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// Test that you can shard with shard key that's only a prefix of an existing index.
//
// Part 1: Shard new collection on {num : 1} with an index on {num : 1, x : 1}.
// Test that you can split and move chunks around.
// Part 2: Test that adding an array value for x doesn't make it unusuable.
// Part 3: Shard new collection on {skey : 1} but with a longer index.
// Insert docs with same val for 'skey' but different vals for 'extra'.
// Move chunks around and check that [min,max) chunk boundaries are properly obeyed.
(function() {
'use strict';
var s = new ShardingTest({shards: 2});
var db = s.getDB("test");
var admin = s.getDB("admin");
var config = s.getDB("config");
var shards = config.shards.find().toArray();
var shard0 = new Mongo(shards[0].host);
var shard1 = new Mongo(shards[1].host);
assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', 'shard0001');
//******************Part 1********************
var coll = db.foo;
var longStr = 'a';
while (longStr.length < 1024 * 128) {
longStr += longStr;
}
var bulk = coll.initializeUnorderedBulkOp();
for (i = 0; i < 100; i++) {
bulk.insert({num: i, str: longStr});
bulk.insert({num: i + 100, x: i, str: longStr});
}
assert.writeOK(bulk.execute());
// no usable index yet, should throw
assert.throws(function() {
s.adminCommand({shardCollection: coll.getFullName(), key: {num: 1}});
});
// create usable index
assert.commandWorked(coll.ensureIndex({num: 1, x: 1}));
// usable index, but doc with empty 'num' value, so still should throw
assert.writeOK(coll.insert({x: -5}));
assert.throws(function() {
s.adminCommand({shardCollection: coll.getFullName(), key: {num: 1}});
});
// remove the bad doc. now should finally succeed
assert.writeOK(coll.remove({x: -5}));
assert.commandWorked(s.s0.adminCommand({shardCollection: coll.getFullName(), key: {num: 1}}));
// make sure extra index is not created
assert.eq(2, coll.getIndexes().length);
// make sure balancing happens
s.awaitBalance(coll.getName(), db.getName());
// Make sure our initial balance cleanup doesn't interfere with later migrations.
assert.soon(function() {
print("Waiting for migration cleanup to occur...");
return coll.count() == coll.find().itcount();
});
s.stopBalancer();
// test splitting
assert.commandWorked(s.s0.adminCommand({split: coll.getFullName(), middle: {num: 50}}));
// test moving
assert.commandWorked(s.s0.adminCommand({
movechunk: coll.getFullName(),
find: {num: 20},
to: s.getOther(s.getPrimaryShard("test")).name,
_waitForDelete: true
}));
//******************Part 2********************
// Migrations and splits will still work on a sharded collection that only has multi key
// index.
db.user.ensureIndex({num: 1, x: 1});
db.adminCommand({shardCollection: 'test.user', key: {num: 1}});
var indexCount = db.user.getIndexes().length;
assert.eq(2,
indexCount, // indexes for _id_ and num_1_x_1
'index count not expected: ' + tojson(db.user.getIndexes()));
var array = [];
for (var item = 0; item < 50; item++) {
array.push(item);
}
for (var docs = 0; docs < 1000; docs++) {
db.user.insert({num: docs, x: array});
}
assert.eq(1000, db.user.find().itcount());
assert.commandWorked(admin.runCommand({
movechunk: 'test.user',
find: {num: 70},
to: s.getOther(s.getPrimaryShard("test")).name,
_waitForDelete: true
}));
var expectedShardCount = {shard0000: 0, shard0001: 0};
config.chunks.find({ns: 'test.user'}).forEach(function(chunkDoc) {
var min = chunkDoc.min.num;
var max = chunkDoc.max.num;
if (min < 0 || min == MinKey) {
min = 0;
}
if (max > 1000 || max == MaxKey) {
max = 1000;
}
if (max > 0) {
expectedShardCount[chunkDoc.shard] += (max - min);
}
});
assert.eq(expectedShardCount['shard0000'], shard0.getDB('test').user.find().count());
assert.eq(expectedShardCount['shard0001'], shard1.getDB('test').user.find().count());
assert.commandWorked(admin.runCommand({split: 'test.user', middle: {num: 70}}));
assert.eq(expectedShardCount['shard0000'], shard0.getDB('test').user.find().count());
assert.eq(expectedShardCount['shard0001'], shard1.getDB('test').user.find().count());
//******************Part 3********************
// Check chunk boundaries obeyed when using prefix shard key.
// This test repeats with shard key as the prefix of different longer indices.
for (i = 0; i < 3; i++) {
// setup new collection on shard0
var coll2 = db.foo2;
coll2.drop();
if (s.getPrimaryShardIdForDatabase(coll2.getDB()) != shards[0]._id) {
var moveRes = admin.runCommand({movePrimary: coll2.getDB() + "", to: shards[0]._id});
assert.eq(moveRes.ok, 1, "primary not moved correctly");
}
// declare a longer index
if (i == 0) {
assert.commandWorked(coll2.ensureIndex({skey: 1, extra: 1}));
} else if (i == 1) {
assert.commandWorked(coll2.ensureIndex({skey: 1, extra: -1}));
} else if (i == 2) {
assert.commandWorked(coll2.ensureIndex({skey: 1, extra: 1, superfluous: -1}));
}
// then shard collection on prefix
var shardRes = admin.runCommand({shardCollection: coll2 + "", key: {skey: 1}});
assert.eq(shardRes.ok, 1, "collection not sharded");
// insert docs with same value for skey
bulk = coll2.initializeUnorderedBulkOp();
for (var i = 0; i < 5; i++) {
for (var j = 0; j < 5; j++) {
bulk.insert({skey: 0, extra: i, superfluous: j});
}
}
assert.writeOK(bulk.execute());
// split on that key, and check it makes 2 chunks
var splitRes = admin.runCommand({split: coll2 + "", middle: {skey: 0}});
assert.eq(splitRes.ok, 1, "split didn't work");
assert.eq(config.chunks.find({ns: coll2.getFullName()}).count(), 2);
// movechunk should move ALL docs since they have same value for skey
moveRes = admin.runCommand(
{moveChunk: coll2 + "", find: {skey: 0}, to: shards[1]._id, _waitForDelete: true});
assert.eq(moveRes.ok, 1, "movechunk didn't work");
// Make sure our migration eventually goes through before testing individual shards
assert.soon(function() {
print("Waiting for migration cleanup to occur...");
return coll2.count() == coll2.find().itcount();
});
// check no orphaned docs on the shards
assert.eq(0, shard0.getCollection(coll2 + "").find().itcount());
assert.eq(25, shard1.getCollection(coll2 + "").find().itcount());
// and check total
assert.eq(25, coll2.find().itcount(), "bad total number of docs after move");
s.printShardingStatus();
}
s.stop();
})();
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