SERVER-26772 removed old initial sync code

1 files changed, 65 insertions, 0 deletions

diff --git a/jstests/replsets/initial_sync_oplog_rollover.js b/jstests/replsets/initial_sync_oplog_rollover.js
new file mode 100644
index 00000000000..858b9d279d3
--- /dev/null
+++ b/jstests/replsets/initial_sync_oplog_rollover.js
@@ -0,0 +1,65 @@
+/**
+ * This test tests that initial sync succeeds when the sync source's oplog rolls over before the
+ * destination node reaches the oplog apply phase. It adds a new secondary to a replicaset and then
+ * pauses the initial sync before it copies the databases but after it starts to fetch and buffer
+ * oplog entries. The primary then fills up its oplog until it rolls over. At that point
+ * initial sync is resumed and we assert that it succeeds and that all of the inserted documents
+ * are there.
+ */
+
+(function() {
+    "use strict";
+    load("jstests/libs/check_log.js");
+
+    var name = 'initial_sync_oplog_rollover';
+    var replSet = new ReplSetTest({
+        name: name,
+        nodes: 1,
+    });
+
+    var oplogSizeOnPrimary = 1;  // size in MB
+    replSet.startSet({oplogSize: oplogSizeOnPrimary});
+    replSet.initiate();
+    var primary = replSet.getPrimary();
+
+    var coll = primary.getDB('test').foo;
+    assert.writeOK(coll.insert({a: 1}));
+
+    function getFirstOplogEntry(conn) {
+        return conn.getDB('local').oplog.rs.find().sort({ts: 1}).limit(1)[0];
+    }
+
+    var firstOplogEntry = getFirstOplogEntry(primary);
+
+    // Add a secondary node but make it hang before copying databases.
+    var secondary = replSet.add();
+    secondary.setSlaveOk();
+
+    assert.commandWorked(secondary.getDB('admin').runCommand(
+        {configureFailPoint: 'initialSyncHangBeforeCopyingDatabases', mode: 'alwaysOn'}));
+    replSet.reInitiate();
+
+    checkLog.contains(secondary,
+                      'initial sync - initialSyncHangBeforeCopyingDatabases fail point enabled');
+
+    // Keep inserting large documents until they roll over the oplog.
+    const largeStr = new Array(4 * 1024 * oplogSizeOnPrimary).join('aaaaaaaa');
+    var i = 0;
+    while (bsonWoCompare(getFirstOplogEntry(primary), firstOplogEntry) === 0) {
+        assert.writeOK(coll.insert({a: 2, x: i++, long_str: largeStr}));
+        sleep(100);
+    }
+
+    assert.commandWorked(secondary.getDB('admin').runCommand(
+        {configureFailPoint: 'initialSyncHangBeforeCopyingDatabases', mode: 'off'}));
+
+    replSet.awaitSecondaryNodes(200 * 1000);
+
+    assert.eq(i,
+              secondary.getDB('test').foo.count({a: 2}),
+              'collection successfully synced to secondary');
+
+    assert.eq(0,
+              secondary.getDB('local')['temp_oplog_buffer'].find().itcount(),
+              "Oplog buffer was not dropped after initial sync");
+})();