SERVER-50060 Make oplog_slow_sampling_logging.js tolerant to small changes in the clock. Also make it faster by using batch operations.

(cherry picked from commit ce617fa26c59551e93f3950353352ecabee38b44)

1 files changed, 20 insertions, 4 deletions

diff --git a/jstests/replsets/oplog_slow_sampling_logging.js b/jstests/replsets/oplog_slow_sampling_logging.js
index b679c3b20e4..91c0d46716b 100644
--- a/jstests/replsets/oplog_slow_sampling_logging.js
+++ b/jstests/replsets/oplog_slow_sampling_logging.js
@@ -6,9 +6,16 @@
 (function() {
 "use strict";
 
-const kOplogDocs = 45000;
+const kOplogDocs = 47500;
 // kNumOplogSamples is derived from the number of oplog entries above.
-const kNumOplogSamples = 15;
+// Formula is kRandomSamplesPerStone * numRecords / estRecordsPerStone, where
+// kRandomSamplesPerStone = 10
+// numRecords = kOplogDocs + some small number of bookkeeping records
+// estRecordsPerStone = (16MB / average oplog record size), empirically about 28700 records.
+// The number of samples is picked to NOT be divisible by kLoggingIntervalSeconds so we can
+// safely miss a logging interval without failing; this can sometimes happen due to clock
+// adjustment.
+const kNumOplogSamples = 16;
 const kOplogSampleReadDelay = 1;
 const kLoggingIntervalSeconds = 3;
 
@@ -32,8 +39,17 @@ replSet.initiate();
 let coll = replSet.getPrimary().getDB(testDB).getCollection("testcoll");
 
 // Insert enough documents to force kNumOplogSamples to be taken on the following start up.
-for (let i = 0; i < kOplogDocs; i++) {
-    assert.commandWorked(coll.insert({m: 1 + i}));
+let docsRemaining = kOplogDocs;
+let docsDone = 0;
+while (docsRemaining) {
+    let batchDocs = docsRemaining > 1000 ? 1000 : docsRemaining;
+    let bulk = coll.initializeUnorderedBulkOp();
+    for (let i = 0; i < batchDocs; i++) {
+        bulk.insert({m: 1 + i + docsDone});
+    }
+    assert.commandWorked(bulk.execute());
+    docsRemaining -= batchDocs;
+    docsDone += batchDocs;
 }
 
 // Restart replica set to load entries from the oplog for sampling.