replSetReconfig: newConfig, force: false}));
// Now, step up the secondary which will make the current primary to step down.
rst.stepUp(secondary);
}
});
rst.stopSet();
})();
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