November 2024
Intermediate to advanced
194 pages
5h 10m
French
Content preview from Apprendre et utiliser Presto
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Chapitre 4. Connectivité du client
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Un client Presto est un processus qui interroge Presto et montre les résultats de la requête pour un certain nombre d'objectifs, tels que l'analyse de données, les requêtes ad hoc, et bien d'autres. Presto fournit une variété de clients, écrits dans différents langages de programmation, notamment l'API REST, R, Python, JDBC, Node.js et ODBC.
Ce chapitre est organisé en deux parties : dans la première, tu apprendras à déployer un client Presto. Bien que tu puisses déployer un client Presto en tant que processus distinct s'exécutant sur un nœud de cluster existant, dans ce chapitre, tu mettras en œuvre le client sur un nœud différent pour simuler une application externe accédant au cluster. Nous nous concentrerons sur la mise en œuvre d'un client dans l'API REST, Python, R, JDBC, Node.js et ODBC. Tu peux facilement étendre la procédure décrite aux autres langages de programmation pris en charge par Presto.
Dans la deuxième partie, tu mettras en œuvre un service web pratique en Python, en interrogeant Presto et en affichant les résultats dans un tableau de bord simple. Le but de cet exemple est d'illustrer les potentialités d'un client Presto.
Mise en place de l'environnement
Pour ajouter un client Presto en tant que nœud du cluster Presto, tu dois d'abord configurer l'environnement. Déploie les trois composants suivants ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.