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/**
* Tests what happens when a shard goes down with pooled connections.
*
* This test involves restarting a standalone shard, so cannot be run on ephemeral storage engines.
* A restarted standalone will lose all data when using an ephemeral storage engine.
*
* MongoD cannot downgrade after a hard crash, or restart from standalone.
*
* @tags: [multiversion_incompatible,requires_persistence]
*/
// Checking UUID consistency involves talking to a shard node, which in this test is shutdown
TestData.skipCheckingUUIDsConsistentAcrossCluster = true;
// Run through the same test twice, once with a hard -9 kill, once with a regular shutdown
(function() {
'use strict';
for (var test = 0; test < 2; test++) {
var killWith = (test == 0 ? 15 : 9);
var st = new ShardingTest({shards: 1});
var mongos = st.s0;
var coll = mongos.getCollection("foo.bar");
var db = coll.getDB();
assert.commandWorked(coll.insert({hello: "world"}));
jsTest.log("Creating new connections...");
// Create a bunch of connections to the primary node through mongos.
// jstest ->(x10)-> mongos ->(x10)-> primary
var conns = [];
for (var i = 0; i < 50; i++) {
conns.push(new Mongo(mongos.host));
assert.neq(null, conns[i].getCollection(coll + "").findOne());
}
jsTest.log("Returning the connections back to the pool.");
for (var i = 0; i < conns.length; i++) {
conns[i].close();
}
// Log connPoolStats for debugging purposes.
var connPoolStats = mongos.getDB("admin").runCommand({connPoolStats: 1});
printjson(connPoolStats);
jsTest.log("Shutdown shard " + (killWith == 9 ? "uncleanly" : "") + "...");
// Flush writes to disk, since sometimes we're killing uncleanly
assert(mongos.getDB("admin").runCommand({fsync: 1}).ok);
var exitCode = killWith === 9 ? MongoRunner.EXIT_SIGKILL : MongoRunner.EXIT_CLEAN;
for (let node of st.rs0.nodes) {
st.rs0.stop(
st.rs0.getNodeId(node), killWith, {allowedExitCode: exitCode}, {forRestart: true});
}
jsTest.log("Restart shard...");
st.rs0.startSet({forceLock: true}, true);
jsTest.log("Waiting for socket timeout time...");
// Need to wait longer than the socket polling time.
sleep(2 * 5000);
jsTest.log("Run queries using new connections.");
var numErrors = 0;
for (var i = 0; i < conns.length; i++) {
var newConn = new Mongo(mongos.host);
try {
assert.neq(null, newConn.getCollection("foo.bar").findOne());
} catch (e) {
printjson(e);
numErrors++;
}
}
assert.eq(0, numErrors);
st.stop();
jsTest.log("DONE test " + test);
}
})();
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