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{"id":137,"date":"2021-07-11T15:50:47","date_gmt":"2021-07-11T15:50:47","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=137"},"modified":"2021-09-15T05:37:02","modified_gmt":"2021-09-15T05:37:02","slug":"what-is-channel-selectors","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/apache-flume\/what-is-channel-selectors\/","title":{"rendered":"What is Channel Selectors ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"channel-selectors\" class=\"color-green\" style=\"text-align: justify;\">Channel Selectors<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Channel selectors control and dividing the events and allocating a specific channel. They are default or replicated channel selectors.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div class=\"ImageContent\">\n<div class=\"hddn\"><\/div>\n<div><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/apache-flume\/apache-flume-features.gif\" alt=\"Apache Flume Features\" width=\"686\" height=\"383\" \/><\/div>\n<\/div>\n<ul>\n<li>Replicated channel selectors can duplicate the information in multiple or all channels. Multiplexing channel selectors used to divide and aggregate the data based on the events header data.<\/li>\n<li>It means based on sinks destination, the event aggregate into the specific sink.<\/li>\n<li>Example: One sink associated with hadoop, another with S3 another with Hbase, at that time, Multiplexing channel selectors can divide the events and flow to the specific sink.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"text-center row\" style=\"text-align: justify;\">\n<div class=\"col-sm-12\">\n<div id=\"bsa-zone_1590522538159-8_123456\"><\/div>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/apache-flume\/what-are-channel-selectors.png\" alt=\"What are channel selectors\" width=\"616\" height=\"321\" \/><\/div>\n<\/div>\n<p style=\"text-align: justify;\" align=\"center\">Learn Flume &#8211; Flume tutorial &#8211;\u00a0what are channel selectors\u00a0&#8211; Flume examples &#8211; Flume programs<\/p>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li><b>Overview and Architecture<\/b>, a source can write at least with one or more channels.<\/li>\n<li>This is reason the property is plural channels instead of channel.<\/li>\n<li>There are two ways multiple channels can be handled. The event can be written to every channel or to only one channel, based on some Flume header value.<\/li>\n<li>The internal mechanism for this in Flume is known as\u00a0<b>channel selector.<\/b><\/li>\n<li>The selector for any channel can be determined using the\u00a0<code>selector.type<\/code>\u00a0property.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p style=\"text-align: justify;\">All selector-specific properties start with the typical Source prefix: the agent name, keyword sources, and source name:<\/p>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-markdown code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-markdown code-embed-code\">agent.sources.s1.selector.type=replicating<\/code><\/pre> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer-Channel selectors control and dividing the events and allocating a specific channel. They are default or replicated channel selectors.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"passster_activate_protection":false,"passster_protect_child_pages":"","passster_protection_type":"password","passster_password":"","passster_activate_overwrite_defaults":"","passster_headline":"","passster_instruction":"","passster_placeholder":"","passster_button":"","passster_id":"","passster_activate_misc_settings":"","passster_redirect_url":"","passster_hide":"no","passster_area_shortcode":"","gtb_hide_title":false,"gtb_wrap_title":false,"gtb_class_title":"","gtb_remove_headerfooter":false,"footnotes":""},"categories":[369],"tags":[430,371,426,425,402,429,428,424,427,401,431,423,364],"class_list":["post-137","post","type-post","status-publish","format-standard","hentry","category-apache-flume","tag-an-event-in-flume-is-a-unit-of-data-that-flows-through","tag-apache-flume-example","tag-flume-1-6-user-guide","tag-flume-file-channel","tag-flume-http-source","tag-flume-interview-questions","tag-flume-interview-questions-and-answers-for-experienced","tag-flume-kafka-channel","tag-flume-spooldir","tag-flume-user-guide","tag-interceptors-are-part-of-flumes-extensibility-model","tag-supplied-interceptor-in-flume","tag-wells-fargo-interview-questions-and-answers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Channel Selectors ? 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