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// Test that distributed lock forcing does not result in inconsistencies, using a
// fast timeout. See comments about _testDistLockWithSkew in distlock_test.cpp for
// more details.
// Note that this test will always have random factors, since we can't control the
// thread scheduling.
// NOTE: this test is skipped when running smoke.py with --auth or --keyFile to force authentication
// in all tests.
var test = new SyncCCTest("sync6");
// Startup another process to handle our commands to the cluster, mostly so it's
// easier to read.
var commandConn = MongoRunner.runMongod({});
// Up the log level for this test
commandConn.getDB("admin").runCommand({setParameter: 1, logLevel: 1});
// Have lots of threads, so use larger i
// Can't test too many, we get socket exceptions... possibly due to the
// javascript console.
for (var i = 8; i < 9; i++) {
// Our force time is 8 seconds
// Slower machines can't keep up the LockPinger rate, which can lead to lock failures
// since our locks are only valid if the LockPinger pings faster than the force time.
// Actual lock timeout is 15 minutes, so a few seconds is extremely aggressive
var takeoverMS = 8000;
// Generate valid sleep and skew for this timeout
var threadSleepWithLock = takeoverMS / 2;
var configServerTimeSkew = [0, 0, 0];
for (var h = 0; h < 3; h++) {
// Skew by 1/30th the takeover time either way, at max
configServerTimeSkew[h] = (i + h) % Math.floor(takeoverMS / 60);
// Make skew pos or neg
configServerTimeSkew[h] *= ((i + h) % 2) ? -1 : 1;
}
// Build command
var command = {
_testDistLockWithSkew: 1
};
// Basic test parameters
command["lockName"] = "TimeSkewFailNewTest_lock_" + i;
command["host"] = test.url;
command["seed"] = i;
command["numThreads"] = (i % 50) + 1;
// Critical values so we're sure of correct operation
command["takeoverMS"] = takeoverMS;
command["wait"] = 4 * takeoverMS; // so we must force the lock
command["skewHosts"] = configServerTimeSkew;
command["threadWait"] = threadSleepWithLock;
// Less critical test params
// 1/3 of threads will not release the lock
command["hangThreads"] = 3;
// Amount of time to wait before trying lock again
command["threadSleep"] = 1; // ( ( i + 1 ) * 100 ) % (takeoverMS / 4)
// Amount of total clock skew possible between locking threads (processes)
// This can be large now.
command["skewRange"] = (command["takeoverMS"] * 3) * 60 * 1000;
// Double-check our sleep, host skew, and takeoverMS values again
// At maximum, our threads must sleep only half the lock timeout time.
assert(command["threadWait"] <= command["takeoverMS"] / 2);
for (var h = 0; h < command["skewHosts"].length; h++) {
// At maximum, our config server time skew needs to be less than 1/30th
// the total time skew (1/60th either way).
assert(Math.abs(command["skewHosts"][h]) <= (command["takeoverMS"] / 60));
}
var result = commandConn.getDB("admin").runCommand(command);
printjson(result);
printjson(command);
assert(result.ok, "Skewed threads did not increment correctly.");
}
MongoRunner.stopMongod(commandConn);
test.stop();
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