mongodb/jstests/sharding/zero_shard_version.js

/**
 * Tests the setShardVersion logic on the this shard side, specifically when comparing
 * against a major version of zero or incompatible epochs.
 */

var st = new ShardingTest({ shards: 2, mongos: 4 });
st.stopBalancer();

var testDB_s0 = st.s.getDB('test');
testDB_s0.adminCommand({ enableSharding: 'test' });
testDB_s0.adminCommand({ movePrimary: 'test', to: 'shard0001' });
testDB_s0.adminCommand({ shardCollection: 'test.user', key: { x: 1 }});

var checkShardMajorVersion = function(conn, expectedVersion) {
    var shardVersionInfo = conn.adminCommand({ getShardVersion: 'test.user' });
    assert.eq(expectedVersion, shardVersionInfo.global.getTime());
};

///////////////////////////////////////////////////////
// Test shard with empty chunk
// mongos versions: s0: 1|0|a

// shard0: 0|0|a
// shard1: 1|0|a, [-inf, inf)
// mongos0: 1|0|a

var testDB_s1 = st.s1.getDB('test');
assert.writeOK(testDB_s1.user.insert({ x: 1 }));
assert.commandWorked(testDB_s1.adminCommand({ moveChunk: 'test.user',
                                              find: { x: 0 },
                                              to: 'shard0000' }));

// Official config:
// shard0: 2|0|a, [-inf, inf)
// shard1: 0|0|a
//
// Shard metadata:
// shard0: 0|0|a
// shard1: 0|0|a
//
// mongos0: 1|0|a

checkShardMajorVersion(st.d0, 0);
checkShardMajorVersion(st.d1, 0);

// mongos0 still thinks that { x: 1 } belong to shard0001, but should be able to
// refresh it's metadata correctly.
assert.neq(null, testDB_s0.user.findOne({ x: 1 }));

checkShardMajorVersion(st.d0, 2);
checkShardMajorVersion(st.d1, 0);

// Set mongos2 & mongos3 to version 2|0|a
var testDB_s2 = st.s2.getDB('test');
assert.neq(null, testDB_s2.user.findOne({ x: 1 }));

var testDB_s3 = st.s3.getDB('test');
assert.neq(null, testDB_s3.user.findOne({ x: 1 }));

///////////////////////////////////////////////////////
// Test unsharded collection
// mongos versions: s0, s2, s3: 2|0|a

testDB_s1.user.drop();
assert.writeOK(testDB_s1.user.insert({ x: 10 }));

// shard0: 0|0|0
// shard1: 0|0|0
// mongos0: 2|0|a

checkShardMajorVersion(st.d0, 0);
checkShardMajorVersion(st.d1, 0);

// mongos0 still thinks { x: 10 } belong to shard0000, but since coll is dropped,
// query should be routed to primary shard.
assert.neq(null, testDB_s0.user.findOne({ x: 10 }));

checkShardMajorVersion(st.d0, 0);
checkShardMajorVersion(st.d1, 0);

///////////////////////////////////////////////////////
// Test 2 shards with 1 chunk
// mongos versions: s0: 0|0|0, s2, s3: 2|0|a

testDB_s1.user.drop();
testDB_s1.adminCommand({ shardCollection: 'test.user', key: { x: 1 }});
testDB_s1.adminCommand({ split: 'test.user', middle: { x: 0 }});

// shard0: 0|0|b,
// shard1: 1|1|b, [-inf, 0), [0, inf)

testDB_s1.user.insert({ x: 1 });
testDB_s1.user.insert({ x: -11 });
assert.commandWorked(testDB_s1.adminCommand({ moveChunk: 'test.user',
                                              find: { x: -1 },
                                              to: 'shard0000' }));

// Official config:
// shard0: 2|0|b, [-inf, 0)
// shard1: 2|1|b, [0, inf)
//
// Shard metadata:
// shard0: 0|0|b
// shard1: 2|1|b
//
// mongos2: 2|0|a

checkShardMajorVersion(st.d0, 0);
checkShardMajorVersion(st.d1, 2);

// mongos2 still thinks that { x: 1 } belong to shard0000, but should be able to
// refresh it's metadata correctly.
assert.neq(null, testDB_s2.user.findOne({ x: 1 }));

checkShardMajorVersion(st.d0, 0);
checkShardMajorVersion(st.d1, 2);

// Set shard metadata to 2|0|b
assert.neq(null, testDB_s2.user.findOne({ x: -11 }));

checkShardMajorVersion(st.d0, 2);
checkShardMajorVersion(st.d1, 2);

// Official config:
// shard0: 2|0|b, [-inf, 0)
// shard1: 2|1|b, [0, inf)
//
// Shard metadata:
// shard0: 2|0|b
// shard1: 2|1|b
//
// mongos3: 2|0|a

// 4th mongos still thinks that { x: 1 } belong to shard0000, but should be able to
// refresh it's metadata correctly.
assert.neq(null, testDB_s3.user.findOne({ x: 1 }));

///////////////////////////////////////////////////////
// Test mongos thinks unsharded when it's actually sharded
// mongos current versions: s0: 0|0|0, s2, s3: 2|0|b

// Set mongos0 to version 0|0|0
testDB_s0.user.drop();

checkShardMajorVersion(st.d0, 0);
checkShardMajorVersion(st.d1, 0);

assert.eq(null, testDB_s0.user.findOne({ x: 1 }));

// Needs to also set mongos1 to version 0|0|0, otherwise it'll complain that collection is
// already sharded.
assert.eq(null, testDB_s1.user.findOne({ x: 1 }));
assert.commandWorked(testDB_s1.adminCommand({ shardCollection: 'test.user', key: { x: 1 }}));
testDB_s1.user.insert({ x: 1 });

assert.commandWorked(testDB_s1.adminCommand({ moveChunk: 'test.user',
                                              find: { x: 0 },
                                              to: 'shard0000' }));

// Official config:
// shard0: 2|0|c, [-inf, inf)
// shard1: 0|0|c
//
// Shard metadata:
// shard0: 0|0|c
// shard1: 0|0|c
//
// mongos0: 0|0|0

checkShardMajorVersion(st.d0, 0);
checkShardMajorVersion(st.d1, 0);

// 1st mongos thinks that collection is unshareded and will attempt to query primary shard.
assert.neq(null, testDB_s0.user.findOne({ x: 1 }));

checkShardMajorVersion(st.d0, 2);
checkShardMajorVersion(st.d1, 0);

st.stop();