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/**
* The slim oplog is a view on the oplog to support efficient lookup queries for resharding.
*
* @tags: [
* requires_majority_read_concern,
* requires_replication,
* sbe_incompatible,
* uses_prepare_transaction,
* uses_transactions,
* ]
*/
(function() {
"use strict";
load("jstests/libs/retryable_writes_util.js");
if (!RetryableWritesUtil.storageEngineSupportsRetryableWrites(jsTest.options().storageEngine)) {
jsTestLog("Retryable writes are not supported, skipping test");
return;
}
load("jstests/core/txns/libs/prepare_helpers.js");
const rst = new ReplSetTest({nodes: 2});
rst.startSet();
rst.initiate();
const rsConn = new Mongo(rst.getURL());
const oplog = rst.getPrimary().getDB("local")["oplog.rs"];
const slimOplog = rst.getPrimary().getDB("local")["system.resharding.slimOplogForGraphLookup"];
const session = rsConn.startSession({retryWrites: true});
const collection = session.getDatabase("test")["collection"];
{
// Assert an oplog entry representing a retryable write projects a `prevOpTime.ts` of the null
// timestamp.
assert.commandWorked(collection.insert({_id: "slim"}));
const oplogEntry = oplog.find({"o._id": "slim"}).next();
jsTestLog({"slim entry": oplogEntry, "slim": slimOplog.exists()});
assert(oplogEntry.hasOwnProperty("txnNumber"));
assert(oplogEntry.hasOwnProperty("stmtId"));
assert.eq(Timestamp(0, 0), slimOplog.find({ts: oplogEntry["ts"]}).next()["prevOpTime"]["ts"]);
}
{
// Assert an oplog entry that commits a prepared transaction projects a `prevOpTime.ts` equal to
// the timestamp of the preparing oplog entry.
session.startTransaction();
assert.commandWorked(collection.insert({_id: "slim_1"}));
assert.commandWorked(collection.insert({_id: "slim_2"}));
let prepTs = PrepareHelpers.prepareTransaction(session);
assert.commandWorked(PrepareHelpers.commitTransaction(session, prepTs));
const commitEntry = oplog.find({"prevOpTime.ts": prepTs}).next();
assert.eq(prepTs, commitEntry["prevOpTime"]["ts"]);
jsTestLog({
PrepEntry: oplog.find({ts: prepTs}).next(),
CommitEntry: commitEntry,
SlimEntry: slimOplog.find({ts: commitEntry["ts"]}).next()
});
// Perform a $graphLookup connecting non-trivial slim oplog entries to the associated applyOps
// operations. Assert the history is as expected.
let oplogDocsWithHistory = oplog.aggregate([
{$match: {ts: commitEntry["ts"]}},
{$graphLookup: {from: "system.resharding.slimOplogForGraphLookup",
startWith: "$ts",
connectFromField: "prevOpTime.ts",
connectToField: "ts",
depthField: "depthForResharding",
as: "history"}},
// For the purposes of this test, unwind the history to give a predictable order of items
// that graphLookup accumulates.
{$unwind: "$history"},
{$sort: {"history.ts": 1}}
]).toArray();
jsTestLog({"Unwound history": oplogDocsWithHistory});
assert.eq(2, oplogDocsWithHistory.length);
assert.eq(1, oplogDocsWithHistory[0]["history"]["depthForResharding"]);
assert.eq(Timestamp(0, 0), oplogDocsWithHistory[0]["history"]["prevOpTime"]["ts"]);
assert.eq(2, oplogDocsWithHistory[0]["history"]["o"]["applyOps"].length);
assert.eq(0, oplogDocsWithHistory[1]["history"].depthForResharding);
assert.eq(prepTs, oplogDocsWithHistory[1]["history"]["prevOpTime"]["ts"]);
assert.eq({}, oplogDocsWithHistory[1]["history"]["o"]);
}
rst.stopSet();
})();
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