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/**
* Tests that a stale mongos does not return a stale shardVersion error to the client for explain
* find sent using the legacy query mode (it retries on the stale shardVersion error internally).
*/
(function() {
"use strict";
const dbName = "test";
const collName = "foo";
const ns = dbName + "." + collName;
const st = new ShardingTest({mongos: 2, shards: 1, verbose: 2});
let staleMongos = st.s0;
let freshMongos = st.s1;
jsTest.log("Make the stale mongos load a cache entry for db " + dbName + " once");
assert.writeOK(staleMongos.getDB(dbName).getCollection(collName).insert({_id: 1}));
jsTest.log("Call shardCollection on " + ns + " from the fresh mongos");
assert.commandWorked(freshMongos.adminCommand({enableSharding: dbName}));
assert.commandWorked(freshMongos.adminCommand({shardCollection: ns, key: {"_id": 1}}));
jsTest.log("Ensure the shard knows " + ns + " is sharded");
assert.commandWorked(
st.shard0.adminCommand({_flushRoutingTableCacheUpdates: ns, syncFromConfig: true}));
jsTest.log("Run explain find on " + ns + " from the stale mongos");
staleMongos.getDB(dbName).getMongo().forceReadMode("legacy");
staleMongos.getDB(dbName).getCollection(collName).find({$query: {}, $explain: true}).next();
st.stop();
})();
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