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// Multiversion scenarios for explain.
var explain, testDb, coll, options, st;
//
// Standalone
//
// Ensure that a 2.8 shell can explain .find() against a 2.6 mongod
var mongod26 = MongoRunner.runMongod({binVersion: "2.6"});
testDb = mongod26.getDB("explain-multiversion");
testDb.dropDatabase();
coll = testDb.standalone;
coll.drop();
coll.insert({_id: 1, a: 1});
// Make sure that we get the expected 2.6-style explain.
explain = coll.find().explain();
assert.eq(explain.cursor, "BasicCursor");
assert.eq(explain.n, 1);
// Also test the new .explain.find().finish() style.
explain = coll.explain().find().finish();
assert.eq(explain.cursor, "BasicCursor");
assert.eq(explain.n, 1);
MongoRunner.stopMongod(mongod26.port);
//
// Sharded cluster
// --2.6 mongos
// --2.6 config
// --two shards, both version 2.6
//
options = {
sync: true, // Old clusters can't use replsets for config servers
mongosOptions: {binVersion: "2.6"},
configOptions: {binVersion: "2.6"},
shardOptions: {binVersion: "2.6"}
}
st = new ShardingTest({shards: 2, other: options});
testDb = st.s.getDB("explain-multiversion");
testDb.dropDatabase();
coll = testDb.standalone;
coll.drop();
assert.commandWorked(testDb.adminCommand({enableSharding: testDb.getName()}));
testDb.adminCommand({shardCollection: coll.getFullName(), key: {_id: 1}});
coll.insert({_id: 1, a: 1});
// Ensure that explain gives us 2.6-style sharded output.
explain = coll.find().explain();
assert("clusteredType" in explain);
assert("shards" in explain);
assert.eq(explain.n, 1);
assert.gte(explain.nscanned, 1);
assert.gte(explain.nscannedObjects, 1);
// Also test .explain().find().finish() syntax.
explain = coll.explain().find().finish();
assert("clusteredType" in explain);
assert("shards" in explain);
assert.eq(explain.n, 1);
assert.gte(explain.nscanned, 1);
assert.gte(explain.nscannedObjects, 1);
st.stop();
//
// Sharded cluster
// --2.8 mongos
// --2.8 config
// --two shards, both 2.6
//
options = {
sync: true, // Mixed version clusters can't use replsets for config servers
mongosOptions: {binVersion: "2.8"},
configOptions: {binVersion: "2.8"},
shardOptions: {binVersion: "2.6"}
}
st = new ShardingTest({shards: 2, other: options});
testDb = st.s.getDB("explain-multiversion");
testDb.dropDatabase();
coll = testDb.standalone;
coll.drop();
assert.commandWorked(testDb.adminCommand({enableSharding: testDb.getName()}));
testDb.adminCommand({shardCollection: coll.getFullName(), key: {_id: 1}});
coll.insert({_id: 1, a: 1});
// Ensure that explain gives us 2.6-style sharded output.
explain = coll.find().explain();
assert("clusteredType" in explain);
assert("shards" in explain);
assert.eq(explain.n, 1);
assert.gte(explain.nscanned, 1);
assert.gte(explain.nscannedObjects, 1);
// Also test .explain().find().finish() syntax.
explain = coll.explain().find().finish();
assert("clusteredType" in explain);
assert("shards" in explain);
assert.eq(explain.n, 1);
assert.gte(explain.nscanned, 1);
assert.gte(explain.nscannedObjects, 1);
st.stop();
//
// Sharded cluster
// --2.8 mongos
// --2.8 config
// --two shards, one 2.6 and one 2.8
//
options = {
sync: true, // Mixed version clusters can't use replsets for config servers
mongosOptions: {binVersion: "2.8"},
configOptions: {binVersion: "2.8"},
shardOptions: {binVersion: ["2.6", "2.8"]}
}
st = new ShardingTest({shards: 2, other: options});
testDb = st.s.getDB("explain-multiversion");
testDb.dropDatabase();
coll = testDb.standalone;
coll.drop();
assert.commandWorked(testDb.adminCommand({enableSharding: testDb.getName()}));
var res = testDb.adminCommand({movePrimary: testDb.getName(), to: 'shard0001'});
assert(res.ok || res.errmsg == "it is already the primary");
testDb.adminCommand({shardCollection: coll.getFullName(), key: {_id: 1}});
// Disable the balancer and pre-split in order to ensure chunks on both shards.
st.stopBalancer();
assert.commandWorked(testDb.adminCommand({split: coll.getFullName(), middle: {_id: 5}}));
assert.commandWorked(testDb.adminCommand({moveChunk: coll.getFullName(),
find: {_id: 5},
to: "shard0000"}));
coll.insert({_id: 1});
coll.insert({_id: 10});
// Explain should aggregate mixed-version output in a 2.6-style way.
explain = coll.find().explain();
assert("clusteredType" in explain);
assert("shards" in explain);
assert.eq(explain.n, 2);
assert.gte(explain.nscanned, 1);
assert.gte(explain.nscannedObjects, 1);
// Also test .explain().find().finish() syntax.
explain = coll.explain().find().finish();
assert("clusteredType" in explain);
assert("shards" in explain);
assert.eq(explain.n, 2);
assert.gte(explain.nscanned, 1);
assert.gte(explain.nscannedObjects, 1);
st.stop();
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