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/**
* Util class for testing reshardCollection cmd.
*/
"use strict";
load("jstests/libs/uuid_util.js");
class ReshardCollectionCmdTest {
constructor(testConfig) {
assert(testConfig.st && testConfig.dbName && testConfig.collName &&
testConfig.numInitialDocs);
this._st = testConfig.st;
this._mongos = this._st.s0;
this._mongosConfig = this._mongos.getDB('config');
this._dbName = testConfig.dbName;
this._collName = testConfig.collName;
this._ns = this._dbName + "." + this._collName;
this._numInitialDocs = testConfig.numInitialDocs;
this._shardToRSMap = {};
this._shardToRSMap[this._st.shard0.shardName] = this._st.rs0;
this._shardToRSMap[this._st.shard1.shardName] = this._st.rs1;
this._shardIdToShardMap = {};
this._shardIdToShardMap[this._st.shard0.shardName] = this._st.shard0;
this._shardIdToShardMap[this._st.shard1.shardName] = this._st.shard1;
}
_getUUIDFromCollectionInfo(dbName, collName, collInfo) {
if (collInfo) {
return extractUUIDFromObject(collInfo.info.uuid);
}
const uuidObject = getUUIDFromListCollections(this._mongos.getDB(dbName), collName);
return extractUUIDFromObject(uuidObject);
}
_constructTemporaryReshardingCollName(dbName, collName, collInfo) {
const existingUUID = this._getUUIDFromCollectionInfo(dbName, collName, collInfo);
return 'system.resharding.' + existingUUID;
}
_getAllShardIdsFromExpectedChunks(expectedChunks) {
let shardIds = new Set();
expectedChunks.forEach(chunk => {
shardIds.add(chunk.recipientShardId);
});
return shardIds;
}
_verifyChunksMatchExpected(numExpectedChunks, presetExpectedChunks) {
let collEntry =
this._mongos.getDB('config').getCollection('collections').findOne({_id: this._ns});
let chunkQuery = {uuid: collEntry.uuid};
const reshardedChunks = this._mongosConfig.chunks.find(chunkQuery).toArray();
if (presetExpectedChunks) {
presetExpectedChunks.sort();
}
reshardedChunks.sort();
assert.eq(numExpectedChunks, reshardedChunks.length, tojson(reshardedChunks));
let shardChunkCounts = {};
let incChunkCount = key => {
if (shardChunkCounts.hasOwnProperty(key)) {
shardChunkCounts[key]++;
} else {
shardChunkCounts[key] = 1;
}
};
for (let i = 0; i < numExpectedChunks; i++) {
incChunkCount(reshardedChunks[i].shard);
// match exact chunk boundaries for presetExpectedChunks
if (presetExpectedChunks) {
assert.eq(presetExpectedChunks[i].recipientShardId, reshardedChunks[i].shard);
assert.eq(presetExpectedChunks[i].min, reshardedChunks[i].min);
assert.eq(presetExpectedChunks[i].max, reshardedChunks[i].max);
}
}
// if presetChunks not specified, we only assert that chunks counts are balanced across
// shards
if (!presetExpectedChunks) {
let maxDiff = 0;
let shards = Object.keys(shardChunkCounts);
shards.forEach(shard1 => {
shards.forEach(shard2 => {
let diff = Math.abs(shardChunkCounts[shard1] - shardChunkCounts[shard2]);
maxDiff = (diff > maxDiff) ? diff : maxDiff;
});
});
assert.lte(maxDiff, 1, tojson(reshardedChunks));
}
}
_verifyCollectionExistenceForConn(collName, expectedToExist, conn) {
const doesExist = Boolean(conn.getDB(this._dbName)[collName].exists());
assert.eq(doesExist, expectedToExist);
}
_verifyTemporaryReshardingCollectionExistsWithCorrectOptions(expectedRecipientShards) {
const originalCollInfo =
this._mongos.getDB(this._dbName).getCollectionInfos({name: this._collName})[0];
assert.neq(originalCollInfo, undefined);
const tempReshardingCollName = this._constructTemporaryReshardingCollName(
this._dbName, this._collName, originalCollInfo);
this._verifyCollectionExistenceForConn(tempReshardingCollName, false, this._mongos);
expectedRecipientShards.forEach(shardId => {
const rsPrimary = this._shardToRSMap[shardId].getPrimary();
this._verifyCollectionExistenceForConn(this._collName, true, rsPrimary);
this._verifyCollectionExistenceForConn(tempReshardingCollName, false, rsPrimary);
ShardedIndexUtil.assertIndexExistsOnShard(
this._shardIdToShardMap[shardId], this._dbName, this._collName, {newKey: 1});
});
}
_verifyAllShardingCollectionsRemoved(tempReshardingCollName) {
assert.eq(0, this._mongos.getDB(this._dbName)[tempReshardingCollName].find().itcount());
assert.eq(0, this._mongosConfig.reshardingOperations.find({ns: this._ns}).itcount());
assert.eq(
0, this._mongosConfig.collections.find({reshardingFields: {$exists: true}}).itcount());
assert.eq(0,
this._st.rs0.getPrimary()
.getDB('config')
.localReshardingOperations.donor.find({ns: this._ns})
.itcount());
assert.eq(0,
this._st.rs0.getPrimary()
.getDB('config')
.localReshardingOperations.recipient.find({ns: this._ns})
.itcount());
assert.eq(0,
this._st.rs1.getPrimary()
.getDB('config')
.localReshardingOperations.donor.find({ns: this._ns})
.itcount());
assert.eq(0,
this._st.rs1.getPrimary()
.getDB('config')
.localReshardingOperations.recipient.find({ns: this._ns})
.itcount());
}
_verifyTagsDocumentsAfterOperationCompletes(ns, shardKeyPattern) {
const tagsArr = this._mongos.getCollection('config.tags').find({ns: ns}).toArray();
for (let i = 0; i < tagsArr.length; ++i) {
assert.eq(Object.keys(tagsArr[i]["min"]), shardKeyPattern);
assert.eq(Object.keys(tagsArr[i]["max"]), shardKeyPattern);
}
}
assertReshardCollOkWithPreset(commandObj, presetReshardedChunks) {
assert.commandWorked(
this._mongos.adminCommand({shardCollection: this._ns, key: {oldKey: 1}}));
let bulk = this._mongos.getDB(this._dbName)
.getCollection(this._collName)
.initializeOrderedBulkOp();
for (let x = 0; x < this._numInitialDocs; x++) {
bulk.insert({oldKey: x, newKey: this._numInitialDocs - x});
}
assert.commandWorked(bulk.execute());
commandObj._presetReshardedChunks = presetReshardedChunks;
const tempReshardingCollName =
this._constructTemporaryReshardingCollName(this._dbName, this._collName);
assert.commandWorked(this._mongos.adminCommand(commandObj));
this._verifyTemporaryReshardingCollectionExistsWithCorrectOptions(
this._getAllShardIdsFromExpectedChunks(presetReshardedChunks));
this._verifyTagsDocumentsAfterOperationCompletes(this._ns, Object.keys(commandObj.key));
this._verifyChunksMatchExpected(presetReshardedChunks.length, presetReshardedChunks);
this._mongos.getDB(this._dbName)[this._collName].drop();
this._verifyAllShardingCollectionsRemoved(tempReshardingCollName);
}
/**
* Run reshardCollection and check the number of chunks is as expected.
* @param {Object} commandObj The reshardCollection cmd to execute.
* @param {Number} expectedChunkNum Number of chunks to have after reshardCollection.
* @param {Object[]} expectedChunks Expected chunk distribution after reshardCollection.
*/
assertReshardCollOk(commandObj, expectedChunkNum, expectedChunks) {
assert.commandWorked(
this._mongos.adminCommand({shardCollection: this._ns, key: {oldKey: 1}}));
let bulk = this._mongos.getDB(this._dbName)
.getCollection(this._collName)
.initializeOrderedBulkOp();
for (let x = 0; x < this._numInitialDocs; x++) {
bulk.insert({oldKey: x, newKey: this._numInitialDocs - x});
}
assert.commandWorked(bulk.execute());
const tempReshardingCollName =
this._constructTemporaryReshardingCollName(this._dbName, this._collName);
assert.commandWorked(this._mongos.adminCommand(commandObj));
if (expectedChunks) {
this._verifyTemporaryReshardingCollectionExistsWithCorrectOptions(
this._getAllShardIdsFromExpectedChunks(expectedChunks));
}
this._verifyTagsDocumentsAfterOperationCompletes(this._ns, Object.keys(commandObj.key));
this._verifyChunksMatchExpected(expectedChunkNum, expectedChunks);
this._mongos.getDB(this._dbName)[this._collName].drop();
this._verifyAllShardingCollectionsRemoved(tempReshardingCollName);
}
}
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