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'use strict';
var RoutingTableConsistencyChecker = (function() {
const sameObjectFields = (lhsObjFields, rhsObjFields) => {
if (lhsObjFields.length !== rhsObjFields.length) {
return false;
}
for (let i = 0; i != lhsObjFields.length; ++i) {
if (lhsObjFields[i] !== rhsObjFields[i]) {
return false;
}
}
return true;
};
const fetchRoutingTableData = (mongos) => {
// Group docs in config.chunks by coll UUID (sorting by minKey),
// then join with docs in config.collections.
// NOTE: the query may throw an exception if the collected data size is bigger than 16MB.
// To skip the execution of the hook, set the `TestData.skipCheckRoutingTableConsistency`
// flag in the failing test.
return mongos.getDB('config')
.chunks
.aggregate([
{$sort: {min: 1}},
{
$group: {
_id: '$uuid',
routingTable: {$push: '$$ROOT'},
}
},
{$lookup: {
from: 'collections',
localField: '_id',
foreignField: 'uuid',
as: 'details'
},
}
])
.toArray();
};
const checkCollRoutingTable = (nss, shardKeyPattern, routingTable) => {
if (!routingTable) {
jsTest.log(`config.collections entry '${nss}' has no chunks`);
return false;
}
const shardKeyfields = Object.keys(shardKeyPattern);
let lastLowerBound = {};
for (const key of shardKeyfields) {
lastLowerBound[key] = MinKey;
}
let expectedLastBound = {};
for (const key of shardKeyfields) {
expectedLastBound[key] = MaxKey;
}
for (const chunk of routingTable) {
if (!sameObjectFields(Object.keys(chunk.min), shardKeyfields) ||
!sameObjectFields(Object.keys(chunk.max), shardKeyfields)) {
jsTest.log(`Shard key pattern violation found in config.chunks for ${
nss}! Expected: ${tojson(shardKeyPattern)}, found chunk ${tojson(chunk)}`);
return false;
}
if (bsonWoCompare(chunk.min, lastLowerBound) !== 0) {
jsTest.log(`Found gap or range overlap in config.chunks for collection ${
nss}, chunk ${tojson(chunk._id)}! Expected ${tojson(lastLowerBound)}, found ${
tojson(chunk.min)}`);
return false;
}
lastLowerBound = chunk.max;
}
if (bsonWoCompare(routingTable[routingTable.length - 1].max, expectedLastBound) !== 0) {
jsTest.log(
`Incomplete range key detected in config.chunks for ${nss} (MaxKey missing)`);
return false;
}
jsTest.log(`${nss} with ${routingTable.length} chunks passed the check`);
return true;
};
const run = (mongos) => {
try {
jsTest.log('Checking routing table consistency');
// Group docs in config.chunks by coll UUID (sorting by minKey),
// then join with docs in config.collections.
const testCollectionsWithRoutingTable = fetchRoutingTableData(mongos);
for (const collData of testCollectionsWithRoutingTable) {
// Test invariant
assert.lte(
1,
collData.details.length,
'Possible bug in aggregation generating testCollectionsWithRoutingTable');
// Test checks
assert.eq(
1,
collData.details.length,
`Found entries in config.chunks with no match in config.collections! Details: ${
tojson(collData)}`);
assert(checkCollRoutingTable(
collData.details[0]._id, collData.details[0].key, collData.routingTable),
`Corrupted routing table detected for ${collData._id}! Details: ${
tojson(collData)}`);
}
} catch (e) {
if (e.code !== ErrorCodes.Unauthorized) {
throw e;
}
jsTest.log(
'Skipping check of routing table consistency - access to admin collections is not authorized');
}
jsTest.log('Routing table consistency check completed');
};
return {
run: run,
};
})();
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