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/**
* Tests the shard version protocol on secondaries with causal consistency. A secondary request with
* read concern level 'available' and afterClusterTime specified should error because they ensure
* contradictory things. A secondary request with afterClusterTime specified and no read concern
* level should default to 'local' read concern level, using the shard version protocol.
*/
(function() {
"use strict";
load('jstests/libs/profiler.js'); // for profilerHasSingleMatchingEntryOrThrow()
// Set the secondaries to priority 0 and votes 0 to prevent the primaries from stepping down.
let rsOpts = {nodes: [{rsConfig: {votes: 1}}, {rsConfig: {priority: 0, votes: 0}}]};
let st =
new ShardingTest({mongos: 2, shards: {rs0: rsOpts, rs1: rsOpts}, causallyConsistent: true});
let dbName = 'test', collName = 'foo', ns = 'test.foo';
assert.commandWorked(st.s0.adminCommand({enableSharding: dbName}));
st.ensurePrimaryShard(dbName, st.shard0.shardName);
assert.commandWorked(st.s0.adminCommand({shardCollection: ns, key: {x: 1}}));
assert.commandWorked(st.s0.adminCommand({split: ns, middle: {x: 0}}));
let freshMongos = st.s0;
let staleMongos = st.s1;
jsTest.log("do insert from stale mongos to make it load the routing table before the move");
assert.writeOK(staleMongos.getCollection(ns).insert({x: 1}));
jsTest.log("do moveChunk from fresh mongos");
assert.commandWorked(freshMongos.adminCommand({
moveChunk: ns,
find: {x: 0},
to: st.shard1.shardName,
secondaryThrottle: true,
_waitForDelete: true,
writeConcern: {w: 2},
}));
// Turn on system profiler on secondaries to collect data on all future operations on the db.
let donorShardSecondary = st.rs0.getSecondary();
let recipientShardSecondary = st.rs1.getSecondary();
assert.commandWorked(donorShardSecondary.getDB(dbName).setProfilingLevel(2));
assert.commandWorked(recipientShardSecondary.getDB(dbName).setProfilingLevel(2));
// Note: this query will not be registered by the profiler because it errors before reaching the
// storage level.
jsTest.log("Do a secondary read from stale mongos with afterClusterTime and level 'available'");
const staleMongosDB = staleMongos.getDB(dbName);
assert.commandFailedWithCode(staleMongosDB.runCommand({
count: collName,
query: {x: 1},
$readPreference: {mode: "secondary"},
readConcern:
{'afterClusterTime': staleMongosDB.getSession().getOperationTime(), 'level': 'available'}
}),
ErrorCodes.InvalidOptions);
jsTest.log("Do a secondary read from stale mongos with afterClusterTime and no level");
let res = staleMongosDB.runCommand({
count: collName,
query: {x: 1},
$readPreference: {mode: "secondary"},
readConcern: {'afterClusterTime': staleMongosDB.getSession().getOperationTime()},
});
assert(res.ok);
assert.eq(1, res.n, tojson(res));
// The stale mongos will first go to the donor shard and receive a stale shard version,
// prompting the stale mongos to refresh it's routing table and retarget to the recipient shard.
profilerHasSingleMatchingEntryOrThrow({
profileDB: donorShardSecondary.getDB(dbName),
filter: {
"ns": ns,
"command.count": collName,
"command.query": {x: 1},
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern.afterClusterTime": {"$exists": true},
"errCode": ErrorCodes.StaleConfig
}
});
// The recipient shard will then return a stale shard version error because it needs to refresh
// its own routing table.
profilerHasSingleMatchingEntryOrThrow({
profileDB: recipientShardSecondary.getDB(dbName),
filter: {
"ns": ns,
"command.count": collName,
"command.query": {x: 1},
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern.afterClusterTime": {"$exists": true},
"errCode": ErrorCodes.StaleConfig
}
});
// Finally, the command is retried on the recipient shard and succeeds.
profilerHasSingleMatchingEntryOrThrow({
profileDB: recipientShardSecondary.getDB(dbName),
filter: {
"ns": ns,
"command.count": collName,
"command.query": {x: 1},
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern.afterClusterTime": {"$exists": true},
"errCode": {"$exists": false}
}
});
st.stop();
})();
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