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/**
* Test that oplog (on both primary and secondary) rolls over when its size exceeds the configured
* maximum. This test runs on wiredTiger storage engine and inMemory storage engine (if available).
*/
(function() {
"use strict";
load("jstests/libs/fail_point_util.js");
function doTest(storageEngine) {
jsTestLog("Testing with storageEngine: " + storageEngine);
// Pause the oplog cap maintainer thread for this test until oplog truncation is needed. The
// truncation thread can hold a mutex for a short period of time which prevents new oplog stones
// from being created during an insertion if the mutex cannot be obtained immediately. Instead,
// the next insertion will attempt to create a new oplog stone, which this test does not do.
const replSet = new ReplSetTest({
// Set the syncdelay to 1s to speed up checkpointing.
nodeOptions: {
syncdelay: 1,
setParameter: {
logComponentVerbosity: tojson({storage: 2}),
'failpoint.hangOplogCapMaintainerThread': tojson({mode: 'alwaysOn'})
}
},
nodes: [{}, {rsConfig: {priority: 0, votes: 0}}]
});
// Set max oplog size to 1MB.
replSet.startSet({storageEngine: storageEngine, oplogSize: 1});
replSet.initiate();
const primary = replSet.getPrimary();
const primaryOplog = primary.getDB("local").oplog.rs;
const secondary = replSet.getSecondary();
const secondaryOplog = secondary.getDB("local").oplog.rs;
// Verify that the oplog cap maintainer thread is paused.
assert.commandWorked(primary.adminCommand({
waitForFailPoint: "hangOplogCapMaintainerThread",
timesEntered: 1,
maxTimeMS: kDefaultWaitForFailPointTimeout
}));
assert.commandWorked(secondary.adminCommand({
waitForFailPoint: "hangOplogCapMaintainerThread",
timesEntered: 1,
maxTimeMS: kDefaultWaitForFailPointTimeout
}));
const coll = primary.getDB("test").foo;
// 400KB each so that oplog can keep at most two insert oplog entries.
const longString = new Array(400 * 1024).join("a");
function numInsertOplogEntry(oplog) {
print(`Oplog times for ${oplog.getMongo().host}: ${
tojsononeline(oplog.find().projection({ts: 1, t: 1, op: 1, ns: 1}).toArray())}`);
return oplog.find({op: "i", "ns": "test.foo"}).itcount();
}
// Insert the first document.
const firstInsertTimestamp =
assert
.commandWorked(coll.runCommand(
"insert", {documents: [{_id: 0, longString: longString}], writeConcern: {w: 2}}))
.operationTime;
jsTestLog("First insert timestamp: " + tojson(firstInsertTimestamp));
// Test that oplog entry of the first insert exists on both primary and secondary.
assert.eq(1, numInsertOplogEntry(primaryOplog));
assert.eq(1, numInsertOplogEntry(secondaryOplog));
// Insert the second document.
const secondInsertTimestamp =
assert
.commandWorked(coll.runCommand(
"insert", {documents: [{_id: 1, longString: longString}], writeConcern: {w: 2}}))
.operationTime;
jsTestLog("Second insert timestamp: " + tojson(secondInsertTimestamp));
// Test that oplog entries of both inserts exist on both primary and secondary.
assert.eq(2, numInsertOplogEntry(primaryOplog));
assert.eq(2, numInsertOplogEntry(secondaryOplog));
// Have a more fine-grained test for enableMajorityReadConcern=true to also test oplog
// truncation happens at the time we expect it to happen. When
// enableMajorityReadConcern=false the lastStableRecoveryTimestamp is not available, so
// switch to a coarser-grained mode to only test that oplog truncation will eventually
// happen when oplog size exceeds the configured maximum.
if (primary.getDB('admin').serverStatus().storageEngine.supportsCommittedReads) {
const awaitCheckpointer = function(timestamp) {
assert.soon(
() => {
const primaryTimestamp =
assert.commandWorked(primary.adminCommand({replSetGetStatus: 1}))
.lastStableRecoveryTimestamp;
const secondaryTimestamp =
assert.commandWorked(secondary.adminCommand({replSetGetStatus: 1}))
.lastStableRecoveryTimestamp;
jsTestLog("Awaiting last stable recovery timestamp " +
`(primary: ${tojson(primaryTimestamp)}, secondary: ${
tojson(secondaryTimestamp)}) ` +
`target: ${tojson(timestamp)}`);
return ((timestampCmp(primaryTimestamp, timestamp) >= 0) &&
(timestampCmp(secondaryTimestamp, timestamp) >= 0));
},
"Timeout waiting for checkpointing to catch up",
ReplSetTest.kDefaultTimeoutMS,
2000);
};
// Wait for checkpointing/stable timestamp to catch up with the second insert so oplog
// entry of the first insert is allowed to be deleted by the oplog cap maintainer thread
// when a new oplog stone is created. "inMemory" WT engine does not run checkpoint
// thread and lastStableRecoveryTimestamp is the stable timestamp in this case.
awaitCheckpointer(secondInsertTimestamp);
// Insert the third document which will trigger a new oplog stone to be created. The
// oplog cap maintainer thread will then be unblocked on the creation of the new oplog
// stone and will start truncating oplog entries. The oplog entry for the first
// insert will be truncated after the oplog cap maintainer thread finishes.
const thirdInsertTimestamp =
assert
.commandWorked(coll.runCommand(
"insert",
{documents: [{_id: 2, longString: longString}], writeConcern: {w: 2}}))
.operationTime;
jsTestLog("Third insert timestamp: " + tojson(thirdInsertTimestamp));
// There is a race between how we calculate the pinnedOplog and checkpointing. The timestamp
// of the pinnedOplog could be less than the actual stable timestamp used in a checkpoint.
// Wait for the checkpointer to run for another round to make sure the first insert oplog is
// not pinned.
awaitCheckpointer(thirdInsertTimestamp);
// Verify that there are three oplog entries while the oplog cap maintainer thread is
// paused.
assert.eq(3, numInsertOplogEntry(primaryOplog));
assert.eq(3, numInsertOplogEntry(secondaryOplog));
// Let the oplog cap maintainer thread start truncating the oplog.
assert.commandWorked(primary.adminCommand(
{configureFailPoint: "hangOplogCapMaintainerThread", mode: "off"}));
assert.commandWorked(secondary.adminCommand(
{configureFailPoint: "hangOplogCapMaintainerThread", mode: "off"}));
// Test that oplog entry of the initial insert rolls over on both primary and secondary.
// Use assert.soon to wait for oplog cap maintainer thread to run.
assert.soon(() => {
return numInsertOplogEntry(primaryOplog) === 2;
}, "Timeout waiting for oplog to roll over on primary");
assert.soon(() => {
return numInsertOplogEntry(secondaryOplog) === 2;
}, "Timeout waiting for oplog to roll over on secondary");
const res = primary.getDB("test").runCommand({serverStatus: 1});
assert.commandWorked(res);
assert.eq(res.oplogTruncation.truncateCount, 1, tojson(res.oplogTruncation));
assert.gt(res.oplogTruncation.totalTimeTruncatingMicros, 0, tojson(res.oplogTruncation));
} else {
// Let the oplog cap maintainer thread start truncating the oplog.
assert.commandWorked(primary.adminCommand(
{configureFailPoint: "hangOplogCapMaintainerThread", mode: "off"}));
assert.commandWorked(secondary.adminCommand(
{configureFailPoint: "hangOplogCapMaintainerThread", mode: "off"}));
// Only test that oplog truncation will eventually happen.
let numInserted = 2;
assert.soon(function() {
// Insert more documents.
assert.commandWorked(
coll.insert({_id: numInserted++, longString: longString}, {writeConcern: {w: 2}}));
const numInsertOplogEntryPrimary = numInsertOplogEntry(primaryOplog);
const numInsertOplogEntrySecondary = numInsertOplogEntry(secondaryOplog);
// Oplog has been truncated if the number of insert oplog entries is less than
// number of inserted.
if (numInsertOplogEntryPrimary < numInserted &&
numInsertOplogEntrySecondary < numInserted)
return true;
jsTestLog("Awaiting oplog truncation: number of oplog entries: " +
`(primary: ${tojson(numInsertOplogEntryPrimary)}, ` +
`secondary: ${tojson(numInsertOplogEntrySecondary)}) ` +
`number inserted: ${numInserted}`);
return false;
}, "Timeout waiting for oplog to roll over", ReplSetTest.kDefaultTimeoutMS, 1000);
}
replSet.stopSet();
}
doTest("wiredTiger");
if (jsTest.options().storageEngine !== "inMemory") {
jsTestLog(
"Skipping inMemory test because inMemory storageEngine was not compiled into the server.");
return;
}
doTest("inMemory");
})();
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