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/**
* Reproduces a bug where searching for a key returns an adjacent key in a recently-committed
* prepared transaction. See SERVER-56839.
*
* Create an index with a single key, "a". Insert a new key for "b" in a prepared transaction. This
* creates a prepared, but uncommitted index entry before the key we want to search for, "c", which
* doesn't exist. We will query (search_near internally) for "c" and the cursor will initially land
* on "a". This is less than they key were searching for, so the cursor is advanced to the next key,
* expecting to land on something greater than or equal to "c". Before this happens, the prepared
* transaction commits, making "b" visible. Ensure that the cursor does not return "b" even though
* we queried for "c".
*
* @tags: [
* requires_replication,
* uses_transactions,
* ]
*/
(function() {
"use strict";
load("jstests/core/txns/libs/prepare_helpers.js");
load("jstests/libs/fail_point_util.js");
load('jstests/libs/parallel_shell_helpers.js');
const replTest = new ReplSetTest({nodes: 1});
replTest.startSet();
replTest.initiate();
const primary = replTest.getPrimary();
const dbName = 'test';
const collName = 'coll';
const db = primary.getDB(dbName);
assert.commandWorked(db[collName].createIndex({x: 1}));
assert.commandWorked(db[collName].insert({x: 'a'}));
const session = primary.startSession({causalConsistency: false});
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB.getCollection(collName);
session.startTransaction();
sessionColl.insert({x: 'b'});
const prepareTimestamp = PrepareHelpers.prepareTransaction(session);
const failpoint = configureFailPoint(primary, "WTIndexPauseAfterSearchNear", {indexName: 'x_1'});
// After the query on 'c' starts, we commit the transaction and advance the cursor. Expect that this
// finds nothing.
const awaitShell = startParallelShell(function() {
assert.eq(null, db.coll.findOne({x: 'c'}));
}, primary.port);
failpoint.wait();
assert.commandWorked(PrepareHelpers.commitTransaction(session, prepareTimestamp));
failpoint.off();
awaitShell();
replTest.stopSet();
})();
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