{"id":1973,"date":"2026-03-05T12:30:23","date_gmt":"2026-03-05T11:30:23","guid":{"rendered":"https:\/\/askem.eu\/?p=1973"},"modified":"2026-03-06T09:01:16","modified_gmt":"2026-03-06T08:01:16","slug":"apache-iceberg-et-polaris-le-catalogue-ouvert-pour-vos-donnees","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/03\/05\/apache-iceberg-et-polaris-le-catalogue-ouvert-pour-vos-donnees\/","title":{"rendered":"Apache Iceberg et Polaris : le catalogue ouvert pour vos donn\u00e9es"},"content":{"rendered":"<h1 class=\"wp-block-heading\">Apache Iceberg et Polaris&nbsp;: le catalogue ouvert pour vos donn\u00e9es<\/h1>\n\n\n\n<p>Comment structurer un lac de donn\u00e9es interop\u00e9rable avec des formats ouverts \u2014 et pourquoi c&rsquo;est important pour les portails open data.<\/p>\n\n\n\n<p>Infrastructure \u00b7 Donn\u00e9es ouvertes \u00b7 Open source<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Le probl\u00e8me des silos de donn\u00e9es<\/h2>\n\n\n\n<p>Les organisations qui publient ou g\u00e8rent des donn\u00e9es structur\u00e9es se heurtent rapidement \u00e0 la m\u00eame limite&nbsp;: chaque outil lit ses propres formats, dans son propre d\u00e9p\u00f4t. Une export CSV ici, un dump Postgres l\u00e0, un entrep\u00f4t Parquet ailleurs. R\u00e9sultat&nbsp;: les donn\u00e9es ne peuvent pas \u00eatre interrog\u00e9es de fa\u00e7on unifi\u00e9e, les m\u00e9tadonn\u00e9es sont dispers\u00e9es, et la tra\u00e7abilit\u00e9 des versions dispara\u00eet.<\/p>\n\n\n\n<p>C&rsquo;est pr\u00e9cis\u00e9ment le probl\u00e8me qu&rsquo;Apache Iceberg cherche \u00e0 r\u00e9soudre. Il propose un <strong>format de table ouvert<\/strong> qui s&rsquo;intercale entre le stockage objet (S3, MinIO, Azure Blob\u2026) et les moteurs de requ\u00eate (Spark, DuckDB, Trino, Flink\u2026), en ajoutant une couche de catalogue et de versionnage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ce qu&rsquo;est Apache Iceberg<\/h2>\n\n\n\n<p>Apache Iceberg est une sp\u00e9cification de table pour les grands ensembles de donn\u00e9es stock\u00e9s en fichiers. Il ne remplace pas votre moteur de calcul&nbsp;: il d\u00e9finit <em>comment<\/em> les donn\u00e9es et leurs m\u00e9tadonn\u00e9es sont organis\u00e9es sur le disque ou dans un stockage objet, de fa\u00e7on \u00e0 ce que n&rsquo;importe quel moteur compatible puisse les lire correctement.<\/p>\n\n\n\n<p>Concr\u00e8tement, une table Iceberg est compos\u00e9e de&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fichiers de donn\u00e9es<\/strong>&nbsp;: au format Parquet, ORC ou Avro, stock\u00e9s dans un dossier.<\/li>\n\n\n\n<li><strong>Fichiers de manifeste<\/strong>&nbsp;: listes des fichiers appartenant \u00e0 un snapshot donn\u00e9.<\/li>\n\n\n\n<li><strong>Fichier de m\u00e9tadonn\u00e9es<\/strong>&nbsp;: d\u00e9crit le sch\u00e9ma, les partitions, l&rsquo;historique des snapshots.<\/li>\n\n\n\n<li><strong>Pointeur de catalogue<\/strong>&nbsp;: indique quel snapshot est le courant.<\/li>\n<\/ul>\n\n\n\n<p>Cette architecture permet des fonctionnalit\u00e9s que les fichiers Parquet bruts n&rsquo;offrent pas&nbsp;: <strong>time travel<\/strong> (lire les donn\u00e9es \u00e0 une date pass\u00e9e), rollback, sch\u00e9ma \u00e9volutif, et partition pruning efficace sans scanner tous les fichiers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Polaris&nbsp;: le catalogue REST pour Iceberg<\/h2>\n\n\n\n<p>Un catalogue est le registre qui dit \u00e0 un moteur \u00ab\u00a0la table <code>communes<\/code> se trouve \u00e0 cet emplacement, avec ce sch\u00e9ma\u00a0\u00bb. Sans catalogue, chaque moteur doit conna\u00eetre le chemin exact des fichiers.<\/p>\n\n\n\n<p><strong>Apache Polaris<\/strong> (anciennement Snowflake Open Catalog, maintenant sous Apache) est un serveur de catalogue REST conforme \u00e0 la sp\u00e9cification <em>Iceberg REST Catalog API<\/em>. Il expose des endpoints HTTP standardis\u00e9s que tout moteur compatible Iceberg peut interroger pour d\u00e9couvrir et g\u00e9rer les tables.<\/p>\n\n\n\n<p>Son avantage principal&nbsp;: il est <strong>ind\u00e9pendant du moteur<\/strong>. Que vous utilisiez DuckDB localement, Spark sur un cluster, ou Trino dans un environnement conteneuris\u00e9, tous parlent le m\u00eame protocole REST et lisent les m\u00eames tables.<\/p>\n\n\n\n<p>Polaris peut se d\u00e9ployer en Docker, se connecter \u00e0 un stockage S3 ou MinIO, et \u00eatre administr\u00e9 via une API REST. C&rsquo;est une brique r\u00e9aliste pour un portail open data qui veut exposer ses donn\u00e9es de fa\u00e7on interop\u00e9rable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">D\u00e9marrer avec Polaris en Docker<\/h2>\n\n\n\n<p>Polaris fournit une image Docker officielle. Un d\u00e9ploiement minimal se fait ainsi&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Lancer Polaris avec stockage local (pour les tests)\ndocker run -p 8181:8181 \\\n  -e AWS_ACCESS_KEY_ID=minioadmin \\\n  -e AWS_SECRET_ACCESS_KEY=minioadmin \\\n  apache\/polaris:latest<\/code><\/pre>\n\n\n\n<p>Le service \u00e9coute sur le port <code>8181<\/code> et expose l&rsquo;API REST Iceberg. Pour le connecter \u00e0 MinIO (\u00e9quivalent S3 auto-h\u00e9berg\u00e9)&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>version: \"3.9\"\nservices:\n  minio:\n    image: minio\/minio\n    command: server \/data --console-address \":9001\"\n    ports: &#91;\"9000:9000\", \"9001:9001\"]\n    environment:\n      MINIO_ROOT_USER: minioadmin\n      MINIO_ROOT_PASSWORD: minioadmin\n\n  polaris:\n    image: apache\/polaris:latest\n    ports: &#91;\"8181:8181\"]\n    environment:\n      AWS_ACCESS_KEY_ID: minioadmin\n      AWS_SECRET_ACCESS_KEY: minioadmin\n      AWS_REGION: us-east-1\n      POLARIS_S3_ENDPOINT: http:\/\/minio:9000<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Lire une table Iceberg avec DuckDB<\/h2>\n\n\n\n<p>Une fois vos tables Iceberg enregistr\u00e9es dans Polaris, DuckDB peut les interroger directement via l&rsquo;extension <code>iceberg<\/code>&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-- Installation de l'extension\nINSTALL iceberg;\nLOAD iceberg;\n\n-- Lecture d'une table Iceberg depuis MinIO\nSELECT *\nFROM iceberg_scan(\n  's3:\/\/mon-bucket\/tables\/communes\/',\n  endpoint_url='http:\/\/localhost:9000',\n  key_id='minioadmin',\n  secret='minioadmin'\n)\nLIMIT 10;<\/code><\/pre>\n\n\n\n<p>Le m\u00eame fichier Parquet sous-jacent peut \u00eatre lu simultan\u00e9ment par Spark, Trino ou DuckDB \u2014 sans conflit, car Iceberg g\u00e8re l&rsquo;isolation des snapshots.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Iceberg et les portails open data<\/h2>\n\n\n\n<p>Pour un portail CKAN, Iceberg ouvre des perspectives int\u00e9ressantes. Plut\u00f4t que de stocker des exports CSV versionn\u00e9s manuellement, on peut exposer directement des tables Iceberg comme ressources. Un utilisateur pourrait ainsi interroger l&rsquo;historique complet d&rsquo;un jeu de donn\u00e9es (time travel), ou recevoir automatiquement la version la plus r\u00e9cente via un moteur SQL.<\/p>\n\n\n\n<p>Des projets comme <strong>CKAN + DuckDB<\/strong> ou <strong>CKAN + Parquet endpoints<\/strong> vont dans ce sens. Iceberg fournit la fondation pour aller plus loin&nbsp;: interop\u00e9rabilit\u00e9 des moteurs, gouvernance des versions, et compatibilit\u00e9 avec des standards comme le <em>GeoParquet<\/em> pour les donn\u00e9es g\u00e9ographiques.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Points de vigilance<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Iceberg et Polaris sont encore en phase de maturit\u00e9&nbsp;: la spec REST Catalog est stable, mais l&rsquo;\u00e9cosyst\u00e8me autour (s\u00e9curit\u00e9, RBAC, multi-tenant) est en \u00e9volution rapide.<\/li>\n\n\n\n<li>Le d\u00e9ploiement de Polaris n\u00e9cessite un stockage objet fiable (MinIO en production, pas juste local).<\/li>\n\n\n\n<li>DuckDB est id\u00e9al pour l&rsquo;exploration locale&nbsp;; pour des volumes importants en production, Trino ou Spark restent plus adapt\u00e9s.<\/li>\n\n\n\n<li>L&rsquo;int\u00e9gration native avec CKAN n&rsquo;est pas encore standardis\u00e9e&nbsp;: il faut un adaptateur custom ou une couche API interm\u00e9diaire.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Pour aller plus loin<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/iceberg.apache.org\/docs\/latest\/\" target=\"_blank\" rel=\"noreferrer noopener\">Documentation Apache Iceberg<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/polaris.apache.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">Apache Polaris (catalogue REST)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/duckdb.org\/docs\/extensions\/iceberg\" target=\"_blank\" rel=\"noreferrer noopener\">Extension Iceberg pour DuckDB<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/geoparquet.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">GeoParquet \u2014 Parquet pour les donn\u00e9es g\u00e9ographiques<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Apache Iceberg et Polaris&nbsp;: le catalogue ouvert pour vos donn\u00e9es Comment structurer un lac de donn\u00e9es interop\u00e9rable avec des formats ouverts \u2014 et pourquoi c&rsquo;est important pour les portails open data. Infrastructure \u00b7 Donn\u00e9es ouvertes \u00b7 Open source Le probl\u00e8me des silos de donn\u00e9es Les organisations qui publient ou g\u00e8rent des donn\u00e9es structur\u00e9es se heurtent [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1974,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[17],"tags":[],"class_list":["post-1973","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Apache Iceberg et Polaris : le catalogue ouvert pour vos donn\u00e9es - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D&#039;\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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