{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/22733838","id":22733838,"diff_hunk":"@@ -0,0 +1,39 @@\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.data.stream.service;\n+\n+import com.google.common.util.concurrent.ListenableFuture;\n+import com.google.common.util.concurrent.Service;\n+import org.apache.twill.discovery.Discoverable;\n+\n+/**\n+ * Manages Streams leaders. One Stream handler leader is affected to every Stream. The leader can perform 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