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//
// Tests mongos's failure tolerance for single-node shards
//
// Sets up a cluster with three shards, the first shard of which has an unsharded collection and
// half a sharded collection. The second shard has the second half of the sharded collection, and
// the third shard has nothing. Progressively shuts down each shard to see the impact on the
// cluster.
//
// Three different connection states are tested - active (connection is active through whole
// sequence), idle (connection is connected but not used before a shard change), and new
// (connection connected after shard change).
//
(function() {
'use strict';
var st = new ShardingTest({shards: 3, mongos: 1});
var admin = st.s0.getDB("admin");
var collSharded = st.s0.getCollection("fooSharded.barSharded");
var collUnsharded = st.s0.getCollection("fooUnsharded.barUnsharded");
assert.commandWorked(admin.runCommand({enableSharding: collSharded.getDB().toString()}));
st.ensurePrimaryShard(collSharded.getDB().toString(), st.shard0.shardName);
assert.commandWorked(
admin.runCommand({shardCollection: collSharded.toString(), key: {_id: 1}}));
assert.commandWorked(admin.runCommand({split: collSharded.toString(), middle: {_id: 0}}));
assert.commandWorked(admin.runCommand(
{moveChunk: collSharded.toString(), find: {_id: 0}, to: st.shard1.shardName}));
// Create the unsharded database
assert.writeOK(collUnsharded.insert({some: "doc"}));
assert.writeOK(collUnsharded.remove({}));
assert.commandWorked(admin.runCommand(
{movePrimary: collUnsharded.getDB().toString(), to: st.shard0.shardName}));
//
// Setup is complete
//
jsTest.log("Inserting initial data...");
var mongosConnActive = new Mongo(st.s0.host);
var mongosConnIdle = null;
var mongosConnNew = null;
assert.writeOK(mongosConnActive.getCollection(collSharded.toString()).insert({_id: -1}));
assert.writeOK(mongosConnActive.getCollection(collSharded.toString()).insert({_id: 1}));
assert.writeOK(mongosConnActive.getCollection(collUnsharded.toString()).insert({_id: 1}));
jsTest.log("Stopping third shard...");
mongosConnIdle = new Mongo(st.s0.host);
MongoRunner.stopMongod(st.shard2);
jsTest.log("Testing active connection...");
assert.neq(null, mongosConnActive.getCollection(collSharded.toString()).findOne({_id: -1}));
assert.neq(null, mongosConnActive.getCollection(collSharded.toString()).findOne({_id: 1}));
assert.neq(null, mongosConnActive.getCollection(collUnsharded.toString()).findOne({_id: 1}));
assert.writeOK(mongosConnActive.getCollection(collSharded.toString()).insert({_id: -2}));
assert.writeOK(mongosConnActive.getCollection(collSharded.toString()).insert({_id: 2}));
assert.writeOK(mongosConnActive.getCollection(collUnsharded.toString()).insert({_id: 2}));
jsTest.log("Testing idle connection...");
assert.writeOK(mongosConnIdle.getCollection(collSharded.toString()).insert({_id: -3}));
assert.writeOK(mongosConnIdle.getCollection(collSharded.toString()).insert({_id: 3}));
assert.writeOK(mongosConnIdle.getCollection(collUnsharded.toString()).insert({_id: 3}));
assert.neq(null, mongosConnIdle.getCollection(collSharded.toString()).findOne({_id: -1}));
assert.neq(null, mongosConnIdle.getCollection(collSharded.toString()).findOne({_id: 1}));
assert.neq(null, mongosConnIdle.getCollection(collUnsharded.toString()).findOne({_id: 1}));
jsTest.log("Testing new connections...");
mongosConnNew = new Mongo(st.s0.host);
assert.neq(null, mongosConnNew.getCollection(collSharded.toString()).findOne({_id: -1}));
mongosConnNew = new Mongo(st.s0.host);
assert.neq(null, mongosConnNew.getCollection(collSharded.toString()).findOne({_id: 1}));
mongosConnNew = new Mongo(st.s0.host);
assert.neq(null, mongosConnNew.getCollection(collUnsharded.toString()).findOne({_id: 1}));
mongosConnNew = new Mongo(st.s0.host);
assert.writeOK(mongosConnNew.getCollection(collSharded.toString()).insert({_id: -4}));
mongosConnNew = new Mongo(st.s0.host);
assert.writeOK(mongosConnNew.getCollection(collSharded.toString()).insert({_id: 4}));
mongosConnNew = new Mongo(st.s0.host);
assert.writeOK(mongosConnNew.getCollection(collUnsharded.toString()).insert({_id: 4}));
gc(); // Clean up new connections
jsTest.log("Stopping second shard...");
mongosConnIdle = new Mongo(st.s0.host);
MongoRunner.stopMongod(st.shard1);
jsTest.log("Testing active connection...");
assert.neq(null, mongosConnActive.getCollection(collSharded.toString()).findOne({_id: -1}));
assert.neq(null, mongosConnActive.getCollection(collUnsharded.toString()).findOne({_id: 1}));
assert.writeOK(mongosConnActive.getCollection(collSharded.toString()).insert({_id: -5}));
assert.writeError(mongosConnActive.getCollection(collSharded.toString()).insert({_id: 5}));
assert.writeOK(mongosConnActive.getCollection(collUnsharded.toString()).insert({_id: 5}));
jsTest.log("Testing idle connection...");
assert.writeOK(mongosConnIdle.getCollection(collSharded.toString()).insert({_id: -6}));
assert.writeError(mongosConnIdle.getCollection(collSharded.toString()).insert({_id: 6}));
assert.writeOK(mongosConnIdle.getCollection(collUnsharded.toString()).insert({_id: 6}));
assert.neq(null, mongosConnIdle.getCollection(collSharded.toString()).findOne({_id: -1}));
assert.neq(null, mongosConnIdle.getCollection(collUnsharded.toString()).findOne({_id: 1}));
jsTest.log("Testing new connections...");
mongosConnNew = new Mongo(st.s0.host);
assert.neq(null, mongosConnNew.getCollection(collSharded.toString()).findOne({_id: -1}));
mongosConnNew = new Mongo(st.s0.host);
assert.neq(null, mongosConnNew.getCollection(collUnsharded.toString()).findOne({_id: 1}));
mongosConnNew = new Mongo(st.s0.host);
assert.writeOK(mongosConnNew.getCollection(collSharded.toString()).insert({_id: -7}));
mongosConnNew = new Mongo(st.s0.host);
assert.writeError(mongosConnNew.getCollection(collSharded.toString()).insert({_id: 7}));
mongosConnNew = new Mongo(st.s0.host);
assert.writeOK(mongosConnNew.getCollection(collUnsharded.toString()).insert({_id: 7}));
st.stop();
})();
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