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/**
* This file tests the top-chunk optimization logic in splitChunk command.
* Whenever a chunk is split, the shouldMigrate field should be set if the extreme chunk
* has only a single document, where extreme chunk is defined as the chunk containing
* either the upper or lower bound of the entire shard key space.
*/
var st = new ShardingTest({ shards: 1 });
st.stopBalancer();
var testDB = st.s.getDB('test');
testDB.adminCommand({ enableSharding: 'test' });
var callSplit = function(db, minKey, maxKey, splitPoints) {
var res = st.s.adminCommand({getShardVersion: "test.user"});
assert.commandWorked(res);
var shardVersion = [res.version, res.versionEpoch];
return db.runCommand({
splitChunk: 'test.user',
from: 'shard0000',
min: minKey,
max: maxKey,
keyPattern: { x: 1 },
splitKeys: splitPoints,
shardVersion: shardVersion,
});
};
var tests = [
//
// Lower extreme chunk tests.
//
// All chunks have 1 doc.
//
// Expected doc counts for new chunks:
// [ MinKey, -2 ): 1
// [ -2, -1 ): 1
// [ -1, 0): 1
//
function(db) {
var res = callSplit(db, { x: MinKey }, { x: 0 }, [{ x: -2 }, { x: -1 }]);
assert.commandWorked(res);
assert.neq(res.shouldMigrate, null, tojson(res));
assert(bsonWoCompare(res.shouldMigrate.min, { x: MinKey }) == 0, tojson(res.shouldMigrate.min));
assert(bsonWoCompare(res.shouldMigrate.max, { x: -2 }) == 0, tojson(res.shouldMigrate.max));
},
// One chunk has single doc, extreme doesn't.
//
// Expected doc counts for new chunks:
// [ MinKey, -1 ): 2
// [ -1, 0): 1
//
function(db) {
var res = callSplit(db, { x: MinKey }, { x: 0 }, [{ x: -1 }]);
assert.commandWorked(res);
assert.eq(res.shouldMigrate, null, tojson(res));
},
// Only extreme has single doc.
//
// Expected doc counts for new chunks:
// [ MinKey, -2 ): 1
// [ -2, 0): 2
//
function(db) {
var res = callSplit(db, { x: MinKey }, { x: 0 }, [{ x: -2 }]);
assert.commandWorked(res);
assert.neq(res.shouldMigrate, null, tojson(res));
assert(bsonWoCompare(res.shouldMigrate.min, { x: MinKey }) == 0, tojson(res.shouldMigrate.min));
assert(bsonWoCompare(res.shouldMigrate.max, { x: -2 }) == 0, tojson(res.shouldMigrate.max));
},
//
// Upper extreme chunk tests.
//
// All chunks have 1 doc.
//
// Expected doc counts for new chunks:
// [ 0, 1 ): 1
// [ 1, 2 ): 1
// [ 2, MaxKey): 1
//
function(db) {
var res = callSplit(db, { x: 0 }, { x: MaxKey }, [{ x: 1 }, { x: 2 }]);
assert.commandWorked(res);
assert.neq(res.shouldMigrate, null, tojson(res));
assert(bsonWoCompare(res.shouldMigrate.min, { x: 2 }) == 0, tojson(res.shouldMigrate.min));
assert(bsonWoCompare(res.shouldMigrate.max, { x: MaxKey }) == 0, tojson(res.shouldMigrate.max));
},
// One chunk has single doc, extreme doesn't.
//
// Expected doc counts for new chunks:
// [ 0, 1 ): 1
// [ 1, MaxKey): 2
//
function(db) {
var res = callSplit(db, { x: 0 }, { x: MaxKey }, [{ x: 1 }]);
assert.commandWorked(res);
assert.eq(res.shouldMigrate, null, tojson(res));
},
// Only extreme has single doc.
//
// Expected doc counts for new chunks:
// [ 0, 2 ): 2
// [ 2, MaxKey): 1
//
function(db) {
var res = callSplit(db, { x: 0 }, { x: MaxKey }, [{ x: 2 }]);
assert.commandWorked(res);
assert.neq(res.shouldMigrate, null, tojson(res));
assert(bsonWoCompare(res.shouldMigrate.min, { x: 2 }) == 0, tojson(res.shouldMigrate.min));
assert(bsonWoCompare(res.shouldMigrate.max, { x: MaxKey }) == 0, tojson(res.shouldMigrate.max));
},
];
tests.forEach(function(test) {
// setup
testDB.adminCommand({ shardCollection: 'test.user', key: { x: 1 }});
testDB.adminCommand({ split: 'test.user', middle: { x: 0 }});
for (var x = -3; x < 3; x++) {
testDB.user.insert({ x: x });
}
// run test
test(st.d0.getDB('admin'));
// teardown
testDB.user.drop();
});
st.stop();
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