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/**
* Test that chunks and documents are moved correctly after zone changes.
*/
(function() {
'use strict';
load("jstests/sharding/libs/zone_changes_util.js");
/**
* Adds each shard to the corresponding zone in zoneTags, and makes the zone range equal
* to the chunk range of the shard. Assumes that there are no chunk holes on each shard.
*/
function addShardsToZonesAndAssignZoneRanges(st, ns, shardChunkBounds, shardTags) {
let zoneChunks = {};
for (let [shardName, chunkBounds] of Object.entries(shardChunkBounds)) {
let zoneName = shardTags[shardName][0];
let rangeMin = {x: MaxKey};
let rangeMax = {x: MinKey};
for (let bounds of chunkBounds) {
if (chunkBoundsUtil.lt(bounds[0], rangeMin)) {
rangeMin = bounds[0];
}
if (chunkBoundsUtil.gte(bounds[1], rangeMax)) {
rangeMax = bounds[1];
}
}
zoneChunks[zoneName] = chunkBounds;
assert.commandWorked(st.s.adminCommand({addShardToZone: shardName, zone: zoneName}));
assert.commandWorked(st.s.adminCommand(
{updateZoneKeyRange: ns, min: rangeMin, max: rangeMax, zone: zoneName}));
}
return zoneChunks;
}
/**
* Returns the highest chunk bounds out of the given chunk bounds. Assumes that the
* chunks do not overlap.
*/
function findHighestChunkBounds(chunkBounds) {
let highestBounds = chunkBounds[0];
for (let i = 1; i < chunkBounds.length; i++) {
if (chunkBoundsUtil.lt(highestBounds, chunkBounds[i])) {
highestBounds = chunkBounds[i];
}
}
return highestBounds;
}
let st = new ShardingTest({shards: 3});
let primaryShard = st.shard0;
let dbName = "test";
let testDB = st.s.getDB(dbName);
let configDB = st.s.getDB("config");
let coll = testDB.hashed;
let ns = coll.getFullName();
let shardKey = {x: "hashed"};
assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
st.ensurePrimaryShard(dbName, primaryShard.shardName);
jsTest.log(
"Shard the collection. The command creates two chunks on each of the shards by default.");
assert.commandWorked(st.s.adminCommand({shardCollection: ns, key: shardKey}));
let chunkDocs = configDB.chunks.find({ns: ns}).toArray();
let shardChunkBounds = chunkBoundsUtil.findShardChunkBounds(chunkDocs);
jsTest.log("Insert docs (one for each chunk) and check that they end up on the right shards.");
let docs = [{x: -25}, {x: -18}, {x: -5}, {x: -1}, {x: 5}, {x: 10}];
assert.commandWorked(coll.insert(docs));
let docChunkBounds = [];
let minHash = MaxKey;
docs.forEach(function(doc) {
let hash = convertShardKeyToHashed(doc.x);
let {shard, bounds} =
chunkBoundsUtil.findShardAndChunkBoundsForShardKey(st, shardChunkBounds, {x: hash});
assert.eq(1, shard.getCollection(ns).count(doc));
docChunkBounds.push(bounds);
if (bsonWoCompare(hash, minHash) < 0) {
minHash = hash;
}
});
assert.eq(docs.length, (new Set(docChunkBounds)).size);
assert.eq(docs.length, configDB.chunks.count({ns: ns}));
jsTest.log(
"Assign each shard a zone, make each zone range equal to the chunk range for the shard, " +
"and store the chunks for each zone.");
let shardTags = {
[st.shard0.shardName]: ["zoneA"],
[st.shard1.shardName]: ["zoneB"],
[st.shard2.shardName]: ["zoneC"]
};
let zoneChunkBounds = addShardsToZonesAndAssignZoneRanges(st, ns, shardChunkBounds, shardTags);
assertShardTags(configDB, shardTags);
jsTest.log("Test shard's zone changes...");
jsTest.log(
"Check that removing a zone from a shard causes its chunks and documents to move to other" +
" shards that the zone belongs to.");
moveZoneToShard(st, "zoneA", st.shard0, st.shard1);
shardTags = {
[st.shard0.shardName]: [],
[st.shard1.shardName]: ["zoneB", "zoneA"],
[st.shard2.shardName]: ["zoneC"]
};
assertShardTags(configDB, shardTags);
runBalancer(st, zoneChunkBounds["zoneA"].length);
shardChunkBounds = {
[st.shard0.shardName]: [],
[st.shard1.shardName]: [...zoneChunkBounds["zoneB"], ...zoneChunkBounds["zoneA"]],
[st.shard2.shardName]: zoneChunkBounds["zoneC"]
};
assertChunksOnShards(configDB, ns, shardChunkBounds);
assertDocsOnShards(st, ns, shardChunkBounds, docs, shardKey);
jsTest.log("Check that the balancer balances chunks within zones.");
assert.commandWorked(st.s.adminCommand({addShardToZone: st.shard0.shardName, zone: "zoneB"}));
shardTags = {
[st.shard0.shardName]: ["zoneB"],
[st.shard1.shardName]: ["zoneB", "zoneA"],
[st.shard2.shardName]: ["zoneC"]
};
assertShardTags(configDB, shardTags);
let numChunksToMove = zoneChunkBounds["zoneB"].length / 2;
runBalancer(st, numChunksToMove);
shardChunkBounds = {
[st.shard0.shardName]: zoneChunkBounds["zoneB"].slice(0, numChunksToMove),
[st.shard1.shardName]: [
...zoneChunkBounds["zoneA"],
...zoneChunkBounds["zoneB"].slice(numChunksToMove, zoneChunkBounds["zoneB"].length)
],
[st.shard2.shardName]: zoneChunkBounds["zoneC"]
};
assertChunksOnShards(configDB, ns, shardChunkBounds);
assertDocsOnShards(st, ns, shardChunkBounds, docs, shardKey);
jsTest.log("Make another zone change, and check that the chunks and docs are on the right shards.");
assert.commandWorked(st.s.adminCommand({removeShardFromZone: st.shard0.shardName, zone: "zoneB"}));
moveZoneToShard(st, "zoneC", st.shard2, st.shard0);
moveZoneToShard(st, "zoneA", st.shard1, st.shard2);
shardTags = {
[st.shard0.shardName]: ["zoneC"],
[st.shard1.shardName]: ["zoneB"],
[st.shard2.shardName]: ["zoneA"]
};
assertShardTags(configDB, shardTags);
runBalancer(st,
numChunksToMove + zoneChunkBounds["zoneA"].length + zoneChunkBounds["zoneC"].length);
shardChunkBounds = {
[st.shard0.shardName]: zoneChunkBounds["zoneC"],
[st.shard1.shardName]: zoneChunkBounds["zoneB"],
[st.shard2.shardName]: zoneChunkBounds["zoneA"]
};
assertChunksOnShards(configDB, ns, shardChunkBounds);
assertDocsOnShards(st, ns, shardChunkBounds, docs, shardKey);
jsTest.log("Test chunk's zone changes...");
// Find the chunk with the highest bounds in zoneA.
let originalZoneARange = chunkBoundsUtil.computeRange(zoneChunkBounds["zoneA"]);
let chunkToMove = findHighestChunkBounds(zoneChunkBounds["zoneA"]);
assert(chunkBoundsUtil.containsKey(chunkToMove[0], ...originalZoneARange));
assert(chunkBoundsUtil.eq(chunkToMove[1], originalZoneARange[1]));
jsTest.log("Make the chunk originally in zoneA belong to zoneB.");
assert.commandWorked(st.s.adminCommand(
{updateZoneKeyRange: ns, min: originalZoneARange[0], max: originalZoneARange[1], zone: null}));
assert.commandWorked(st.s.adminCommand(
{updateZoneKeyRange: ns, min: originalZoneARange[0], max: chunkToMove[0], zone: "zoneA"}));
assert.commandWorked(st.s.adminCommand(
{updateZoneKeyRange: ns, min: chunkToMove[0], max: originalZoneARange[1], zone: "zoneB"}));
jsTest.log("Check that the chunk moves from zoneA to zoneB after the zone range change");
runBalancer(st, 1);
shardChunkBounds = {
[st.shard0.shardName]: zoneChunkBounds["zoneC"],
[st.shard1.shardName]: [chunkToMove, ...zoneChunkBounds["zoneB"]],
[st.shard2.shardName]: zoneChunkBounds["zoneA"].filter(
(chunkBounds) => !chunkBoundsUtil.eq(chunkToMove, chunkBounds))
};
assertChunksOnShards(configDB, ns, shardChunkBounds);
assertDocsOnShards(st, ns, shardChunkBounds, docs, shardKey);
jsTest.log("Make the chunk originally in zoneB belong to zoneC.");
assert.commandWorked(st.s.adminCommand(
{updateZoneKeyRange: ns, min: chunkToMove[0], max: chunkToMove[1], zone: null}));
assert.commandWorked(st.s.adminCommand(
{updateZoneKeyRange: ns, min: chunkToMove[0], max: chunkToMove[1], zone: "zoneC"}));
jsTest.log("Check that the chunk moves from zoneB to zoneC after the zone range change");
runBalancer(st, 1);
shardChunkBounds = {
[st.shard0.shardName]: [chunkToMove, ...zoneChunkBounds["zoneC"]],
[st.shard1.shardName]: zoneChunkBounds["zoneB"],
[st.shard2.shardName]: zoneChunkBounds["zoneA"].filter(
(chunkBounds) => !chunkBoundsUtil.eq(chunkToMove, chunkBounds))
};
assertChunksOnShards(configDB, ns, shardChunkBounds);
assertDocsOnShards(st, ns, shardChunkBounds, docs, shardKey);
st.stop();
})();
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