<fix>[zbs]: enable tryNext and 30s timeout for getActiveClients MDS call

When anti-split-brain check selects a disconnected MDS node, the HTTP
call now times out after 30s instead of 5+ minutes, and automatically
retries the next available MDS via tryNext mechanism.

Resolves: ZSTAC-80595

Change-Id: I1be80f1b70cad1606eb38d1f0078c8f2781e6941

Author: AlanJager

plugin/zbs/src/main/java/org/zstack/storage/zbs/ZbsStorageController.java

@@ -179,7 +179,10 @@ public List<ActiveVolumeClient> getActiveClients(String installPath, String prot
         if (VolumeProtocol.CBD.toString().equals(protocol)) {
             GetVolumeClientsCmd cmd = new GetVolumeClientsCmd();
             cmd.setPath(installPath);
-            GetVolumeClientsRsp rsp = syncHttpCall(GET_VOLUME_CLIENTS_PATH, cmd, GetVolumeClientsRsp.class);
+            GetVolumeClientsRsp rsp = new HttpCaller<>(GET_VOLUME_CLIENTS_PATH, cmd, GetVolumeClientsRsp.class,
+                    null, TimeUnit.SECONDS, 30, true)
+                    .setTryNext(true)
+                    .syncCall();
             List<ActiveVolumeClient> clients = new ArrayList<>();
 
             if (!rsp.isSuccess()) {
@@ -1411,6 +1414,11 @@ public class HttpCaller<T extends AgentResponse> {
 
         private boolean tryNext = false;
 
+        HttpCaller<T> setTryNext(boolean tryNext) {
+            this.tryNext = tryNext;
+            return this;
+        }
+
         public HttpCaller(String path, AgentCommand cmd, Class<T> retClass, ReturnValueCompletion<T> callback) {
             this(path, cmd, retClass, callback, null, 0, false);
         }