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/**
* Tests that WriteConflictException is handled when applying transfer mods during migrations.
*/
(function() {
'use strict';
load("jstests/libs/fail_point_util.js");
load('jstests/libs/parallel_shell_helpers.js');
const dbName = "test";
const collName = "foo";
const ns = dbName + "." + collName;
let st = new ShardingTest({shards: 2});
// 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}}));
let testDB = st.s.getDB(dbName);
let testColl = testDB.foo;
for (let i = 0; i < 100; i++) {
assert.commandWorked(testColl.insert({x: i}));
}
let preTransferModsFailpoint = configureFailPoint(st.shard1, "migrateThreadHangAtStep3");
const awaitResult = startParallelShell(
funWithArgs(function(ns, toShardName) {
assert.commandWorked(
db.adminCommand({moveChunk: ns, find: {x: 50}, to: toShardName, _waitForDelete: true}));
}, ns, st.shard1.shardName), st.s.port);
preTransferModsFailpoint.wait();
// Perform each operation that will generate a transfer mod operation in the migration thread. The
// migration thread processes inserts, updates and deletions which can all throw
// WriteConflictException.
for (let i = 100; i < 200; i++) {
assert.commandWorked(testColl.insert({x: i}));
}
for (let i = 50; i < 75; ++i) {
assert.commandWorked(testColl.remove({x: i}));
}
for (let i = 75; i < 100; ++i) {
assert.commandWorked(testColl.update({x: i}, {x: i, updated: true}));
}
// Trigger WriteConflictExceptions during writes.
assert.commandWorked(st.shard1.adminCommand(
{configureFailPoint: 'WTWriteConflictException', mode: {activationProbability: 0.5}}));
preTransferModsFailpoint.off();
awaitResult();
st.stop();
})();
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