SERVER-45719 Set failpoint to allow test fuzzer to allow FCV 4.2 downgrade in the presence of compound hashed shard key

1 files changed, 14 insertions, 0 deletions

diff --git a/jstests/hooks/run_validate_collections.js b/jstests/hooks/run_validate_collections.js
index eeabba7e10e..12104210f23 100644
--- a/jstests/hooks/run_validate_collections.js
+++ b/jstests/hooks/run_validate_collections.js
@@ -21,6 +21,13 @@ if (topology.type === Topology.kStandalone) {
 } else if (topology.type === Topology.kShardedCluster) {
     hostList.push(...topology.configsvr.nodes);
 
+    // Set the fail point on config server to allow FCV downgrade even in the presence of a
+    // collection sharded on a compound hashed key.
+    // TODO SERVER-45489: Delete this logic after branching for 4.4.
+    const configSvrConn = new Mongo(topology.configsvr.primary);
+    assert.commandWorked(configSvrConn.getDB('admin').runCommand(
+        {configureFailPoint: "allowFCVDowngradeWithCompoundHashedShardKey", mode: "alwaysOn"}));
+
     for (let shardName of Object.keys(topology.shards)) {
         const shard = topology.shards[shardName];
 
@@ -39,4 +46,11 @@ if (topology.type === Topology.kStandalone) {
 }
 
 new CollectionValidator().validateNodes(hostList, setFCVHost);
+
+// Disable the failpoint that was set earlier on sharded clusters.
+if (topology.type === Topology.kShardedCluster) {
+    const configSvrConn = new Mongo(topology.configsvr.primary);
+    assert.commandWorked(configSvrConn.getDB('admin').runCommand(
+        {configureFailPoint: "allowFCVDowngradeWithCompoundHashedShardKey", mode: "off"}));
+}
 })();