By Carlos A. Ruggiero, John Sargeant (auth.), Gilles Kahn (eds.)

ISBN-10: 3540183175

ISBN-13: 9783540183174

This quantity comprises the court cases of the 3rd convention on sensible Programming Languages and laptop structure held in Portland, Oregon, September 14-16, 1987. This convention was once a successor to 2 hugely profitable meetings at the comparable themes held at Wentworth, New Hampshire, in October 1981 and in Nancy, in September 1985. Papers have been solicited on all facets of sensible languages and especially implementation concepts for sensible programming languages and machine architectures to help the effective execution of useful courses. The contributions accumulated during this quantity convey that many concerns in regards to the implementation of practical Programming Languages are actually much better understood.

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The second component drops the existing tweets table by using the following command: DROP TABLE IF EXISTS tweets 3. username+"/packt/chp02 4. We set the delimiter to the semicolon, and the data location to the directory where we have written the tweets file. 5. Connect the component by right-clicking on it and choosing onComponent Ok for each of them. At the end, your Job should look as follows: Hive creates tweets table [ 34 ] Chapter 3 Checking in Hive if the table has been created is pretty easy; just open a terminal in your Cloudera VM and issue the following commands: • $ hive: This command connects to the Hive server and opens the Hive command-line tool • $ use default: This command selects the database • $ desc tweets: This command shows tweets table description and prints the following information: The Hive tweet table's description Formatting tweets with Apache Hive In this last part of the Hive integration process, we now need to create a formatted tweet table and separate the content into the following two parts: • The effective content of the tweet • The username of the tweet author We are doing this because so far we only have the merged content and we couldn't determine who is the most active user on a specific topic.

2. Double-click on the tHiveConnection component. 3. hdfsPort [ 33 ] Formatting Data You may have noticed that we need to install a JAR file to be able to use the tHiveConnection component; just click on the Install Jar button and follow the instructions. Now that our Hive connection is properly configured, we can use this connection for each tHiveRow component by performing the following steps: 1. Double-click on the component. 2. In the property view, check the Use an existing connection checkbox.

Modify the third tHiveRow component and change the dropped table name using the following command: DROP TABLE IF EXISTS formatted_tweets [ 35 ] Formatting Data 3. username+"/ packt/chp02/formatedTweets" So far, we only have the part that creates a formatted_tweets table over HDFS, but we need to use the Talend Hive ELT features to feed the formatted tweets HDFS folder. This is done by performing the following steps: 1. From the palette, drag-and-drop a tHiveELTInput component, a tHiveELTMap component, and a tHiveELTOutput component.

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Functional Programming Languages and Computer Architecture: Portland, Oregon, USA, September 14–16, 1987 Proceedings by Carlos A. Ruggiero, John Sargeant (auth.), Gilles Kahn (eds.)


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