{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/25309115","id":25309115,"diff_hunk":"@@ -0,0 +1,228 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one or more\n+ * contributor license agreements.  See the NOTICE file distributed with\n+ * this work for additional information regarding copyright ownership.\n+ * The ASF licenses this file to You under the Apache License, Version 2.0\n+ * (the \"License\"); you may not use this file except in compliance with\n+ * the License.  You may obtain a 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\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package org.apache.spark.launcher;\n+\n+import java.io.File;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Map;\n+\n+/**\n+ * Helper methods for command builders.\n+ */\n+class CommandBuilderUtils {\n+\n+  static final String DEFAULT_MEM = \"512m\";\n+  static final String DEFAULT_PROPERTIES_FILE = \"spark-defaults.conf\";\n+  static final String ENV_SPARK_HOME = \"SPARK_HOME\";\n+\n+  /** Returns whether the given string is null or empty. */\n+  static boolean isEmpty(String s) {\n+    return s == null || s.isEmpty();\n+  }\n+\n+  /** Joins a list of strings using the given separator. */\n+  static String join(String sep, String... elements) {\n+    StringBuilder sb = new StringBuilder();\n+    for (String e : elements) {","path":"launcher/src/main/java/org/apache/spark/launcher/CommandBuilderUtils.java","position":42,"original_position":42,"commit_id":"c12d84bdf6b62ac5281833c6ce46ef867e34ce04","original_commit_id":"e2d4d717cee78de21aa9bdb60d524bbfd3aeb5fa","user":{"login":"vanzin","id":1694083,"avatar_url":"https://avatars.githubusercontent.com/u/1694083?v=3","gravatar_id":"","url":"https://api.github.com/users/vanzin","html_url":"https://github.com/vanzin","followers_url":"https://api.github.com/users/vanzin/followers","following_url":"https://api.github.com/users/vanzin/following{/other_user}","gists_url":"https://api.github.com/users/vanzin/gists{/gist_id}","starred_url":"https://api.github.com/users/vanzin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vanzin/subscriptions","organizations_url":"https://api.github.com/users/vanzin/orgs","repos_url":"https://api.github.com/users/vanzin/repos","events_url":"https://api.github.com/users/vanzin/events{/privacy}","received_events_url":"https://api.github.com/users/vanzin/received_events","type":"User","site_admin":false},"body":"`String[]` is not an `Iterable<String>`","created_at":"2015-02-25T00:47:55Z","updated_at":"2015-02-25T00:47:55Z","html_url":"https://github.com/apache/spark/pull/3916#discussion_r25309115","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/3916","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/25309115"},"html":{"href":"https://github.com/apache/spark/pull/3916#discussion_r25309115"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/3916"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/3916","id":26924003,"html_url":"https://github.com/apache/spark/pull/3916","diff_url":"https://github.com/apache/spark/pull/3916.diff","patch_url":"https://github.com/apache/spark/pull/3916.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/3916","number":3916,"state":"open","locked":false,"title":"[SPARK-4924] Add a library for launching Spark jobs programmatically.","user":{"login":"vanzin","id":1694083,"avatar_url":"https://avatars.githubusercontent.com/u/1694083?v=3","gravatar_id":"","url":"https://api.github.com/users/vanzin","html_url":"https://github.com/vanzin","followers_url":"https://api.github.com/users/vanzin/followers","following_url":"https://api.github.com/users/vanzin/following{/other_user}","gists_url":"https://api.github.com/users/vanzin/gists{/gist_id}","starred_url":"https://api.github.com/users/vanzin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vanzin/subscriptions","organizations_url":"https://api.github.com/users/vanzin/orgs","repos_url":"https://api.github.com/users/vanzin/repos","events_url":"https://api.github.com/users/vanzin/events{/privacy}","received_events_url":"https://api.github.com/users/vanzin/received_events","type":"User","site_admin":false},"body":"This change encapsulates all the logic involved in launching a Spark job\r\ninto a small Java library that can be easily embedded into other applications.\r\n\r\nThe overall goal of this change is twofold, as described in the bug:\r\n\r\n- Provide a public API for launching Spark processes. 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The change centralizes those\r\nas much as possible so that all code paths can rely on the library for\r\nhandling those appropriately.\r\n","created_at":"2015-01-06T22:40:31Z","updated_at":"2015-02-25T00:47:55Z","closed_at":null,"merged_at":null,"merge_commit_sha":"110415e1b372eb391a4b876b20f570c02871b2fc","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/3916/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/3916/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/3916/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/c12d84bdf6b62ac5281833c6ce46ef867e34ce04","head":{"label":"vanzin:SPARK-4924","ref":"SPARK-4924","sha":"c12d84bdf6b62ac5281833c6ce46ef867e34ce04","user":{"login":"vanzin","id":1694083,"avatar_url":"https://avatars.githubusercontent.com/u/1694083?v=3","gravatar_id":"","url":"https://api.github.com/users/vanzin","html_url":"https://github.com/vanzin","followers_url":"https://api.github.com/users/vanzin/followers","following_url":"https://api.github.com/users/vanzin/following{/other_user}","gists_url":"https://api.github.com/users/vanzin/gists{/gist_id}","starred_url":"https://api.github.com/users/vanzin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vanzin/subscriptions","organizations_url":"https://api.github.com/users/vanzin/orgs","repos_url":"https://api.github.com/users/vanzin/repos","events_url":"https://api.github.com/users/vanzin/events{/privacy}","received_events_url":"https://api.github.com/users/vanzin/received_events","type":"User","site_admin":false},"repo":{"id":18302272,"name":"spark","full_name":"vanzin/spark","owner":{"login":"vanzin","id":1694083,"avatar_url":"https://avatars.githubusercontent.com/u/1694083?v=3","gravatar_id":"","url":"https://api.github.com/users/vanzin","html_url":"https://github.com/vanzin","followers_url":"https://api.github.com/users/vanzin/followers","following_url":"https://api.github.com/users/vanzin/following{/other_user}","gists_url":"https://api.github.com/users/vanzin/gists{/gist_id}","starred_url":"https://api.github.com/users/vanzin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vanzin/subscriptions","organizations_url":"https://api.github.com/users/vanzin/orgs","repos_url":"https://api.github.com/users/vanzin/repos","events_url":"https://api.github.com/users/vanzin/events{/privacy}","received_events_url":"https://api.github.com/users/vanzin/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/vanzin/spark","description":"Mirror 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