{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/25554457","id":25554457,"diff_hunk":"@@ -0,0 +1,74 @@\n+/*\n+ * Copyright © 2015 Cask Data, Inc.\n+ *\n+ * Licensed under the Apache License, Version 2.0 (the \"License\"); you may not\n+ * use this file except in compliance with the License. You may obtain a copy of\n+ * the License at\n+ *\n+ * http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS, WITHOUT\n+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the\n+ * License for the specific language governing permissions and limitations under\n+ * the License.\n+ */\n+\n+package co.cask.cdap.data2.util;\n+\n+import co.cask.cdap.common.conf.Constants;\n+import co.cask.cdap.common.discovery.EndpointStrategy;\n+import co.cask.cdap.common.discovery.RandomEndpointStrategy;\n+import co.cask.cdap.common.namespace.AbstractNamespaceClient;\n+import co.cask.common.http.HttpRequest;\n+import co.cask.common.http.HttpRequests;\n+import co.cask.common.http.HttpResponse;\n+import com.google.common.base.Supplier;\n+import com.google.common.base.Suppliers;\n+import com.google.inject.Inject;\n+import org.apache.twill.discovery.Discoverable;\n+import org.apache.twill.discovery.DiscoveryServiceClient;\n+\n+import java.io.IOException;\n+import java.net.InetSocketAddress;\n+import java.net.MalformedURLException;\n+import java.net.URL;\n+import java.util.concurrent.TimeUnit;\n+\n+/**\n+ *\n+ */\n+public class DiscoveryNamespaceClient extends AbstractNamespaceClient {\n+  private final Supplier<EndpointStrategy> endpointStrategySupplier;\n+\n+  @Inject\n+  public DiscoveryNamespaceClient(final DiscoveryServiceClient discoveryClient) {\n+    this.endpointStrategySupplier = Suppliers.memoize(new Supplier<EndpointStrategy>() {\n+      @Override\n+      public EndpointStrategy get() {\n+        return new RandomEndpointStrategy(discoveryClient.discover(Constants.Service.APP_FABRIC_HTTP));\n+      }\n+    });\n+  }\n+\n+  @Override\n+  protected HttpResponse execute(HttpRequest request) throws IOException {\n+    return HttpRequests.execute(request);\n+  }\n+\n+  @Override\n+  protected URL resolve(String resource) throws MalformedURLException {\n+    InetSocketAddress addr = getNamespaceServiceAddress();\n+    String url = String.format(\"http://%s:%d%s/%s\", addr.getHostName(), addr.getPort(),\n+                               Constants.Gateway.API_VERSION_3, resource);\n+    return new URL(url);\n+  }\n+\n+  private InetSocketAddress getNamespaceServiceAddress() {\n+    Discoverable discoverable = endpointStrategySupplier.get().pick(3L, TimeUnit.SECONDS);\n+    if (discoverable != null) {\n+      return discoverable.getSocketAddress();\n+    }\n+    throw new RuntimeException(String.format(\"Cannot discover service %s\", Constants.Service.APP_FABRIC_HTTP));","path":"cdap-data-fabric/src/main/java/co/cask/cdap/data2/util/DiscoveryNamespaceClient.java","position":72,"original_position":72,"commit_id":"b602361476403aacf43aae97293aa88374b55dd1","original_commit_id":"b602361476403aacf43aae97293aa88374b55dd1","user":{"login":"bdmogal","id":3895099,"avatar_url":"https://avatars.githubusercontent.com/u/3895099?v=3","gravatar_id":"","url":"https://api.github.com/users/bdmogal","html_url":"https://github.com/bdmogal","followers_url":"https://api.github.com/users/bdmogal/followers","following_url":"https://api.github.com/users/bdmogal/following{/other_user}","gists_url":"https://api.github.com/users/bdmogal/gists{/gist_id}","starred_url":"https://api.github.com/users/bdmogal/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bdmogal/subscriptions","organizations_url":"https://api.github.com/users/bdmogal/orgs","repos_url":"https://api.github.com/users/bdmogal/repos","events_url":"https://api.github.com/users/bdmogal/events{/privacy}","received_events_url":"https://api.github.com/users/bdmogal/received_events","type":"User","site_admin":false},"body":"IllegalStateException?","created_at":"2015-02-28T05:06:39Z","updated_at":"2015-02-28T05:06:39Z","html_url":"https://github.com/caskdata/cdap/pull/1385#discussion_r25554457","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/1385","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/25554457"},"html":{"href":"https://github.com/caskdata/cdap/pull/1385#discussion_r25554457"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/1385"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/1385","id":29767588,"html_url":"https://github.com/caskdata/cdap/pull/1385","diff_url":"https://github.com/caskdata/cdap/pull/1385.diff","patch_url":"https://github.com/caskdata/cdap/pull/1385.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/1385","number":1385,"state":"open","locked":false,"title":"namespace client","user":{"login":"anwar6953","id":2440977,"avatar_url":"https://avatars.githubusercontent.com/u/2440977?v=3","gravatar_id":"","url":"https://api.github.com/users/anwar6953","html_url":"https://github.com/anwar6953","followers_url":"https://api.github.com/users/anwar6953/followers","following_url":"https://api.github.com/users/anwar6953/following{/other_user}","gists_url":"https://api.github.com/users/anwar6953/gists{/gist_id}","starred_url":"https://api.github.com/users/anwar6953/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/anwar6953/subscriptions","organizations_url":"https://api.github.com/users/anwar6953/orgs","repos_url":"https://api.github.com/users/anwar6953/repos","events_url":"https://api.github.com/users/anwar6953/events{/privacy}","received_events_url":"https://api.github.com/users/anwar6953/received_events","type":"User","site_admin":false},"body":"This is to allow namespace service interaction from streamAdmin/datasetManager \r\nhttps://issues.cask.co/browse/CDAP-1366\r\n\r\nQuestion: Should there be a namespaceExists() method? The handler in AppFabric does not expose such a method.\r\n\r\nBuild: http://builds.cask.co/browse/CDAP-DUT866-3","created_at":"2015-02-22T08:38:46Z","updated_at":"2015-02-28T05:06:39Z","closed_at":null,"merged_at":null,"merge_commit_sha":"e816313c90ed81c02a683c44eb79381d3a4dfa96","assignee":{"login":"bdmogal","id":3895099,"avatar_url":"https://avatars.githubusercontent.com/u/3895099?v=3","gravatar_id":"","url":"https://api.github.com/users/bdmogal","html_url":"https://github.com/bdmogal","followers_url":"https://api.github.com/users/bdmogal/followers","following_url":"https://api.github.com/users/bdmogal/following{/other_user}","gists_url":"https://api.github.com/users/bdmogal/gists{/gist_id}","starred_url":"https://api.github.com/users/bdmogal/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bdmogal/subscriptions","organizations_url":"https://api.github.com/users/bdmogal/orgs","repos_url":"https://api.github.com/users/bdmogal/repos","events_url":"https://api.github.com/users/bdmogal/events{/privacy}","received_events_url":"https://api.github.com/users/bdmogal/received_events","type":"User","site_admin":false},"milestone":{"url":"https://api.github.com/repos/caskdata/cdap/milestones/3","html_url":"https://github.com/caskdata/cdap/milestones/2.8.0","labels_url":"https://api.github.com/repos/caskdata/cdap/milestones/3/labels","id":944584,"number":3,"title":"2.8.0","description":null,"creator":{"login":"jwang47","id":1084704,"avatar_url":"https://avatars.githubusercontent.com/u/1084704?v=3","gravatar_id":"","url":"https://api.github.com/users/jwang47","html_url":"https://github.com/jwang47","followers_url":"https://api.github.com/users/jwang47/followers","following_url":"https://api.github.com/users/jwang47/following{/other_user}","gists_url":"https://api.github.com/users/jwang47/gists{/gist_id}","starred_url":"https://api.github.com/users/jwang47/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jwang47/subscriptions","organizations_url":"https://api.github.com/users/jwang47/orgs","repos_url":"https://api.github.com/users/jwang47/repos","events_url":"https://api.github.com/users/jwang47/events{/privacy}","received_events_url":"https://api.github.com/users/jwang47/received_events","type":"User","site_admin":false},"open_issues":14,"closed_issues":96,"state":"open","created_at":"2015-01-21T01:15:14Z","updated_at":"2015-02-28T00:23:14Z","due_on":null,"closed_at":null},"commits_url":"https://api.github.com/repos/caskdata/cdap/pulls/1385/commits","review_comments_url":"https://api.github.com/repos/caskdata/cdap/pulls/1385/comments","review_comment_url":"https://api.github.com/repos/caskdata/cdap/pulls/comments{/number}","comments_url":"https://api.github.com/repos/caskdata/cdap/issues/1385/comments","statuses_url":"https://api.github.com/repos/caskdata/cdap/statuses/b602361476403aacf43aae97293aa88374b55dd1","head":{"label":"caskdata:feature/ns-client","ref":"feature/ns-client","sha":"b602361476403aacf43aae97293aa88374b55dd1","user":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"repo":{"id":22542759,"name":"cdap","full_name":"caskdata/cdap","owner":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/caskdata/cdap","description":"Cask 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