{"id":2053,"date":"2026-03-09T09:27:37","date_gmt":"2026-03-09T08:27:37","guid":{"rendered":"https:\/\/askem.eu\/?p=2053"},"modified":"2026-03-09T09:27:57","modified_gmt":"2026-03-09T08:27:57","slug":"apache-iceberg-vers-un-lakehouse-pour-les-donnees-ouvertes","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/03\/09\/apache-iceberg-vers-un-lakehouse-pour-les-donnees-ouvertes\/","title":{"rendered":"Apache Iceberg : vers un lakehouse pour les donnees ouvertes"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Apache Iceberg&nbsp;: vers un lakehouse pour les donn\u00e9es ouvertes<\/h2>\n\n\n\n<p>Les portails de donn\u00e9es ouvertes reposent encore largement sur des formats statiques \u2014 CSV, JSON, GeoJSON \u2014 distribu\u00e9s fichier par fichier. Cette approche, h\u00e9rit\u00e9e des d\u00e9buts de l&rsquo;open data, montre ses limites face \u00e0 l&rsquo;explosion des volumes, aux besoins de versioning et \u00e0 l&rsquo;exigence croissante de requ\u00eates analytiques performantes. Apache Iceberg, format de table ouvert con\u00e7u pour le lakehouse, apporte une r\u00e9ponse structurante \u00e0 ces probl\u00e9matiques.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Qu&rsquo;est-ce qu&rsquo;Apache Iceberg&nbsp;?<\/h3>\n\n\n\n<p>Apache Iceberg est un format de table open source, initialement d\u00e9velopp\u00e9 par Netflix, qui fonctionne au-dessus de syst\u00e8mes de stockage objet (S3, MinIO, HDFS). Contrairement aux formats plats, Iceberg g\u00e8re nativement le sch\u00e9ma, le partitionnement, le versioning des donn\u00e9es et les transactions ACID. Il s\u00e9pare clairement les m\u00e9tadonn\u00e9es de la donn\u00e9e elle-m\u00eame, ce qui permet des op\u00e9rations comme le <em>time travel<\/em> (interroger les donn\u00e9es \u00e0 un instant T pass\u00e9) ou l&rsquo;\u00e9volution de sch\u00e9ma sans r\u00e9\u00e9criture compl\u00e8te.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pourquoi c&rsquo;est pertinent pour l&rsquo;open data<\/h3>\n\n\n\n<p>Dans un contexte de portail de donn\u00e9es ouvertes \u2014 typiquement CKAN coupl\u00e9 \u00e0 un datastore \u2014 les jeux de donn\u00e9es volumineux posent des probl\u00e8mes r\u00e9currents&nbsp;: temps de chargement via xloader, absence de versioning exploitable, impossibilit\u00e9 de requ\u00eates analytiques complexes sans ETL pr\u00e9alable. Iceberg r\u00e9pond \u00e0 plusieurs de ces irritants&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Versioning natif&nbsp;:<\/strong> chaque modification d&rsquo;un jeu de donn\u00e9es produit un snapshot immutable. Les consommateurs peuvent acc\u00e9der \u00e0 n&rsquo;importe quelle version sans duplication de fichiers.<\/li>\n\n\n\n<li><strong>Requ\u00eates performantes&nbsp;:<\/strong> gr\u00e2ce au partitionnement cach\u00e9 (<em>hidden partitioning<\/em>) et aux statistiques de colonnes int\u00e9gr\u00e9es aux m\u00e9tadonn\u00e9es, les moteurs de requ\u00eate (Trino, Spark, DuckDB) peuvent \u00e9laguer efficacement les donn\u00e9es sans scanner l&rsquo;int\u00e9gralit\u00e9 du dataset.<\/li>\n\n\n\n<li><strong>\u00c9volution de sch\u00e9ma&nbsp;:<\/strong> ajouter ou renommer une colonne ne casse pas les consommateurs existants. Le format g\u00e8re la compatibilit\u00e9 ascendante de mani\u00e8re transparente.<\/li>\n\n\n\n<li><strong>Interop\u00e9rabilit\u00e9&nbsp;:<\/strong> Iceberg est support\u00e9 par un \u00e9cosyst\u00e8me large \u2014 Trino, Spark, Flink, DuckDB, Polaris (catalogue REST) \u2014 ce qui \u00e9vite le verrouillage technologique.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Architecture type avec CKAN et Iceberg<\/h3>\n\n\n\n<p>Une architecture r\u00e9aliste pour un portail open data moderne pourrait combiner CKAN comme interface de catalogage et de publication, MinIO ou S3 comme stockage objet, Apache Iceberg comme format de table pour les jeux de donn\u00e9es volumineux, et Polaris comme catalogue REST pour exposer les tables Iceberg. Le flux serait le suivant&nbsp;: les producteurs de donn\u00e9es publient via CKAN, un pipeline d&rsquo;ingestion (via Airflow, dagster ou un simple script Python avec PyIceberg) convertit les donn\u00e9es en tables Iceberg sur le stockage objet, et les consommateurs interrogent directement via Trino ou DuckDB sans passer par l&rsquo;API CKAN pour les requ\u00eates analytiques.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Limites et points d&rsquo;attention<\/h3>\n\n\n\n<p>Iceberg n&rsquo;est pas une solution universelle. Pour des jeux de donn\u00e9es l\u00e9gers (quelques milliers de lignes), le surco\u00fbt en m\u00e9tadonn\u00e9es et en infrastructure n&rsquo;est pas justifi\u00e9. Le format suppose \u00e9galement une comp\u00e9tence data engineering minimale pour la mise en place du catalogue et des pipelines d&rsquo;ingestion. Enfin, l&rsquo;int\u00e9gration avec CKAN n&rsquo;est pas native et n\u00e9cessite un d\u00e9veloppement sp\u00e9cifique \u2014 extension CKAN, connecteur ou middleware d\u00e9di\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">En pratique&nbsp;: premiers pas<\/h3>\n\n\n\n<p>Pour exp\u00e9rimenter, le chemin le plus court consiste \u00e0 utiliser PyIceberg avec un catalogue SQLite local et un stockage fichier. En quelques lignes de Python, on peut cr\u00e9er une table, y ins\u00e9rer des donn\u00e9es, faire \u00e9voluer le sch\u00e9ma et interroger des snapshots pass\u00e9s. DuckDB permet ensuite de requ\u00eater ces tables Iceberg sans infrastructure lourde, ce qui en fait un excellent outil de prototypage avant un d\u00e9ploiement sur Trino ou Spark.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p>Apache Iceberg repr\u00e9sente une brique technique cl\u00e9 pour faire \u00e9voluer les portails de donn\u00e9es ouvertes au-del\u00e0 du simple d\u00e9p\u00f4t de fichiers. En combinant versioning, performance analytique et interop\u00e9rabilit\u00e9, il offre un socle solide pour construire un v\u00e9ritable lakehouse de donn\u00e9es publiques. Pour les \u00e9quipes qui g\u00e8rent des portails CKAN avec des jeux de donn\u00e9es volumineux, c&rsquo;est une piste d&rsquo;architecture \u00e0 explorer s\u00e9rieusement.<\/p>","protected":false},"excerpt":{"rendered":"<p>Apache Iceberg&nbsp;: vers un lakehouse pour les donn\u00e9es ouvertes Les portails de donn\u00e9es ouvertes reposent encore largement sur des formats statiques \u2014 CSV, JSON, GeoJSON \u2014 distribu\u00e9s fichier par fichier. Cette approche, h\u00e9rit\u00e9e des d\u00e9buts de l&rsquo;open data, montre ses limites face \u00e0 l&rsquo;explosion des volumes, aux besoins de versioning et \u00e0 l&rsquo;exigence croissante de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2054,"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-2053","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 : vers un lakehouse pour les donnees ouvertes - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D&#039;\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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