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/**
* Sends killOp on the coordinator's OperationContext's opId at each point in the commit
* coordination where there is an OperationContext and ensures the coordination still runs to
* completion for all the points.
*
* @tags: [uses_transactions, uses_multi_shard_transaction]
*/
(function() {
'use strict';
load('jstests/sharding/libs/sharded_transactions_helpers.js');
const dbName = "test";
const collName = "foo";
const ns = dbName + "." + collName;
let st = new ShardingTest({shards: 3, causallyConsistent: true});
let coordinator = st.shard0;
let participant1 = st.shard1;
let participant2 = st.shard2;
let lsid = {id: UUID()};
let txnNumber = 0;
const runCommitThroughMongosInParallelShellExpectSuccess = function() {
const runCommitExpectSuccessCode = "assert.commandWorked(db.adminCommand({" +
"commitTransaction: 1," +
"lsid: " + tojson(lsid) + "," +
"txnNumber: NumberLong(" + txnNumber + ")," +
"stmtId: NumberInt(0)," +
"autocommit: false," +
"}));";
return startParallelShell(runCommitExpectSuccessCode, st.s.port);
};
const runCommitThroughMongosInParallelShellExpectAbort = function() {
const runCommitExpectSuccessCode = "assert.commandFailedWithCode(db.adminCommand({" +
"commitTransaction: 1," +
"lsid: " + tojson(lsid) + "," +
"txnNumber: NumberLong(" + txnNumber + ")," +
"stmtId: NumberInt(0)," +
"autocommit: false," +
"})," +
"ErrorCodes.NoSuchTransaction);";
return startParallelShell(runCommitExpectSuccessCode, st.s.port);
};
const setUp = function() {
// Create a sharded collection with a chunk on each shard:
// shard0: [-inf, 0)
// shard1: [0, 10)
// shard2: [10, +inf)
assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
assert.commandWorked(st.s.adminCommand({movePrimary: dbName, to: coordinator.shardName}));
assert.commandWorked(st.s.adminCommand({shardCollection: ns, key: {_id: 1}}));
assert.commandWorked(st.s.adminCommand({split: ns, middle: {_id: 0}}));
assert.commandWorked(st.s.adminCommand({split: ns, middle: {_id: 10}}));
assert.commandWorked(
st.s.adminCommand({moveChunk: ns, find: {_id: 0}, to: participant1.shardName}));
assert.commandWorked(
st.s.adminCommand({moveChunk: ns, find: {_id: 10}, to: participant2.shardName}));
// These forced refreshes are not strictly necessary; they just prevent extra TXN log lines
// from the shards starting, aborting, and restarting the transaction due to needing to
// refresh after the transaction has started.
assert.commandWorked(coordinator.adminCommand({_flushRoutingTableCacheUpdates: ns}));
assert.commandWorked(participant1.adminCommand({_flushRoutingTableCacheUpdates: ns}));
assert.commandWorked(participant2.adminCommand({_flushRoutingTableCacheUpdates: ns}));
st.refreshCatalogCacheForNs(st.s, ns);
// Start a new transaction by inserting a document onto each shard.
assert.commandWorked(st.s.getDB(dbName).runCommand({
insert: collName,
documents: [{_id: -5}, {_id: 5}, {_id: 15}],
lsid: lsid,
txnNumber: NumberLong(txnNumber),
stmtId: NumberInt(0),
startTransaction: true,
autocommit: false,
}));
};
const testCommitProtocol = function(shouldCommit, failpointData) {
jsTest.log("Testing two-phase " + (shouldCommit ? "commit" : "abort") +
" protocol with failpointData: " + tojson(failpointData));
txnNumber++;
setUp();
if (!shouldCommit) {
// Manually abort the transaction on one of the participants, so that the participant
// fails to prepare.
assert.commandWorked(participant2.adminCommand({
abortTransaction: 1,
lsid: lsid,
txnNumber: NumberLong(txnNumber),
stmtId: NumberInt(0),
autocommit: false,
}));
}
// Turn on failpoint to make the coordinator hang at a the specified point.
assert.commandWorked(coordinator.adminCommand({
configureFailPoint: failpointData.failpoint,
mode: {skip: (failpointData.skip ? failpointData.skip : 0)},
}));
// Run commitTransaction through a parallel shell.
let awaitResult;
if (shouldCommit) {
awaitResult = runCommitThroughMongosInParallelShellExpectSuccess();
} else {
awaitResult = runCommitThroughMongosInParallelShellExpectAbort();
}
// Deliver killOp once the failpoint has been hit.
waitForFailpoint("Hit " + failpointData.failpoint + " failpoint",
failpointData.numTimesShouldBeHit);
jsTest.log("Going to find coordinator opCtx ids");
let coordinatorOpsToKill = [];
assert.soon(() => {
coordinatorOpsToKill = coordinator.getDB("admin")
.aggregate([
{$currentOp: {'allUsers': true, 'idleConnections': true}},
{
$match: {
$and: [
{desc: "TransactionCoordinator"},
// Filter out the prepareTransaction op on the
// coordinator itself since killing it would
// cause the transaction to abort.
{"command.prepareTransaction": {$exists: false}}
]
}
}
])
.toArray();
for (let x = 0; x < coordinatorOpsToKill.length; x++) {
if (!coordinatorOpsToKill[x].opid) {
print("Retrying currentOp because op doesn't have opId: " +
tojson(coordinatorOpsToKill[x]));
return false;
}
}
return true;
}, 'timed out trying to fetch coordinator ops', undefined /* timeout */, 1000 /* interval */);
// Use "greater than or equal to" since, for failpoints that pause the coordinator while
// it's sending prepare or sending the decision, there might be one additional thread that's
// doing the "send" to the local participant (or that thread might have already completed).
assert.gte(coordinatorOpsToKill.length, failpointData.numTimesShouldBeHit);
coordinatorOpsToKill.forEach(function(coordinatorOp) {
coordinator.getDB("admin").killOp(coordinatorOp.opid);
});
assert.commandWorked(coordinator.adminCommand({
configureFailPoint: failpointData.failpoint,
mode: "off",
}));
// If the commit coordination was not robust to killOp, then commitTransaction would fail
// with an Interrupted error rather than fail with NoSuchTransaction or return success.
jsTest.log("Wait for the commit coordination to complete.");
awaitResult();
// If deleting the coordinator doc was not robust to killOp, the document would still exist.
assert.eq(0, coordinator.getDB("config").getCollection("transaction_coordinators").count());
// Check that the transaction committed or aborted as expected.
if (!shouldCommit) {
jsTest.log("Verify that the transaction was aborted on all shards.");
assert.eq(0, st.s.getDB(dbName).getCollection(collName).find().itcount());
} else {
jsTest.log("Verify that the transaction was committed on all shards.");
// Use assert.soon(), because although coordinateCommitTransaction currently blocks
// until the commit process is fully complete, it will eventually be changed to only
// block until the decision is *written*, at which point the test can pass the
// operationTime returned by coordinateCommitTransaction as 'afterClusterTime' in the
// read to ensure the read sees the transaction's writes (TODO SERVER-37165).
assert.soon(function() {
return 3 === st.s.getDB(dbName).getCollection(collName).find().itcount();
});
}
st.s.getDB(dbName).getCollection(collName).drop();
};
const failpointDataArr = getCoordinatorFailpoints();
// Test commit path.
failpointDataArr.forEach(function(failpointData) {
testCommitProtocol(true /* shouldCommit */, failpointData);
clearRawMongoProgramOutput();
});
st.stop();
})();
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