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(function() {
'use strict';
var s = new ShardingTest({shards: 2, mongos: 1, other: {chunkSize: 1, enableAutoSplit: true}});
assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', s.shard1.shardName);
assert.commandWorked(s.s0.adminCommand({shardcollection: "test.foo", key: {x: 1}}));
var db = s.getDB("test");
const big = 'X'.repeat(1024 * 1024); // 1MB
// Insert 3MB of documents to create a jumbo chunk, and use the same shard key in all of
// them so that the chunk cannot be split.
var x = 0;
var bulk = db.foo.initializeUnorderedBulkOp();
for (var i = 0; i < 3; i++) {
bulk.insert({x: x, big: big});
}
// Create documents with different shard keys that can be split and moved without issue.
for (; x < 20; x++) {
bulk.insert({x: x, big: big});
}
assert.writeOK(bulk.execute());
s.printShardingStatus(true);
s.startBalancer();
assert.soon(() => {
// Check that the jumbo chunk did not move, which shouldn't be possible, and that the jumbo
// flag
// has been added.
var jumboChunk = s.getDB('config').chunks.findOne(
{ns: 'test.foo', min: {$lte: {x: 0}}, max: {$gt: {x: 0}}});
assert.eq(s.shard1.shardName,
jumboChunk.shard,
'jumbo chunk ' + tojson(jumboChunk) + ' was moved');
return jumboChunk.jumbo;
});
// TODO: SERVER-26531 Make sure that balancer marked the first chunk as jumbo.
// Assumption: balancer favors moving the lowest valued chunk out of a shard.
// assert(jumboChunk.jumbo, tojson(jumboChunk));
s.stop();
})();
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