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/**
* Perform tests for moveChunk and splitChunk commands when the shard key is compound hashed.
*
* @tags: [
* multiversion_incompatible,
* ]
*/
(function() {
'use strict';
load("jstests/sharding/libs/find_chunks_util.js");
const st = new ShardingTest({shards: 2, other: {chunkSize: 1}});
const configDB = st.s0.getDB('config');
assert.commandWorked(configDB.adminCommand({enableSharding: 'test'}));
const shard0 = st.shard0.shardName;
const shard1 = st.shard1.shardName;
st.ensurePrimaryShard('test', shard0);
const testDBOnPrimary = st.rs0.getPrimary().getDB('test');
function verifyChunkSplitIntoTwo(namespace, chunk) {
assert.eq(
0, findChunksUtil.countChunksForNs(configDB, namespace, {min: chunk.min, max: chunk.max}));
assert.eq(1, findChunksUtil.countChunksForNs(configDB, namespace, {min: chunk.min}));
assert.eq(1, findChunksUtil.countChunksForNs(configDB, namespace, {max: chunk.max}));
}
const nonHashedFieldValue = 111;
const hashedFieldValue = convertShardKeyToHashed(nonHashedFieldValue);
/**
* Returns an object which has all the shard key fields. The hashed field will have the value
* provided for 'valueForHashedField'. We are doing this because, the 'bounds' and 'middle'
* parameters of splitChunk/moveChunk commands expect a hashed value for the hashed field, where as
* 'find' expect a non-hashed value.
*/
function buildObjWithAllShardKeyFields(shardKey, valueForHashedField) {
let splitObj = {};
for (let key in shardKey) {
if (shardKey[key] === "hashed") {
splitObj[key] = valueForHashedField;
} else {
splitObj[key] = 1;
}
}
return splitObj;
}
function testSplit(shardKey, collName) {
const namespace = testDBOnPrimary[collName].getFullName();
assert.commandWorked(configDB.adminCommand({shardCollection: namespace, key: shardKey}));
// Insert data since both 'find' and 'bounds' based split requires the chunk to contain some
// documents.
const bulk = st.s.getDB("test")[collName].initializeUnorderedBulkOp();
for (let x = -1200; x < 1200; x++) {
bulk.insert({x: x, y: x, z: x});
}
assert.commandWorked(bulk.execute());
// Attempt to split on a value that is not the shard key.
assert.commandFailed(configDB.adminCommand({split: namespace, middle: {someField: 100}}));
assert.commandFailed(configDB.adminCommand({split: namespace, find: {someField: 100}}));
assert.commandFailed(configDB.adminCommand(
{split: namespace, bounds: [{someField: MinKey}, {someField: MaxKey}]}));
let totalChunksBefore = findChunksUtil.countChunksForNs(configDB, namespace);
const lowestChunk =
findChunksUtil.findChunksByNs(configDB, namespace).sort({min: 1}).limit(1).next();
assert(lowestChunk);
// Split the chunk based on 'bounds' and verify total chunks increased by one.
assert.commandWorked(
configDB.adminCommand({split: namespace, bounds: [lowestChunk.min, lowestChunk.max]}));
assert.eq(++totalChunksBefore, findChunksUtil.countChunksForNs(configDB, namespace));
// Verify that a single chunk with the previous bounds no longer exists but split into two.
verifyChunkSplitIntoTwo(namespace, lowestChunk);
// Cannot split if 'min' and 'max' doesn't correspond to the same chunk.
assert.commandFailed(
configDB.adminCommand({split: namespace, bounds: [lowestChunk.min, lowestChunk.max]}));
const splitObjWithHashedValue = buildObjWithAllShardKeyFields(shardKey, hashedFieldValue);
// Find the chunk to which 'splitObjWithHashedValue' belongs to.
let chunkToBeSplit = findChunksUtil.findChunksByNs(
configDB,
namespace,
{min: {$lte: splitObjWithHashedValue}, max: {$gt: splitObjWithHashedValue}})[0];
assert(chunkToBeSplit);
// Split the 'chunkToBeSplit' using 'find'. Note that the object specified for 'find' is not a
// split point.
const splitObj = buildObjWithAllShardKeyFields(shardKey, nonHashedFieldValue);
assert.commandWorked(configDB.adminCommand({split: namespace, find: splitObj}));
assert.eq(++totalChunksBefore, findChunksUtil.countChunksForNs(configDB, namespace));
// Verify that a single chunk with the previous bounds no longer exists but split into two.
verifyChunkSplitIntoTwo(namespace, chunkToBeSplit);
assert.eq(0,
findChunksUtil.countChunksForNs(configDB, namespace, {min: splitObjWithHashedValue}));
// Get the new chunk in which 'splitObj' belongs.
chunkToBeSplit = findChunksUtil.findChunksByNs(
configDB,
namespace,
{min: {$lte: splitObjWithHashedValue}, max: {$gt: splitObjWithHashedValue}})[0];
// Use 'splitObj' as the middle point.
assert.commandWorked(
configDB.adminCommand({split: namespace, middle: splitObjWithHashedValue}));
assert.eq(++totalChunksBefore, findChunksUtil.countChunksForNs(configDB, namespace));
verifyChunkSplitIntoTwo(namespace, chunkToBeSplit);
// Cannot split on existing chunk boundary with 'middle'.
assert.commandFailed(configDB.adminCommand({split: namespace, middle: chunkToBeSplit.min}));
st.s.getDB("test")[collName].drop();
}
testSplit({x: "hashed", y: 1, z: 1}, "compound_hashed_prefix");
testSplit({_id: "hashed", y: 1, z: 1}, "compound_hashed_prefix_id");
testSplit({x: 1, y: "hashed", z: 1}, "compound_nonhashed_prefix");
testSplit({x: 1, _id: "hashed", z: 1}, "compound_nonhashed_prefix_id");
function testMoveChunk(shardKey) {
const ns = 'test.fooHashed';
assert.commandWorked(st.s0.adminCommand({shardCollection: ns, key: shardKey}));
// Fetch a chunk from 'shard0'.
const aChunk = findChunksUtil.findOneChunkByNs(configDB, ns, {shard: shard0});
assert(aChunk);
// Error if either of the bounds is not a valid shard key.
assert.commandFailedWithCode(
st.s0.adminCommand({moveChunk: ns, bounds: [NaN, aChunk.max], to: shard1}), 10065);
assert.commandFailedWithCode(
st.s0.adminCommand({moveChunk: ns, bounds: [aChunk.min, NaN], to: shard1}), 10065);
assert.commandWorked(
st.s0.adminCommand({moveChunk: ns, bounds: [aChunk.min, aChunk.max], to: shard1}));
assert.eq(0, configDB.chunks.count({_id: aChunk._id, shard: shard0}));
assert.eq(1, configDB.chunks.count({_id: aChunk._id, shard: shard1}));
// Fail if 'find' doesn't have full shard key.
assert.commandFailed(st.s0.adminCommand({moveChunk: ns, find: {someField: 0}, to: shard1}));
// Find the chunk to which 'moveObjWithHashedValue' belongs to.
const moveObjWithHashedValue = buildObjWithAllShardKeyFields(shardKey, hashedFieldValue);
const chunk = findChunksUtil.findChunksByNs(
st.config,
ns,
{min: {$lte: moveObjWithHashedValue}, max: {$gt: moveObjWithHashedValue}})[0];
assert(chunk);
// Verify that 'moveChunk' with 'find' works with pre-hashed value.
const otherShard = (chunk.shard === shard1) ? shard0 : shard1;
const moveObj = buildObjWithAllShardKeyFields(shardKey, nonHashedFieldValue);
assert.commandWorked(st.s.adminCommand({moveChunk: ns, find: moveObj, to: otherShard}));
assert.eq(findChunksUtil.countChunksForNs(st.config, ns, {min: chunk.min, shard: otherShard}),
1);
// Fail if 'find' and 'bounds' are both set.
assert.commandFailed(st.s0.adminCommand({
moveChunk: ns,
find: moveObjWithHashedValue,
bounds: [aChunk.min, aChunk.max],
to: shard1
}));
st.s.getDB("test").fooHashed.drop();
}
testMoveChunk({_id: "hashed", b: 1, c: 1});
testMoveChunk({_id: 1, "b.c.d": "hashed", c: 1});
st.stop();
})();
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