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/**
* Test that mongos retries with a new read timestamp if a non-transaction snapshot read fails
* with a SnapshotError.
*
* @tags: [
* requires_fcv_47,
* requires_majority_read_concern,
* requires_persistence,
* ]
*
* - Create a sharded collection and insert a document.
* - Start a snapshot read with no atClusterTime, tne read selects some atClusterTime T.
* - Block the read with a failpoint.
* - Update the document at timestamp updateTS > T.
* - Sleep until updateTS is older than historyWindowSecs.
* - Insert a document with w: majority to trigger history cleanup.
* - Unblock the read.
* - The read will fail with SnapshotTooOld, mongos should retry and succeed.
* - Assert the read succeeded and returned the updated (post-updateTS) document.
*/
(function() {
"use strict";
load("jstests/libs/fail_point_util.js");
load("jstests/libs/parallel_shell_helpers.js");
load("jstests/sharding/libs/sharded_transactions_helpers.js");
const historyWindowSecs = 10;
const st = new ShardingTest({
shards: {rs0: {nodes: 1}},
other: {rsOptions: {setParameter: {minSnapshotHistoryWindowInSeconds: historyWindowSecs}}}
});
const primaryAdmin = st.rs0.getPrimary().getDB("admin");
assert.eq(assert
.commandWorked(
primaryAdmin.runCommand({getParameter: 1, minSnapshotHistoryWindowInSeconds: 1}))
.minSnapshotHistoryWindowInSeconds,
historyWindowSecs);
const mongosDB = st.s.getDB("test");
const mongosColl = mongosDB.test;
assert.commandWorked(mongosDB.adminCommand({enableSharding: mongosDB.getName()}));
st.ensurePrimaryShard(mongosDB.getName(), st.rs0.getURL());
st.shardColl(mongosColl, {_id: 1}, false);
let result =
mongosDB.runCommand({insert: "test", documents: [{_id: 0}], writeConcern: {w: "majority"}});
const insertTS = assert.commandWorked(result).operationTime;
jsTestLog(`Inserted document at ${tojson(insertTS)}`);
assert.commandWorked(primaryAdmin.runCommand({
configureFailPoint: "waitInFindBeforeMakingBatch",
mode: "alwaysOn",
data: {nss: "test.test"}
}));
function read(insertTS, enableCausal) {
const readConcern = {level: "snapshot"};
if (enableCausal) {
readConcern.afterClusterTime = insertTS;
}
let result = assert.commandWorked(db.runCommand(
{find: "test", filter: {_id: 0}, singleBatch: true, readConcern: readConcern}));
jsTestLog(`find result for enableCausal=${enableCausal}: ${tojson(result)}`);
assert.gt(result.cursor.atClusterTime, insertTS);
assert.eq(result.cursor.firstBatch[0], {_id: 0, x: "updatedValue"});
}
const waitForShell = startParallelShell(funWithArgs(read, insertTS, false), st.s.port);
const waitForShellCausal = startParallelShell(funWithArgs(read, insertTS, true), st.s.port);
jsTestLog("Wait for shells to hit waitInFindBeforeMakingBatch failpoint");
assert.commandWorked(primaryAdmin.runCommand({
waitForFailPoint: "waitInFindBeforeMakingBatch",
timesEntered: 2,
maxTimeMS: kDefaultWaitForFailPointTimeout
}));
jsTestLog("Update document");
result = mongosDB.runCommand({
update: "test",
updates: [{q: {_id: 0}, u: {$set: {x: "updatedValue"}}}],
writeConcern: {w: "majority"}
});
const updateTS = assert.commandWorked(result).operationTime;
jsTestLog(`Updated document at updateTS ${tojson(updateTS)}`);
jsTestLog("Sleep until updateTS is older than historyWindowSecs");
const testMarginMS = 1000;
sleep(historyWindowSecs * 1000 + testMarginMS);
jsTestLog("Trigger history cleanup with a w-majority insert");
assert.commandWorked(
mongosDB.runCommand({insert: "test", documents: [{_id: 1}], writeConcern: {w: "majority"}}));
jsTestLog("Disable failpoint");
assert.commandWorked(
primaryAdmin.runCommand({configureFailPoint: "waitInFindBeforeMakingBatch", mode: "off"}));
jsTestLog("Wait for shells to finish");
waitForShell();
waitForShellCausal();
st.stop();
})();
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