{"id":382,"date":"2022-02-04T15:03:00","date_gmt":"2022-02-04T14:03:00","guid":{"rendered":"http:\/\/justmakeit.es\/?p=382"},"modified":"2022-02-03T15:09:42","modified_gmt":"2022-02-03T14:09:42","slug":"java-spark-broadcast","status":"publish","type":"post","link":"http:\/\/justmakeit.es\/?p=382","title":{"rendered":"Java + Spark + Broadcast"},"content":{"rendered":"\n<p>Para evitar tener que enviar por red informaci\u00f3n a las funciones de transformaci\u00f3n en repetidas ocasiones existe una manera meter esa informaci\u00f3n \u00aben sesi\u00f3n\u00bb para que sea accesible por todos los nodos\/executors sin la necesidad de que sea enviada repetidamente.<\/p>\n\n\n\n<p>Es necesario que esta informaci\u00f3n no var\u00ede, porque de variar, no tendr\u00edamos los cambios realizados tras la creaci\u00f3n del Broadcast.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>JavaSparkContext jsc = JavaSparkContext.fromSparkContext(sparkSession.sparkContext());\r\n\nBroadcast&lt;HashMap> negocio = jsc.broadcast(map2);\n\nJavaRDD&lt;Row> rdd = dsData.javaRDD().map(new MappingData(negocio));<\/code><\/pre>\n\n\n\n<p>El constructor de la clase MappingData tendr\u00e1 como atributo de la clase un objeto del tipo Broadcast<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public MappingData(Broadcast&lt;HashMap> negocio) {<\/code><\/pre>\n\n\n\n<p>Para acceder al contenido de dicho objeto se har\u00e1 as\u00ed<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Row> ls = (List&lt;Row>) negocio.getValue().get(id);<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Para evitar tener que enviar por red informaci\u00f3n a las funciones de transformaci\u00f3n en repetidas ocasiones existe una manera meter &hellip; <a href=\"http:\/\/justmakeit.es\/?p=382\" class=\"btn btn-readmore\">Read More <span class=\"screen-reader-text\"> \u00abJava + Spark + Broadcast\u00bb<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[51,36,34],"class_list":["post-382","post","type-post","status-publish","format-standard","hentry","category-cosos","tag-broadcast","tag-java","tag-spark"],"_links":{"self":[{"href":"http:\/\/justmakeit.es\/index.php?rest_route=\/wp\/v2\/posts\/382","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/justmakeit.es\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/justmakeit.es\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/justmakeit.es\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/justmakeit.es\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=382"}],"version-history":[{"count":1,"href":"http:\/\/justmakeit.es\/index.php?rest_route=\/wp\/v2\/posts\/382\/revisions"}],"predecessor-version":[{"id":383,"href":"http:\/\/justmakeit.es\/index.php?rest_route=\/wp\/v2\/posts\/382\/revisions\/383"}],"wp:attachment":[{"href":"http:\/\/justmakeit.es\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/justmakeit.es\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=382"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/justmakeit.es\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}