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(function() {
"use strict";
load("jstests/libs/uuid_util.js");
const dbName = "test";
const collName = "foo";
const ns = dbName + "." + collName;
const rangeDeletionNs = "config.rangeDeletions";
// Create 2 shards with 3 replicas each.
let st = new ShardingTest({shards: {rs0: {nodes: 3}, rs1: {nodes: 3}}});
// Create a sharded collection with two chunks: [-inf, 50), [50, inf)
assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
assert.commandWorked(st.s.adminCommand({movePrimary: dbName, to: st.shard0.shardName}));
assert.commandWorked(st.s.adminCommand({shardCollection: ns, key: {x: 1}}));
assert.commandWorked(st.s.adminCommand({split: ns, middle: {x: 50}}));
// Pause range deletion.
let originalShard0Primary = st.rs0.getPrimary();
originalShard0Primary.adminCommand({configureFailPoint: 'suspendRangeDeletion', mode: 'alwaysOn'});
// Write range to deletion collection
let deletionTask = {
_id: UUID(),
nss: ns,
collectionUuid: UUID(),
donorShardId: "unused",
range: {min: {x: 50}, max: {x: MaxKey}},
whenToClean: "now",
// Mark the range as pending, otherwise the task will be processed immediately on being
// inserted (and deleted after it's proessed) rather than being deleted on setFCV downgrade.
pending: true
};
let deletionsColl = st.shard0.getCollection(rangeDeletionNs);
// Write range to deletion collection
assert.commandWorked(deletionsColl.insert(deletionTask));
// Verify deletion count.
assert.eq(deletionsColl.find().itcount(), 1);
print("setting fcv: " + lastStableFCV);
assert.commandWorked(
st.s.getDB("admin").runCommand({setFeatureCompatibilityVersion: lastStableFCV}));
checkFCV(st.shard0.getDB("admin"), lastStableFCV);
// Verify deletion count.
assert.eq(deletionsColl.find().itcount(), 0);
st.stop();
})();
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