{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/23592550","id":23592550,"diff_hunk":"@@ -0,0 +1,46 @@\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.examples.profiles;\n+\n+import co.cask.cdap.api.app.AbstractApplication;\n+import co.cask.cdap.api.data.stream.Stream;\n+import co.cask.cdap.api.dataset.DatasetProperties;\n+import co.cask.cdap.api.dataset.lib.KeyValueTable;\n+import co.cask.cdap.api.dataset.table.ConflictDetection;\n+import co.cask.cdap.api.dataset.table.Tables;\n+\n+/**\n+ * Demonstrates the use of column-level conflict detection by example of managing user profiles,\n+ * where attributes like name and email address avn be updated without conflicting with updates\n+ * to the last active time of the user.\n+ */\n+public class UserProfiles extends AbstractApplication {\n+\n+  @Override\n+  public void configure() {\n+    setName(\"UserProfiles\");\n+    setDescription(\"Demonstrates the use of column-level conflict detection.\");\n+    addService(new UserProfileService());\n+    addFlow(new ActivityFlow());\n+    addStream(new Stream(\"events\"));\n+    createDataset(\"counters\", KeyValueTable.class);\n+    createDataset(\"profiles\", \"table\",\n+                  Tables.tableProperties(ConflictDetection.COLUMN,  // column level\n+                                         -1,                        // no time-to-live","path":"cdap-examples/UserProfiles/src/main/java/co/cask/cdap/examples/profiles/UserProfiles.java","position":43,"original_position":43,"commit_id":"cdf5f60f1932c77f00e025ab8579808bfd0188df","original_commit_id":"54028f518cde1dd78ffa128e572030a62eec8617","user":{"login":"nitinmotgi","id":1365919,"avatar_url":"https://avatars.githubusercontent.com/u/1365919?v=3","gravatar_id":"","url":"https://api.github.com/users/nitinmotgi","html_url":"https://github.com/nitinmotgi","followers_url":"https://api.github.com/users/nitinmotgi/followers","following_url":"https://api.github.com/users/nitinmotgi/following{/other_user}","gists_url":"https://api.github.com/users/nitinmotgi/gists{/gist_id}","starred_url":"https://api.github.com/users/nitinmotgi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nitinmotgi/subscriptions","organizations_url":"https://api.github.com/users/nitinmotgi/orgs","repos_url":"https://api.github.com/users/nitinmotgi/repos","events_url":"https://api.github.com/users/nitinmotgi/events{/privacy}","received_events_url":"https://api.github.com/users/nitinmotgi/received_events","type":"User","site_admin":false},"body":":+1: ","created_at":"2015-01-27T08:18:47Z","updated_at":"2015-01-27T08:18:47Z","html_url":"https://github.com/caskdata/cdap/pull/1135#discussion_r23592550","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/1135","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/23592550"},"html":{"href":"https://github.com/caskdata/cdap/pull/1135#discussion_r23592550"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/1135"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/1135","id":28084370,"html_url":"https://github.com/caskdata/cdap/pull/1135","diff_url":"https://github.com/caskdata/cdap/pull/1135.diff","patch_url":"https://github.com/caskdata/cdap/pull/1135.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/1135","number":1135,"state":"open","locked":false,"title":"[CDAP-1016] add an example that avoid conflicts by using column level detection","user":{"login":"anew","id":483004,"avatar_url":"https://avatars.githubusercontent.com/u/483004?v=3","gravatar_id":"","url":"https://api.github.com/users/anew","html_url":"https://github.com/anew","followers_url":"https://api.github.com/users/anew/followers","following_url":"https://api.github.com/users/anew/following{/other_user}","gists_url":"https://api.github.com/users/anew/gists{/gist_id}","starred_url":"https://api.github.com/users/anew/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/anew/subscriptions","organizations_url":"https://api.github.com/users/anew/orgs","repos_url":"https://api.github.com/users/anew/repos","events_url":"https://api.github.com/users/anew/events{/privacy}","received_events_url":"https://api.github.com/users/anew/received_events","type":"User","site_admin":false},"body":"This application maintains user profiles.\r\n\r\n- It allows to update the last login time (through a service) and the last active time (through a flow that reads events by userid) for a user separately. \r\n- Two scripts are included, one that makes calls to the service to update the login time, one that sends events to the flow via a stream.\r\n- When both scripts run concurrently, we would get conflicts at the row level. But this app uses column-level conflict detection\r\n\r\nThis PR includes the app itself plus the scripts. I will add the documentation (Readme, plus a couple of paragraphs of text in the dev guide) in a follow-up 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