From 6c9a46546c5af4d19e0f4f6eb6b311475a9f0b83 Mon Sep 17 00:00:00 2001
From: Matti Jauhiainen <matti.tapio.jauhiainen@gmail.com>
Date: Sun, 23 May 2021 14:42:32 +0800
Subject: [PATCH] fix: Use isMaster instead of hello to support older instances
 (#201)

---
 src/cluster.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/cluster.ts b/src/cluster.ts
index 9f8ce6a0..d7224f6f 100644
--- a/src/cluster.ts
+++ b/src/cluster.ts
@@ -100,10 +100,12 @@ export class Cluster {
     const results = await Promise.all(this.#protocols.map((protocol) => {
       return protocol.commandSingle(
         "admin",
-        { hello: 1 },
+        { isMaster: 1 },
       );
     }));
-    const masterIndex = results.findIndex((result) => result.isWritablePrimary);
+    const masterIndex = results.findIndex((result) =>
+      result.isWritablePrimary || result.ismaster
+    );
     if (masterIndex === -1) throw new Error(`Could not find a master node`);
     this.#masterIndex = masterIndex;
   }