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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.
// @tags: [requires_persistence]
//
// Run through the same test twice, once with a hard -9 kill, once with a regular shutdown
for (var test = 0; test < 2; test++) {
var killWith = (test == 0 ? 15 : 9);
var st = new ShardingTest({shards: 2, mongos: 1});
// Stop balancer to eliminate weird conn stuff
st.stopBalancer();
var mongos = st.s0;
var coll = mongos.getCollection("foo.bar");
var db = coll.getDB();
// Test is not valid for Win32
var is32Bits = (db.serverBuildInfo().bits == 32);
if (is32Bits && _isWindows()) {
// Win32 doesn't provide the polling interface we need to implement the check tested here
jsTest.log("Test is not valid on Win32 platform.");
} else {
// Non-Win32 platform
assert.writeOK(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] = null;
}
// Make sure we return connections back to the pool
gc();
// Don't make test fragile by linking to format of shardConnPoolStats, but this is useful if
// something goes wrong.
var connPoolStats = mongos.getDB("admin").runCommand({shardConnPoolStats: 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);
MongoRunner.stopMongod(st.shard0, killWith);
jsTest.log("Restart shard...");
st.shard0 = MongoRunner.runMongod({restart: st.shard0, forceLock: 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);
} // End Win32 check
st.stop();
jsTest.log("DONE test " + test);
} // End test loop
jsTest.log("DONE!");
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