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// Test to verify that latency metrics are collected in both currentOp and cumulativeOp
// during resharding.
//
// @tags: [
// uses_atclustertime,
// ]
//
(function() {
'use strict';
load('jstests/libs/discover_topology.js');
load('jstests/sharding/libs/resharding_test_fixture.js');
const reshardingTest = new ReshardingTest({numDonors: 2, numRecipients: 2, reshardInPlace: true});
reshardingTest.setup();
const kOplogApplierApplyBatchLatencyMillis = "oplogApplierApplyBatchLatencyMillis";
const kCollClonerFillBatchForInsertLatencyMillis = "collClonerFillBatchForInsertLatencyMillis";
const kDocumentsCopied = "documentsCopied";
const kDbName = "reshardingDb";
const collName = "coll";
const ns = kDbName + "." + collName;
const donorShardNames = reshardingTest.donorShardNames;
const testColl = reshardingTest.createShardedCollection({
ns: ns,
shardKeyPattern: {x: 1, s: 1},
chunks: [
{min: {x: MinKey, s: MinKey}, max: {x: 5, s: 5}, shard: donorShardNames[0]},
{min: {x: 5, s: 5}, max: {x: MaxKey, s: MaxKey}, shard: donorShardNames[1]},
],
});
function setParameter(conn, field, value) {
var cmd = {setParameter: 1};
cmd[field] = value;
return conn.adminCommand(cmd);
}
function getCumulativeOpReport(mongo) {
const stats = mongo.getDB('admin').serverStatus({});
assert(stats.hasOwnProperty('shardingStatistics'), stats);
const shardingStats = stats.shardingStatistics;
assert(shardingStats.hasOwnProperty('resharding'),
`Missing resharding section in ${tojson(shardingStats)}`);
return shardingStats.resharding;
}
function getCurrentOpReport(mongo, role) {
return mongo.getDB("admin").currentOp(
{ns: ns, desc: {$regex: 'Resharding' + role + 'Service.*'}});
}
function getReshardingMetricsReport(mongo, role) {
if (role === "Cumulative") {
return getCumulativeOpReport(mongo);
} else {
const report = getCurrentOpReport(mongo, role);
assert(report.inprog.length === 1,
`expected report.inprog.length === 1,
instead found ${report.inprog.length}`);
return report.inprog[0];
}
}
const mongos = testColl.getMongo();
const topology = DiscoverTopology.findConnectedNodes(mongos);
const recipientShardNames = reshardingTest.recipientShardNames;
recipientShardNames.forEach(function(shardName) {
const mongo = new Mongo(topology.shards[shardName].primary);
// Batches from resharding::data_copy::fillBatchForInsert are filled with documents
// until a document pushes the batch over the expected size. Setting the server
// parameter 'reshardingCollectionClonerBatchSizeInBytes' to the minimum value of 1
// ensures that the first document added to the batch will exceed this value, forcing
// every batch to contain only 1 document.
assert.commandWorked(setParameter(mongo, "reshardingCollectionClonerBatchSizeInBytes", 1));
});
const docsToInsertBeforeResharding = [
{_id: 1, x: 0, s: 6, y: 0}, // Stays on shard0.
{_id: 2, x: 0, s: 0, y: 6}, // Moves to shard1.
{_id: 3, x: 6, s: 6, y: 0}, // Moves to shard0.
{_id: 4, x: 6, s: 0, y: 6}, // Stays on shard1.
];
const docsToInsertDuringResharding = [
{_id: 5, x: 0, s: 6, y: 0}, // Stays on shard0.
{_id: 6, x: 0, s: 0, y: 6}, // Moves to shard1.
{_id: 7, x: 6, s: 6, y: 0}, // Moves to shard0.
{_id: 8, x: 6, s: 0, y: 6}, // Stays on shard1.
];
assert.commandWorked(testColl.insertMany(docsToInsertBeforeResharding));
// First test that histogram metrics appear in currentOp.
let firstReshardBatchApplies = 0;
reshardingTest.withReshardingInBackground(
{
newShardKeyPattern: {y: 1, s: 1},
newChunks: [
{min: {y: MinKey, s: MinKey}, max: {y: 5, s: 5}, shard: recipientShardNames[0]},
{min: {y: 5, s: 5}, max: {y: MaxKey, s: MaxKey}, shard: recipientShardNames[1]},
],
},
() => {
reshardingTest.awaitCloneTimestampChosen();
assert.commandWorked(testColl.insertMany(docsToInsertDuringResharding));
},
{
postCheckConsistencyFn: () => {
recipientShardNames.forEach(function(shardName) {
const mongo = new Mongo(topology.shards[shardName].primary);
const reshardingMetrics = getReshardingMetricsReport(mongo, "Recipient");
const oplogApplierApplyBatchHist =
reshardingMetrics[kOplogApplierApplyBatchLatencyMillis];
const collClonerFillBatchForInsertHist =
reshardingMetrics[kCollClonerFillBatchForInsertLatencyMillis];
// We expect 1 batch insert per document on each shard, plus 1 empty batch
// to discover no documents are left.
const expectedBatchInserts = reshardingMetrics[kDocumentsCopied] + 1;
const receivedBatchInserts = collClonerFillBatchForInsertHist["totalCount"];
assert(expectedBatchInserts == receivedBatchInserts,
`expected ${expectedBatchInserts} batch inserts,
received ${receivedBatchInserts}`);
firstReshardBatchApplies += oplogApplierApplyBatchHist["totalCount"];
});
assert(firstReshardBatchApplies > 0,
`Expected greater than 0 recorded batch applies,
got ${firstReshardBatchApplies} instead.`);
}
});
// Next test that histogram metrics accumulate in cumulativeOp.
const collName_2 = "coll2";
const ns_2 = kDbName + "." + collName_2;
const testColl_2 = reshardingTest.createShardedCollection({
ns: ns_2,
shardKeyPattern: {x: 1, s: 1},
chunks: [
{min: {x: MinKey, s: MinKey}, max: {x: 5, s: 5}, shard: donorShardNames[0]},
{min: {x: 5, s: 5}, max: {x: MaxKey, s: MaxKey}, shard: donorShardNames[1]},
],
});
assert.commandWorked(testColl_2.insertMany(docsToInsertBeforeResharding));
reshardingTest.withReshardingInBackground(
{
newShardKeyPattern: {y: 1, s: 1},
newChunks: [
{min: {y: MinKey, s: MinKey}, max: {y: 5, s: 5}, shard: recipientShardNames[0]},
{min: {y: 5, s: 5}, max: {y: MaxKey, s: MaxKey}, shard: recipientShardNames[1]},
],
},
() => {
reshardingTest.awaitCloneTimestampChosen();
assert.commandWorked(testColl_2.insertMany(docsToInsertDuringResharding));
});
let cumulativeBatchApplies = 0;
let cumulativeBatchInserts = 0;
let totalDocumentsCopied = 0;
recipientShardNames.forEach(function(shardName) {
const mongo = new Mongo(topology.shards[shardName].primary);
const reshardingMetrics = getReshardingMetricsReport(mongo, "Cumulative");
const oplogApplierApplyBatchHist = reshardingMetrics[kOplogApplierApplyBatchLatencyMillis];
const collClonerFillBatchForInsertHist =
reshardingMetrics[kCollClonerFillBatchForInsertLatencyMillis];
cumulativeBatchApplies += oplogApplierApplyBatchHist["totalCount"];
cumulativeBatchInserts += collClonerFillBatchForInsertHist["totalCount"];
totalDocumentsCopied += reshardingMetrics[kDocumentsCopied];
});
// We expect the cumulative number of batch inserts to be equal to the total number of documents
// copied during cloning plus one empty batch for each recipient for both resharding operations.
const expectedCumulativeBatchInserts = totalDocumentsCopied + 2 * recipientShardNames.length;
assert(cumulativeBatchApplies > firstReshardBatchApplies, `Expected batch oplog applies
to accumluate. Instead found ${cumulativeBatchApplies} cumulative applies,
compared to ${firstReshardBatchApplies} from first reshard operation.`);
assert(cumulativeBatchInserts == expectedCumulativeBatchInserts, `Expected
${expectedCumulativeBatchInserts} cumulative batch inserts. Instead found
${cumulativeBatchInserts}`);
reshardingTest.teardown();
})();
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