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/**
* Verifies that scaling is applied after summing the statistics together from individual shards.
*/
(function() {
"use strict";
const dbName = "test";
const collName = "scaled_collection_stats";
const ns = dbName + "." + collName;
const st = new ShardingTest({shards: 2});
jsTest.log("Insert some data.");
const coll = st.s0.getDB(dbName)[collName];
let bulk = coll.initializeUnorderedBulkOp();
for (let i = -50; i < 50; i++) {
bulk.insert({_id: i});
}
assert.commandWorked(bulk.execute());
jsTest.log("Create a sharded collection with one chunk on each of the two shards.");
st.ensurePrimaryShard(dbName, st.shard0.shardName);
assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
assert.commandWorked(st.s.adminCommand({shardCollection: ns, key: {_id: 1}}));
assert.commandWorked(st.s.adminCommand({split: ns, middle: {_id: 0}}));
assert.commandWorked(st.s.adminCommand(
{moveChunk: ns, find: {_id: 0}, to: st.shard1.shardName, _waitForDelete: true}));
// Determine the unscaled index size.
let res = assert.commandWorked(coll.stats());
const totalIndexSize = res.totalIndexSize;
assert(res.sharded);
assert.eq(2, res.nchunks);
assert.commandFailed(coll.stats(-1));
assert.commandFailed(coll.stats(0));
assert.commandFailed(coll.stats(0.99));
// Verify that the scaling is applied after summing the statistics together from individual shards.
res = assert.commandWorked(coll.stats(totalIndexSize));
// Scaling was applied before summing the individual shard statistics together making it
// less accurate as the statistics are represented as integers using the floor() function. Now that
// the individual shard statistics are summed together before any scaling is applied, we see more
// accuracy.
assert.eq(1, res.totalIndexSize);
st.stop();
}());
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