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/**
* Tests that flow control outputs a log when it is maximally engaged on some cadence.
*
* @tags: [
* requires_flow_control,
* requires_majority_read_concern,
* requires_replication,
* ]
*/
(function() {
"use strict";
const replSet = new ReplSetTest({name: "flow_control_logging", nodes: 3});
replSet.startSet({
setParameter: {
flowControlSamplePeriod: 1, // Increase resolution to detect lag in a light write workload.
flowControlWarnThresholdSeconds: 1,
// Configure flow control to engage after one second of lag.
flowControlTargetLagSeconds: 1,
flowControlThresholdLagPercentage: 1,
// Use a speedy no-op writer to avoid needing a robust background writer.
writePeriodicNoops: true,
periodicNoopIntervalSecs:
2 // replSet.initiate() can hang with a one second interval for reasons.
}
});
replSet.initiate();
// Stop replication which will pin the commit point.
for (let sec of replSet.getSecondaries()) {
assert.commandWorked(sec.adminCommand(
{configureFailPoint: "pauseBatchApplicationAfterWritingOplogEntries", mode: "alwaysOn"}));
}
const timeoutMilliseconds = 30 * 1000;
// The test has stopped replication and the primary's no-op writer is configured to create an
// oplog entry every other second. Once the primary notices the sustainer rate is not moving, it
// should start logging a warning once per second. This check waits for two log messages to make
// sure the appropriate state variables are being reset.
checkLog.containsWithAtLeastCount(replSet.getPrimary(),
"Flow control is engaged and the sustainer point is not moving.",
2,
timeoutMilliseconds);
// Restart replication so the replica set will shut down.
for (let sec of replSet.getSecondaries()) {
assert.commandWorked(sec.adminCommand(
{configureFailPoint: "pauseBatchApplicationAfterWritingOplogEntries", mode: "off"}));
}
replSet.stopSet();
})();
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