ksqldb

问题 Suppose I have different values for a same message key. For example: { userid: 1, email: user123@xyz.com } { userid: 1, email: user456@xyz.com } { userid: 1, email: user789@xyz.com } In this above case I want only the latest value updated by the user, that is, 'user789@xyz.com'. My kafka stream should give me only the third value and not the previous 2 values. 回答1: Since you've not specified a particular client, I'll show you how this can be done with ksqlDB and the newly-added function,

问题 Suppose I have different values for a same message key. For example: { userid: 1, email: user123@xyz.com } { userid: 1, email: user456@xyz.com } { userid: 1, email: user789@xyz.com } In this above case I want only the latest value updated by the user, that is, 'user789@xyz.com'. My kafka stream should give me only the third value and not the previous 2 values. 回答1: Since you've not specified a particular client, I'll show you how this can be done with ksqlDB and the newly-added function,

问题 Suppose I have different values for a same message key. For example: { userid: 1, email: user123@xyz.com } { userid: 1, email: user456@xyz.com } { userid: 1, email: user789@xyz.com } In this above case I want only the latest value updated by the user, that is, 'user789@xyz.com'. My kafka stream should give me only the third value and not the previous 2 values. 回答1: Since you've not specified a particular client, I'll show you how this can be done with ksqlDB and the newly-added function,

问题 Suppose I have different values for a same message key. For example: { userid: 1, email: user123@xyz.com } { userid: 1, email: user456@xyz.com } { userid: 1, email: user789@xyz.com } In this above case I want only the latest value updated by the user, that is, 'user789@xyz.com'. My kafka stream should give me only the third value and not the previous 2 values. 回答1: Since you've not specified a particular client, I'll show you how this can be done with ksqlDB and the newly-added function,

问题 I have a spring boot application that is connected to a kafka cluster. How can I run KSQL from java code? 回答1: At the moment, there is no direct way to use KSQL as a library in java. There is an open issue#734 for the same. But you can run the KSQL statement using REST API and that implementation can be done in Spring Boot Application. A Rest call would look something like this: POST /query HTTP/1.1 Accept: application/vnd.ksql.v1+json Content-Type: application/vnd.ksql.v1+json { "ksql":

问题 I have a spring boot application that is connected to a kafka cluster. How can I run KSQL from java code? 回答1: At the moment, there is no direct way to use KSQL as a library in java. There is an open issue#734 for the same. But you can run the KSQL statement using REST API and that implementation can be done in Spring Boot Application. A Rest call would look something like this: POST /query HTTP/1.1 Accept: application/vnd.ksql.v1+json Content-Type: application/vnd.ksql.v1+json { "ksql":

问题 I was looking for an example using Kafka Streams on how to do this sort of thing, i.e. join a customers table with a addresses table and sink the data to ES:- Customers +------+------------+----------------+-----------------------+ | id | first_name | last_name | email | +------+------------+----------------+-----------------------+ | 1001 | Sally | Thomas | sally.thomas@acme.com | | 1002 | George | Bailey | gbailey@foobar.com | | 1003 | Edward | Davidson | ed@walker.com | | 1004 | Anne | Kim

问题 I was looking for an example using Kafka Streams on how to do this sort of thing, i.e. join a customers table with a addresses table and sink the data to ES:- Customers +------+------------+----------------+-----------------------+ | id | first_name | last_name | email | +------+------------+----------------+-----------------------+ | 1001 | Sally | Thomas | sally.thomas@acme.com | | 1002 | George | Bailey | gbailey@foobar.com | | 1003 | Edward | Davidson | ed@walker.com | | 1004 | Anne | Kim

来源： https://stackoverflow.com/questions/63194629/ksql-is-not-getting-started-ksql-server-start-32-exec-bin-ksql-run-class

来源： https://stackoverflow.com/questions/63194629/ksql-is-not-getting-started-ksql-server-start-32-exec-bin-ksql-run-class