SERVER-88864 Make nodes_eventually_sync_from_closer_data_center.js more robust to transient slow heartbeats (#20677)r7.0.9-rc0

GitOrigin-RevId: d1e1ef429d689240089187289fd6a379a282c325
(cherry picked from commit 0348832e0d5796ff6f70f84827e832b691027f26)

1 files changed, 7 insertions, 1 deletions

diff --git a/jstests/replsets/nodes_eventually_sync_from_closer_data_center.js b/jstests/replsets/nodes_eventually_sync_from_closer_data_center.js
index 8ba24bdaa9b..c29e7705614 100644
--- a/jstests/replsets/nodes_eventually_sync_from_closer_data_center.js
+++ b/jstests/replsets/nodes_eventually_sync_from_closer_data_center.js
@@ -105,7 +105,13 @@ assert.soon(() => {
     const syncSourcePingTime = replSetGetStatus.members[0].pingMs;
     const receivedSyncSourceHb = (syncSourcePingTime > 60);
 
-    return (receivedCentralHb && receivedSyncSourceHb);
+    // Wait for enough heartbeat's from the desired sync source so that our understanding of the
+    // ping time to that node is at least 'changeSyncSourceThresholdMillis' less than the ping time
+    // to our current sync source.
+    const centralSecondaryPingTime = replSetGetStatus.members[1].pingMs;
+    const exceedsChangeSyncSourceThreshold = (syncSourcePingTime - centralSecondaryPingTime > 5);
+
+    return (receivedCentralHb && receivedSyncSourceHb && exceedsChangeSyncSourceThreshold);
 });
 
 const replSetGetStatus = assert.commandWorked(testNode.adminCommand({replSetGetStatus: 1}));