{"id":459137,"date":"2025-05-10T21:00:41","date_gmt":"2025-05-10T21:00:41","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=459137"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=459137","title":{"rendered":"<span>Join \u0442\u0430\u0431\u043b\u0438\u0446 \u0432 \u0440\u0435\u0430\u043b\u044c\u043d\u043e\u043c \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u043d\u0430 Apache Flink ( \u0427\u0430\u0441\u0442\u044c 2 )<\/span>"},"content":{"rendered":"<div><!--[--><!--]--><\/div>\n<div id=\"post-content-body\">\n<div>\n<div class=\"article-formatted-body article-formatted-body article-formatted-body_version-2\">\n<div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\">\n<h2>\u0414\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0443\u0441\u043b\u043e\u0432\u0438\u044f Inner Join<\/h2>\n<p>\u0420\u0430\u043d\u0435\u0435 \u0432 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u0432 <code>InnerJoinFunction<\/code> \u043c\u044b \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0435 \u0434\u0430\u043b\u044c\u0448\u0435 \u043f\u043e \u043f\u043e\u0442\u043e\u043a\u0443 \u043d\u0435\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e \u043e\u0442 <code>CRUD<\/code> \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0431\u044b\u043b\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0430 \u043d\u0430 \u043d\u0430\u0448\u0443 \u0437\u0430\u043f\u0438\u0441\u044c &#8212; \u043c\u044b \u043f\u0440\u043e\u0441\u0442\u043e \u043f\u0440\u0438 \u043f\u0440\u0438\u0445\u043e\u0434\u0435 \u043d\u043e\u0432\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0438\u0437 \u043a\u0430\u043a\u043e\u0439 \u043b\u0438\u0431\u043e \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0432\u0441\u0435\u0433\u0434\u0430 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0438 \u043d\u043e\u0432\u0443\u044e \u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0421\u041f, \u043d\u043e \u0432\u0435\u0434\u044c \u0435\u0441\u043b\u0438 \u043f\u0440\u0438\u0434\u0435\u0442 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435, \u0443\u0432\u0435\u0434\u043e\u043c\u043b\u044f\u044e\u0449\u0435\u0435 \u043e\u0431 \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u0438 \u0437\u0430\u043f\u0438\u0441\u0438, \u0442\u043e \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0431\u0443\u0434\u0435\u0442 \u0437\u0430\u043f\u0438\u0441\u044c \u0443\u0434\u0430\u043b\u0438\u0442\u044c \u043d\u0430 \u0421\u041f \u0438 \u0435\u0441\u043b\u0438 \u0432\u0437\u0430\u0438\u043c\u043e\u0441\u0432\u044f\u0437\u044c \u0442\u0430\u0431\u043b\u0438\u0446 \u043e\u0434\u0438\u043d \u043a\u043e \u043c\u043d\u043e\u0433\u0438\u043c, \u0442\u043e \u043f\u0440\u0438\u0434\u0435\u0442\u0441\u044f \u0443\u0434\u0430\u043b\u0438\u0442\u044c \u043c\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0438\u0441\u0435\u0439.<\/p>\n<h2>\u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 Debezium \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f<\/h2>\n<p>\u041c\u044b \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u043c \u0441 \u043a\u0430\u0444\u043a\u043e\u0439 \u0438 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u043c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f, \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0435 Debezium \u0432 \u0434\u0430\u043d\u043d\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435. \u0415\u0433\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u043f\u0440\u0438\u0431\u043b\u0438\u0437\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0442\u0430\u043a\u0430\u044f \u043f\u0440\u0438 \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0435\u0439 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 ( \u0431\u041e\u043b\u044c\u0448\u0435\u0439 \u043d\u0430\u043c \u0438 \u043d\u0435 \u043d\u0430\u0434\u043e ).<\/p>\n<pre><code class=\"json\">{ \"op\": \"(c|r|u|d)\", \"source\": { ... }, \"ts_ms\" : \"...\", \"ts_us\" : \"...\", \"ts_ns\" : \"...\", \"before\" : [Data, null], \"after\" : [Data, null] }<\/code><\/pre>\n<p>\u0413\u0434\u0435 <code>Data<\/code> \u044d\u0442\u043e \u043c\u043e\u0434\u0435\u043b\u044c \u0434\u0430\u043d\u043d\u044b\u0445.<br \/>\u0412 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 <code>\"op\"<\/code> \u043f\u043e\u043b\u044f <code>before<\/code> \u0438 <code>after<\/code> \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u044e\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u043e\u0435 \u0432 \u043c\u043e\u0434\u0435\u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043b\u0438\u0431\u043e <code>null<\/code> . \u0415\u0441\u043b\u0438 \u0432\u043a\u0440\u0430\u0442\u0446\u0435, \u0442\u043e \u043f\u0440\u0438:<\/p>\n<pre><code>op = 'c' -&gt; before = null, after = Data -&gt; insert op = 'r' -&gt; before = null, after = Data -&gt; initial snapshot if set op = 'u' -&gt; before = Data, after = Data -&gt; update op = 'd' -&gt; before = Data, after = null -&gt; delete<\/code><\/pre>\n<h2>\u0414\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043c\u0430\u043f\u043f\u0435\u0440\u0430 \u043a\u043b\u0430\u0441\u0441\u0430 \u043c\u043e\u0434\u0435\u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0445<\/h2>\n<pre><code class=\"java\">public class Domain implements Serializable {   public Integer id;   public Integer user_id;   public String domain_name;   public boolean delete;    \/\/ getters and setters omitted    public static Domain fromRow(Row row) {         Character op = (Character) row.getField(1);          if (op == null) {             throw new IllegalStateException(\"Never should happen, if Debezium feels fine\");         }          Row domain = (Row) row.getField(op == 'd' ? 0 : 2);          Integer id = (Integer) domain.getField(0);         Integer user_id = (Integer) domain.getField(1);         Integer domain_name = (Integer) domain.getField(2);          return new Domain(id, user_id, domain_name);     } }<\/code><\/pre>\n<p>\u041f\u0440\u0438:<br \/>1. <code>op<\/code> = <code>c<\/code> \u0438\u043b\u0438 <code>r<\/code> \u0431\u0435\u0440\u0435\u043c \u0442\u043e, \u0447\u0442\u043e \u0432 after.<br \/>2. <code>op<\/code> = <code>d<\/code> \u0431\u0435\u0440\u0435\u043c \u0432\u0441\u0435\u0433\u0434\u0430 before.<br \/>3. <code>op<\/code> = <code>u<\/code> \u0431\u0435\u0440\u0435\u043c \u0432\u0441\u0435\u0433\u0434\u0430 \u0442\u043e\u0436\u0435 after, \u043e\u0434\u043d\u0430\u043a\u043e \u0435\u0441\u0442\u044c \u043d\u044e\u0430\u043d\u0441, \u043e \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435.<\/p>\n<p>\u0421 \u043c\u043e\u0434\u0435\u043b\u044c\u044e <code>User<\/code> \u043f\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0438 \u0441 <code>Domain<\/code>.<\/p>\n<h2>\u0414\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430 InnerJoinFunction<\/h2>\n<pre><code class=\"java\">import org.apache.flink.api.common.functions.OpenContext; import org.apache.flink.api.common.state.*; import org.apache.flink.streaming.api.functions.co.KeyedCoProcessFunction; import org.apache.flink.util.Collector;  import java.io.Serializable;  public class InnerJoinFunction extends KeyedCoProcessFunction&lt;Integer, User, Domain, InnerJoinFunction.Output&gt; {     private MapState&lt;Integer, Domain&gt; domainsState;     private ValueState&lt;User&gt; usersState;      @Override     public void processElement1(final User user, final Context ctx, final Collector&lt;InnerJoinFunction.Output&gt; out) throws Exception {         usersState.update(user);                for (final Domain domain : domainsState.values()) {             out.collect(new InnerJoinFunction.Output(                     user.id,                     user.firstname,                     user.lastname,                     domain.domain_name,                     user.delete || domain.delete             ));         }     }      @Override     public void processElement2(final Domain domain, final Context ctx, final Collector&lt;InnerJoinFunction.Output&gt; out) throws Exception {         domainsState.put(domain.id, domain);          final User user = usersState.value();          if (user != null) {             out.collect(new InnerJoinFunction.Output(                     user.id,                     user.firstname,                     user.lastname,                     domain.domain_name,                     user.delete || domain.delete             ));         }     }      @Override     public void open(OpenContext openContext) throws Exception {         var usersStateDescriptor = new ValueStateDescriptor&lt;&gt;(                 \"users\",                 User.class         );         var domainsStateDescriptor = new MapStateDescriptor&lt;&gt;(                 \"domains\",                 Integer.class,                 Domain.class         );         usersState = getRuntimeContext().getState(usersStateDescriptor);         domainsState = getRuntimeContext().getMapState(domainsStateDescriptor);          super.open(openContext);     }      public static class Output implements Serializable {         public Integer user_id;         public String firstname;         public String lastname;         public String domain_name;         public boolean delete;                  \/\/ getters and setters omitted     } }<\/code><\/pre>\n<p>\u0422\u0430\u043a\u043e\u0439 \u043f\u043e\u0434\u0445\u043e\u0434 \u0431\u0443\u0434\u0435\u0442 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441\u043e \u0432\u0441\u0435\u043c\u0438 <code>CRUD<\/code> \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f\u043c\u0438 \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c inner join \u0443\u0441\u043b\u043e\u0432\u0438\u0435.<\/p>\n<h2>\u041d\u044e\u0430\u043d\u0441 \u0441 update<\/h2>\n<p>\u0415\u0441\u043b\u0438 \u043a\u043b\u044e\u0447 join \u0438\u0437\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f ( \u043b\u044e\u0431\u0430\u044f \u0438\u0437 \u043a\u043e\u043b\u043e\u043d\u043e\u043a \u043e\u0434\u043d\u043e\u0439 \u0438\u0437 \u043b\u044e\u0431\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446 ), \u0442\u043e \u0434\u0430\u043d\u043d\u044b\u0439 \u043f\u043e\u0434\u0445\u043e\u0434 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u043d\u0435 \u0431\u0443\u0434\u0435\u0442 \u0438\u0437 \u0437\u0430 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f state \u0434\u0432\u0438\u0436\u043a\u043e\u043c Flink, \u0432 \u043d\u0430\u0448\u0435\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u043a\u043b\u044e\u0447\u043e\u043c join \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u043b\u0435 <code>user_id<\/code> \u0432 \u043e\u0431\u0435\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u0445 \u0438 \u0435\u0441\u043b\u0438 \u0432 \u043e\u0434\u043d\u043e\u0439 \u0438\u0437 \u043d\u0438\u0445 \u043e\u043d\u043e \u0438\u0437\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f, \u0442\u043e \u044d\u0442\u043e\u0442 \u043f\u043e\u0434\u0445\u043e\u0434 \u0432 \u043f\u0440\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f\u0445 <code>update<\/code> \u043d\u0430\u0434 <code>user_id<\/code> \u0431\u0443\u0434\u0435\u0442 \u043b\u043e\u043c\u0430\u0442\u044c \u043b\u043e\u0433\u0438\u043a\u0443.<\/p>\n<p>\u0412 3 \u0447\u0430\u0441\u0442\u0438 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u0439 \u0440\u0430\u0437\u0431\u043e\u0440 \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u044d\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b.<\/p>\n<p><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><!----><!----><\/div>\n<p><!----><!----><br \/> \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 <a href=\"https:\/\/habr.com\/ru\/articles\/908220\/\"> https:\/\/habr.com\/ru\/articles\/908220\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<div><!--[--><!--]--><\/div>\n<div id=\"post-content-body\">\n<div>\n<div class=\"article-formatted-body article-formatted-body article-formatted-body_version-2\">\n<div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\">\n<h2>\u0414\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0443\u0441\u043b\u043e\u0432\u0438\u044f Inner Join<\/h2>\n<p>\u0420\u0430\u043d\u0435\u0435 \u0432 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u0432 <code>InnerJoinFunction<\/code> \u043c\u044b \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0435 \u0434\u0430\u043b\u044c\u0448\u0435 \u043f\u043e \u043f\u043e\u0442\u043e\u043a\u0443 \u043d\u0435\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e \u043e\u0442 <code>CRUD<\/code> \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0431\u044b\u043b\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0430 \u043d\u0430 \u043d\u0430\u0448\u0443 \u0437\u0430\u043f\u0438\u0441\u044c &#8212; \u043c\u044b \u043f\u0440\u043e\u0441\u0442\u043e \u043f\u0440\u0438 \u043f\u0440\u0438\u0445\u043e\u0434\u0435 \u043d\u043e\u0432\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0438\u0437 \u043a\u0430\u043a\u043e\u0439 \u043b\u0438\u0431\u043e \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0432\u0441\u0435\u0433\u0434\u0430 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0438 \u043d\u043e\u0432\u0443\u044e \u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0421\u041f, \u043d\u043e \u0432\u0435\u0434\u044c \u0435\u0441\u043b\u0438 \u043f\u0440\u0438\u0434\u0435\u0442 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435, \u0443\u0432\u0435\u0434\u043e\u043c\u043b\u044f\u044e\u0449\u0435\u0435 \u043e\u0431 \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u0438 \u0437\u0430\u043f\u0438\u0441\u0438, \u0442\u043e \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0431\u0443\u0434\u0435\u0442 \u0437\u0430\u043f\u0438\u0441\u044c \u0443\u0434\u0430\u043b\u0438\u0442\u044c \u043d\u0430 \u0421\u041f \u0438 \u0435\u0441\u043b\u0438 \u0432\u0437\u0430\u0438\u043c\u043e\u0441\u0432\u044f\u0437\u044c \u0442\u0430\u0431\u043b\u0438\u0446 \u043e\u0434\u0438\u043d \u043a\u043e \u043c\u043d\u043e\u0433\u0438\u043c, \u0442\u043e \u043f\u0440\u0438\u0434\u0435\u0442\u0441\u044f \u0443\u0434\u0430\u043b\u0438\u0442\u044c \u043c\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0438\u0441\u0435\u0439.<\/p>\n<h2>\u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 Debezium \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f<\/h2>\n<p>\u041c\u044b \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u043c \u0441 \u043a\u0430\u0444\u043a\u043e\u0439 \u0438 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u043c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f, \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0435 Debezium \u0432 \u0434\u0430\u043d\u043d\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435. \u0415\u0433\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u043f\u0440\u0438\u0431\u043b\u0438\u0437\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0442\u0430\u043a\u0430\u044f \u043f\u0440\u0438 \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0435\u0439 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 ( \u0431\u041e\u043b\u044c\u0448\u0435\u0439 \u043d\u0430\u043c \u0438 \u043d\u0435 \u043d\u0430\u0434\u043e ).<\/p>\n<pre><code class=\"json\">{ \"op\": \"(c|r|u|d)\", \"source\": { ... }, \"ts_ms\" : \"...\", \"ts_us\" : \"...\", \"ts_ns\" : \"...\", \"before\" : [Data, null], \"after\" : [Data, null] }<\/code><\/pre>\n<p>\u0413\u0434\u0435 <code>Data<\/code> \u044d\u0442\u043e \u043c\u043e\u0434\u0435\u043b\u044c \u0434\u0430\u043d\u043d\u044b\u0445.<br \/>\u0412 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 <code>\"op\"<\/code> \u043f\u043e\u043b\u044f <code>before<\/code> \u0438 <code>after<\/code> \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u044e\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u043e\u0435 \u0432 \u043c\u043e\u0434\u0435\u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043b\u0438\u0431\u043e <code>null<\/code> . \u0415\u0441\u043b\u0438 \u0432\u043a\u0440\u0430\u0442\u0446\u0435, \u0442\u043e \u043f\u0440\u0438:<\/p>\n<pre><code>op = 'c' -&gt; before = null, after = Data -&gt; insert op = 'r' -&gt; before = null, after = Data -&gt; initial snapshot if set op = 'u' -&gt; before = Data, after = Data -&gt; update op = 'd' -&gt; before = Data, after = null -&gt; delete<\/code><\/pre>\n<h2>\u0414\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043c\u0430\u043f\u043f\u0435\u0440\u0430 \u043a\u043b\u0430\u0441\u0441\u0430 \u043c\u043e\u0434\u0435\u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0445<\/h2>\n<pre><code class=\"java\">public class Domain implements Serializable {   public Integer id;   public Integer user_id;   public String domain_name;   public boolean delete;    \/\/ getters and setters omitted    public static Domain fromRow(Row row) {         Character op = (Character) row.getField(1);          if (op == null) {             throw new IllegalStateException(\"Never should happen, if Debezium feels fine\");         }          Row domain = (Row) row.getField(op == 'd' ? 0 : 2);          Integer id = (Integer) domain.getField(0);         Integer user_id = (Integer) domain.getField(1);         Integer domain_name = (Integer) domain.getField(2);          return new Domain(id, user_id, domain_name);     } }<\/code><\/pre>\n<p>\u041f\u0440\u0438:<br \/>1. <code>op<\/code> = <code>c<\/code> \u0438\u043b\u0438 <code>r<\/code> \u0431\u0435\u0440\u0435\u043c \u0442\u043e, \u0447\u0442\u043e \u0432 after.<br \/>2. <code>op<\/code> = <code>d<\/code> \u0431\u0435\u0440\u0435\u043c \u0432\u0441\u0435\u0433\u0434\u0430 before.<br \/>3. <code>op<\/code> = <code>u<\/code> \u0431\u0435\u0440\u0435\u043c \u0432\u0441\u0435\u0433\u0434\u0430 \u0442\u043e\u0436\u0435 after, \u043e\u0434\u043d\u0430\u043a\u043e \u0435\u0441\u0442\u044c \u043d\u044e\u0430\u043d\u0441, \u043e \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435.<\/p>\n<p>\u0421 \u043c\u043e\u0434\u0435\u043b\u044c\u044e <code>User<\/code> \u043f\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0438 \u0441 <code>Domain<\/code>.<\/p>\n<h2>\u0414\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430 InnerJoinFunction<\/h2>\n<pre><code class=\"java\">import org.apache.flink.api.common.functions.OpenContext; import org.apache.flink.api.common.state.*; import org.apache.flink.streaming.api.functions.co.KeyedCoProcessFunction; import org.apache.flink.util.Collector;  import java.io.Serializable;  public class InnerJoinFunction extends KeyedCoProcessFunction&lt;Integer, User, Domain, InnerJoinFunction.Output&gt; {     private MapState&lt;Integer, Domain&gt; domainsState;     private ValueState&lt;User&gt; usersState;      @Override     public void processElement1(final User user, final Context ctx, final Collector&lt;InnerJoinFunction.Output&gt; out) throws Exception {         usersState.update(user);                for (final Domain domain : domainsState.values()) {             out.collect(new InnerJoinFunction.Output(                     user.id,                     user.firstname,                     user.lastname,                     domain.domain_name,                     user.delete || domain.delete             ));         }     }      @Override     public void processElement2(final Domain domain, final Context ctx, final Collector&lt;InnerJoinFunction.Output&gt; out) throws Exception {         domainsState.put(domain.id, domain);          final User user = usersState.value();          if (user != null) {             out.collect(new InnerJoinFunction.Output(                     user.id,                     user.firstname,                     user.lastname,                     domain.domain_name,                     user.delete || domain.delete             ));         }     }      @Override     public void open(OpenContext openContext) throws Exception {         var usersStateDescriptor = new ValueStateDescriptor&lt;&gt;(                 \"users\",                 User.class         );         var domainsStateDescriptor = new MapStateDescriptor&lt;&gt;(                 \"domains\",                 Integer.class,                 Domain.class         );         usersState = getRuntimeContext().getState(usersStateDescriptor);         domainsState = getRuntimeContext().getMapState(domainsStateDescriptor);          super.open(openContext);     }      public static class Output implements Serializable {         public Integer user_id;         public String firstname;         public String lastname;         public String domain_name;         public boolean delete;                  \/\/ getters and setters omitted     } }<\/code><\/pre>\n<p>\u0422\u0430\u043a\u043e\u0439 \u043f\u043e\u0434\u0445\u043e\u0434 \u0431\u0443\u0434\u0435\u0442 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441\u043e \u0432\u0441\u0435\u043c\u0438 <code>CRUD<\/code> \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f\u043c\u0438 \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c inner join \u0443\u0441\u043b\u043e\u0432\u0438\u0435.<\/p>\n<h2>\u041d\u044e\u0430\u043d\u0441 \u0441 update<\/h2>\n<p>\u0415\u0441\u043b\u0438 \u043a\u043b\u044e\u0447 join \u0438\u0437\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f ( \u043b\u044e\u0431\u0430\u044f \u0438\u0437 \u043a\u043e\u043b\u043e\u043d\u043e\u043a \u043e\u0434\u043d\u043e\u0439 \u0438\u0437 \u043b\u044e\u0431\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446 ), \u0442\u043e \u0434\u0430\u043d\u043d\u044b\u0439 \u043f\u043e\u0434\u0445\u043e\u0434 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u043d\u0435 \u0431\u0443\u0434\u0435\u0442 \u0438\u0437 \u0437\u0430 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f state \u0434\u0432\u0438\u0436\u043a\u043e\u043c Flink, \u0432 \u043d\u0430\u0448\u0435\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u043a\u043b\u044e\u0447\u043e\u043c join \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u043b\u0435 <code>user_id<\/code> \u0432 \u043e\u0431\u0435\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u0445 \u0438 \u0435\u0441\u043b\u0438 \u0432 \u043e\u0434\u043d\u043e\u0439 \u0438\u0437 \u043d\u0438\u0445 \u043e\u043d\u043e \u0438\u0437\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f, \u0442\u043e \u044d\u0442\u043e\u0442 \u043f\u043e\u0434\u0445\u043e\u0434 \u0432 \u043f\u0440\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f\u0445 <code>update<\/code> \u043d\u0430\u0434 <code>user_id<\/code> \u0431\u0443\u0434\u0435\u0442 \u043b\u043e\u043c\u0430\u0442\u044c \u043b\u043e\u0433\u0438\u043a\u0443.<\/p>\n<p>\u0412 3 \u0447\u0430\u0441\u0442\u0438 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u0439 \u0440\u0430\u0437\u0431\u043e\u0440 \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u044d\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b.<\/p>\n<p><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><!----><!----><\/div>\n<p><!----><!----><br \/> \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 <a href=\"https:\/\/habr.com\/ru\/articles\/908220\/\"> https:\/\/habr.com\/ru\/articles\/908220\/<\/a><br \/><\/br><\/br><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-459137","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/459137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=459137"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/459137\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=459137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=459137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=459137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}