{"action":"created","comment":{"url":"https://api.github.com/repos/amplab/tachyon/pulls/comments/40506424","id":40506424,"diff_hunk":"@@ -0,0 +1,173 @@\n+/*\n+ * Licensed to the University of California, Berkeley under one or more contributor license\n+ * agreements. See the NOTICE file distributed with this work for additional information regarding\n+ * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the\n+ * \"License\"); you may not use this file except in compliance with the License. You may obtain a\n+ * copy of 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 distributed under the License\n+ * is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express\n+ * or implied. See the License for the specific language governing permissions and limitations under\n+ * the License.\n+ */\n+\n+package tachyon.client.lineage;\n+\n+import java.io.IOException;\n+import java.util.List;\n+\n+import org.slf4j.Logger;\n+import org.slf4j.LoggerFactory;\n+\n+import com.google.common.base.Preconditions;\n+\n+import tachyon.Constants;\n+import tachyon.TachyonURI;\n+import tachyon.annotation.PublicApi;\n+import tachyon.client.file.FileOutStream;\n+import tachyon.client.file.TachyonFileSystem;\n+import tachyon.client.file.options.OutStreamOptions;\n+import tachyon.exception.TachyonException;\n+import tachyon.job.CommandLineJob;\n+import tachyon.job.Job;\n+import tachyon.thrift.FileDoesNotExistException;\n+import tachyon.thrift.LineageDeletionException;\n+import tachyon.thrift.LineageDoesNotExistException;\n+import tachyon.thrift.LineageInfo;\n+\n+/**\n+ * Tachyon lineage client. This class is the entry point for all lineage related operations. An\n+ * instance of this class can be obtained via {@link TachyonLineageFileSystem#get}.\n+ */\n+@PublicApi\n+public class TachyonLineageFileSystem extends TachyonFileSystem {\n+  private static final Logger LOG = LoggerFactory.getLogger(Constants.LOGGER_TYPE);\n+\n+  private static TachyonLineageFileSystem sTachyonFileSystem;\n+  private LineageContext mContext;\n+\n+  public static synchronized TachyonLineageFileSystem get() {\n+    if (sTachyonFileSystem == null) {\n+      sTachyonFileSystem = new TachyonLineageFileSystem();\n+    }\n+    return sTachyonFileSystem;\n+  }\n+\n+  protected TachyonLineageFileSystem() {\n+    super();\n+    mContext = LineageContext.INSTANCE;\n+  }\n+\n+  /**\n+   * Creates a lineage. It requires all the input files must either exist in Tachyon storage, 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