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  1. Couchbase Java Client
  2. JCBC-1532

When cluster do not have enough data servers to support number of replicas, getAllReplicas request from Java SDK stuck until the configured kvTimeout

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Details

    • Bug
    • Resolution: Not a Bug
    • Critical
    • 3.0.0
    • 3.0.0-beta.1
    • Core
    • 6.5.0-4908
      SDK: 3.0.0-beta.1

    Description

      1. Create a cluster with 2 nodes and a default bucket with replica=2
      2. Load some data. 1 doc("test_docs-0") is also fine to test this issue.
      3. Do a "getAllReplicas" for that key through Java SDK
      4. Get from SDK is not released until the configured kvTimeout

      Java Code to read from all replicas:

      env = ClusterEnvironment.builder().timeoutConfig(TimeoutConfig.builder().kvTimeout(Duration.ofSeconds(5))).build();
      ClusterOptions opt = ClusterOptions.clusterOptions("Administrator", "password").environment(env);
       
      cluster = Cluster.connect("10.112.180.101",opt);
      bucket = cluster.bucket("default");
      collection = bucket.defaultCollection();
       
      long startTime;
      long stopTime;
       
      while(true) {
      	startTime = System.nanoTime();
      	Stream<GetReplicaResult> replica = collection.getAllReplicas("test_docs-0", GetAllReplicasOptions.getAllReplicasOptions());
      	replica.forEach(item ->{
      		System.out.println(item.contentAsObject());
      	});
      	stopTime = System.nanoTime();
      	System.out.println(Integer.toString(i++) + ": " +  TimeUnit.NANOSECONDS.toSeconds(stopTime - startTime));
      }
      

      5. Change the kvTimeout to 20s and observe that now the getAllReplicas is released after 20s.
      6. While the above script is running, change the bucket replica to 1 and observe that getAllReplicas started working as fast as possible.

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            graham.pople Graham Pople
            ritesh.agarwal Ritesh Agarwal
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              Updated:
              Resolved:

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