[GitHub] [skywalking] SataQiu commented on a change in pull request #2756: mongodb-3.x-plugin: add support for previous versions of 3.3

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SataQiu commented on a change in pull request #2756: mongodb-3.x-plugin: add support for previous versions of 3.3
URL: https://github.com/apache/skywalking/pull/2756#discussion_r287594615
 
 

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 File path: apm-sniffer/apm-sdk-plugin/mongodb-3.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/mongodb/v3/MongoDBMethodInterceptor.java
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 @@ -201,7 +201,13 @@ private String limitFilter(String filter) {
     public void onConstruct(EnhancedInstance objInst, Object[] allArguments) {
         Cluster cluster = (Cluster)allArguments[0];
         StringBuilder peers = new StringBuilder();
-        for (ServerDescription description : cluster.getDescription().getServerDescriptions()) {
+        Collection<ServerDescription> descriptions;
+        try {
+            descriptions = cluster.getDescription().getServerDescriptions();
+        } catch (Throwable t) {
+            descriptions = cluster.getDescription().getAll();
 
 Review comment:
   Thanks for your feeedback @wu-sheng 
   I think I need to refer to some current code about witness class.
   Any example code for using witness class?
   

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