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demo_build-a-streaming-pipeline.html
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demo_build-a-streaming-pipeline.html
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<!DOCTYPE html>
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<title>Streaming ETL demo - Enriching event stream data with CDC data from MySQL, stream into Elasticsearch</title>
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<body class="article">
<div id="header">
<h1>Streaming ETL demo - Enriching event stream data with CDC data from MySQL, stream into Elasticsearch</h1>
<div class="details">
<span id="author" class="author">Robin Moffatt</span><br>
<span id="email" class="email"><a href="mailto:[email protected]">[email protected]</a></span><br>
<span id="revnumber">version 1.41,</span>
<span id="revdate">3 March 2020</span>
</div>
<div id="toc" class="toc">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_pre_reqs">Pre-reqs</a></li>
<li><a href="#_pre_flight_setup">Pre-Flight Setup</a>
<ul class="sectlevel2">
<li><a href="#_run_ksqldb_cli_and_mysql_cli">Run ksqlDB CLI and MySQL CLI</a></li>
</ul>
</li>
<li><a href="#_pre_flight_checklist">Pre-flight checklist</a></li>
<li><a href="#_demo">Demo</a></li>
<li><a href="#_part_01_ksqldb_for_filtering_streams">Part 01 - ksqlDB for filtering streams</a>
<ul class="sectlevel2">
<li><a href="#_inspect_topics">Inspect topics</a></li>
<li><a href="#_inspect_ratings_define_stream">Inspect ratings & define stream</a></li>
<li><a href="#_select_columns_from_live_stream_of_data">Select columns from live stream of data</a></li>
<li><a href="#_filter_live_stream_of_data">Filter live stream of data</a></li>
<li><a href="#_create_a_derived_stream">Create a derived stream</a></li>
</ul>
</li>
<li><a href="#_part_02_kafka_connect">Part 02 - Kafka Connect</a>
<ul class="sectlevel2">
<li><a href="#_kafka_to_elasticsearch">Kafka to Elasticsearch</a></li>
<li><a href="#_show_mysql_table_contents">Show MySQL table + contents</a></li>
<li><a href="#_ingest_the_data_plus_any_new_changes_into_kafka">Ingest the data (plus any new changes) into Kafka</a></li>
<li><a href="#_show_kafka_topic_has_been_created_populated">Show Kafka topic has been created & populated</a></li>
</ul>
</li>
<li><a href="#_part_03_ksqldb_for_joining_streams">Part 03 - ksqlDB for joining streams</a>
<ul class="sectlevel2">
<li><a href="#_join_live_stream_of_ratings_to_customer_data">Join live stream of ratings to customer data</a></li>
<li><a href="#_optional_examine_changing_reference_data">[Optional] Examine changing reference data</a></li>
<li><a href="#_create_stream_of_unhappy_vips">Create stream of unhappy VIPs</a></li>
</ul>
</li>
<li><a href="#_stream_to_elasticsearch">Stream to Elasticsearch</a>
<ul class="sectlevel2">
<li><a href="#_view_in_kibana">View in Kibana</a></li>
<li><a href="#_aggregations">Aggregations</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p><span class="image"><img src="images/ksql-debezium-es.png" alt="Kafka Connect / ksqlDB / Elasticsearch"></span></p>
</div>
<div class="paragraph">
<p>This is designed to be run as a step-by-step demo. The <code>ksqldb-statements.sql</code> should match those run in this doc end-to-end and in theory you can just run the file, but I have not tested it. PRs welcome for a one-click script that just demonstrates the end-to-end running demo :)</p>
</div>
<div class="paragraph">
<p>The slides that accompany this demo can be found here: <a href="https://go.rmoff.net/devoxxuk19" class="bare">https://go.rmoff.net/devoxxuk19</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_pre_reqs">Pre-reqs</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Local:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>curl</code></p>
</li>
<li>
<p><code>jq</code></p>
</li>
<li>
<p>Docker</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_pre_flight_setup">Pre-Flight Setup</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Start the environment</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">docker-compose up -d</code></pre>
</div>
</div>
<div class="sect2">
<h3 id="_run_ksqldb_cli_and_mysql_cli">Run ksqlDB CLI and MySQL CLI</h3>
<div class="paragraph">
<p>Optionally, use something like <code>screen</code> or <code>tmux</code> to have these both easily to hand. Or multiple Terminal tabs. Whatever works for you :)</p>
</div>
<div class="ulist">
<ul>
<li>
<p>ksqlDB CLI:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">docker exec -it ksqldb bash -c 'echo -e "\n\n⏳ Waiting for ksqlDB to be available before launching CLI\n"; while : ; do curl_status=$(curl -s -o /dev/null -w %{http_code} http://ksqldb:8088/info) ; echo -e $(date) " ksqlDB server listener HTTP state: " $curl_status " (waiting for 200)" ; if [ $curl_status -eq 200 ] ; then break ; fi ; sleep 5 ; done ; ksql http://ksqldb:8088'</code></pre>
</div>
</div>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_pre_flight_checklist">Pre-flight checklist</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Load <a href="http://localhost:5601/app/kibana#/dashboard/mysql-ksql-kafka-es">Kibana ratings dashboard</a></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_demo">Demo</h2>
<div class="sectionbody">
<div class="paragraph">
<p><span class="image"><img src="images/ksql-debezium-es.png" alt="Kafka Connect / ksqlDB / Elasticsearch"></span></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_part_01_ksqldb_for_filtering_streams">Part 01 - ksqlDB for filtering streams</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_inspect_topics">Inspect topics</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SHOW TOPICS;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">ksql> SHOW TOPICS;
Kafka Topic | Partitions | Partition Replicas
-------------------------------------------------------------------------
confluent_rmoff_02ksql_processing_log | 1 | 1
ratings | 1 | 1
-------------------------------------------------------------------------</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_inspect_ratings_define_stream">Inspect ratings & define stream</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">CREATE STREAM RATINGS WITH (KAFKA_TOPIC='ratings',VALUE_FORMAT='AVRO');</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_select_columns_from_live_stream_of_data">Select columns from live stream of data</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SELECT STARS, CHANNEL, MESSAGE FROM RATINGS EMIT CHANGES;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_filter_live_stream_of_data">Filter live stream of data</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SELECT STARS, CHANNEL, MESSAGE FROM RATINGS WHERE STARS<3 EMIT CHANGES;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_create_a_derived_stream">Create a derived stream</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">CREATE STREAM POOR_RATINGS AS
SELECT STARS, CHANNEL, MESSAGE FROM RATINGS WHERE STARS<3;
SELECT * FROM POOR_RATINGS EMIT CHANGES LIMIT 5;
DESCRIBE EXTENDED POOR_RATINGS;</code></pre>
</div>
</div>
<div class="paragraph">
<p>Optionally, bring up a second ksqlDB prompt and show live ratings / live filtered ratings:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">-- Live stream of ratings data
SET 'auto.offset.reset' = 'latest';
PRINT 'ratings';
-- You can use SELECT too, but PRINT makes it clearer that it's coming from a topic
SELECT TIMESTAMPTOSTRING(ROWTIME, 'yyyy-MM-dd HH:mm:ss') AS RATING_TIMESTAMP, STARS, CHANNEL FROM RATINGS EMIT CHANGES;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">-- Just the ratings with star rating less than 3:
SET 'auto.offset.reset' = 'latest';
PRINT 'POOR_RATINGS';
-- You can use SELECT too, but PRINT makes it clearer that it's coming from a topic
SELECT TIMESTAMPTOSTRING(ROWTIME, 'yyyy-MM-dd HH:mm:ss') AS RATING_TIMESTAMP, STARS, CHANNEL FROM POOR_RATINGS EMIT CHANGES;</code></pre>
</div>
</div>
<hr>
<div class="paragraph">
<p>Return to slides</p>
</div>
<hr>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_part_02_kafka_connect">Part 02 - Kafka Connect</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_kafka_to_elasticsearch">Kafka to Elasticsearch</h3>
<div class="paragraph">
<p>See also kafka-to-es-demo.adoc</p>
</div>
</div>
<div class="sect2">
<h3 id="_show_mysql_table_contents">Show MySQL table + contents</h3>
<div class="paragraph">
<p>Launch the MySQL CLI:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">docker exec -it mysql bash -c 'mysql -u $MYSQL_USER -p$MYSQL_PASSWORD demo'</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SHOW TABLES;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">+----------------+
| Tables_in_demo |
+----------------+
| CUSTOMERS |
+----------------+
1 row in set (0.00 sec)</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SELECT ID, FIRST_NAME, LAST_NAME, EMAIL, CLUB_STATUS FROM CUSTOMERS LIMIT 5;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">+----+-------------+------------+------------------------+-------------+
| ID | FIRST_NAME | LAST_NAME | EMAIL | CLUB_STATUS |
+----+-------------+------------+------------------------+-------------+
| 1 | Rica | Blaisdell | [email protected] | bronze |
| 2 | Ruthie | Brockherst | [email protected] | platinum |
| 3 | Mariejeanne | Cocci | [email protected] | bronze |
| 4 | Hashim | Rumke | [email protected] | platinum |
| 5 | Hansiain | Coda | [email protected] | platinum |
+----+-------------+------------+------------------------+-------------+
5 rows in set (0.00 sec)</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_ingest_the_data_plus_any_new_changes_into_kafka">Ingest the data (plus any new changes) into Kafka</h3>
<div class="paragraph">
<p>In ksqlDB:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">CREATE SOURCE CONNECTOR SOURCE_MYSQL_01 WITH (
'connector.class' = 'io.debezium.connector.mysql.MySqlConnector',
'database.hostname' = 'mysql',
'database.port' = '3306',
'database.user' = 'debezium',
'database.password' = 'dbz',
'database.server.id' = '42',
'database.server.name' = 'asgard',
'table.whitelist' = 'demo.customers',
'database.history.kafka.bootstrap.servers' = 'kafka:29092',
'database.history.kafka.topic' = 'dbhistory.demo' ,
'include.schema.changes' = 'false',
'transforms'= 'unwrap,extractkey',
'transforms.unwrap.type'= 'io.debezium.transforms.ExtractNewRecordState',
'transforms.extractkey.type'= 'org.apache.kafka.connect.transforms.ExtractField$Key',
'transforms.extractkey.field'= 'id',
'key.converter'= 'org.apache.kafka.connect.storage.StringConverter',
'value.converter'= 'io.confluent.connect.avro.AvroConverter',
'value.converter.schema.registry.url'= 'http://schema-registry:8081'
);</code></pre>
</div>
</div>
<div class="paragraph">
<p>Check that it’s running:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">ksql> SHOW CONNECTORS;
Connector Name | Type | Class | Status
----------------------------------------------------------------------------------------------------------------
source-datagen-01 | SOURCE | io.confluent.kafka.connect.datagen.DatagenConnector | RUNNING (1/1 tasks RUNNING)
SOURCE_MYSQL_01 | SOURCE | io.debezium.connector.mysql.MySqlConnector | RUNNING (1/1 tasks RUNNING)
----------------------------------------------------------------------------------------------------------------</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_show_kafka_topic_has_been_created_populated">Show Kafka topic has been created & populated</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SHOW TOPICS;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">ksql> SHOW TOPICS;
Kafka Topic | Partitions | Partition Replicas
-------------------------------------------------------------------------
POOR_RATINGS | 1 | 1
asgard.demo.CUSTOMERS | 1 | 1
confluent_rmoff_02ksql_processing_log | 1 | 1
dbhistory.demo | 1 | 1
ratings | 1 | 1
-------------------------------------------------------------------------</code></pre>
</div>
</div>
<div class="paragraph">
<p>Show topic contents</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">PRINT 'asgard.demo.CUSTOMERS' FROM BEGINNING;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">Key format: KAFKA (STRING)
Value format: AVRO rowtime: 3/3/20 1:35:52 PM UTC, key: 1, value: {"id": 1, "first_name": "Rica", "last_name": "Blaisdell", "email": "[email protected]", "gender": "Female", "club_status": "bronze", "comments": "Universal optimal hierarchy", "create_ts": "2020-03-03T13:32:03Z", "update_ts": "202
0-03-03T13:32:03Z"} rowtime: 3/3/20 1:35:52 PM UTC, key: 2, value: {"id": 2, "first_name": "Ruthie", "last_name": "Brockherst", "email": "[email protected]", "gender": "Female", "club_status": "platinum", "comments": "Reverse-engineered tangible interface", "create_ts": "2020-03-03T13:32:03Z", "updat
e_ts": "2020-03-03T13:32:03Z"}
…</code></pre>
</div>
</div>
<div class="paragraph">
<p>Create ksqlDB stream and table</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">CREATE TABLE CUSTOMERS WITH (KAFKA_TOPIC='asgard.demo.CUSTOMERS', VALUE_FORMAT='AVRO');</code></pre>
</div>
</div>
<div class="paragraph">
<p>Query the ksqlDB table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SET 'auto.offset.reset' = 'earliest';
SELECT ID, FIRST_NAME, LAST_NAME, EMAIL, CLUB_STATUS FROM CUSTOMERS EMIT CHANGES;</code></pre>
</div>
</div>
<div class="sect3">
<h4 id="_make_changes_in_mysql_observe_it_in_kafka">Make changes in MySQL, observe it in Kafka</h4>
<div class="paragraph">
<p>MySQL terminal:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">INSERT INTO CUSTOMERS (ID,FIRST_NAME,LAST_NAME) VALUES (42,'Rick','Astley');</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">UPDATE CUSTOMERS SET EMAIL = '[email protected]' where ID=42;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">UPDATE CUSTOMERS SET CLUB_STATUS = 'bronze' where ID=42;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">UPDATE CUSTOMERS SET CLUB_STATUS = 'platinum' where ID=42;</code></pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="_optional_demonstrate_stream_table_difference">[Optional] Demonstrate Stream / Table difference</h4>
<div class="paragraph">
<p>Check the data in ksqlDB:</p>
</div>
<div class="paragraph">
<p>Here’s the table - the latest value for a given key</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SELECT TIMESTAMPTOSTRING(ROWTIME, 'HH:mm:ss') AS EVENT_TS,
ID,
FIRST_NAME,
LAST_NAME,
EMAIL,
CLUB_STATUS
FROM CUSTOMERS WHERE ID=42
EMIT CHANGES;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">+----------+----+-----------+----------+-----------------+------------+
|EVENT_TS |ID |FIRST_NAME |LAST_NAME |EMAIL |CLUB_STATUS |
+----------+----+-----------+----------+-----------------+------------+
|15:43:58 |42 |Rick |Astley |[email protected] |platinum |
^CQuery terminated</code></pre>
</div>
</div>
<div class="paragraph">
<p>Here’s the stream - every event, which in this context is every change event on the source database:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">CREATE STREAM CUSTOMERS_STREAM WITH (KAFKA_TOPIC='asgard.demo.CUSTOMERS', VALUE_FORMAT='AVRO');
SET 'auto.offset.reset' = 'earliest';
SELECT TIMESTAMPTOSTRING(ROWTIME, 'HH:mm:ss') AS EVENT_TS,
ID,
FIRST_NAME,
LAST_NAME,
EMAIL,
CLUB_STATUS
FROM CUSTOMERS_STREAM WHERE ID=42
EMIT CHANGES;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">+---------+----+-----------+----------+------------------+------------+
|TS |ID |FIRST_NAME |LAST_NAME |EMAIL |CLUB_STATUS |
+---------+----+-----------+----------+------------------+------------+
|16:08:49 |42 |Rick |Astley |null |null |
|16:09:30 |42 |Rick |Astley |[email protected] |null |
|16:09:32 |42 |Rick |Astley |[email protected] |bronze |
|16:09:35 |42 |Rick |Astley |[email protected] |platinum |
^CQuery terminated
ksql></code></pre>
</div>
</div>
<hr>
<div class="paragraph">
<p>Return to slides</p>
</div>
<hr>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_part_03_ksqldb_for_joining_streams">Part 03 - ksqlDB for joining streams</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_join_live_stream_of_ratings_to_customer_data">Join live stream of ratings to customer data</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SELECT R.RATING_ID, R.MESSAGE, R.CHANNEL,
C.ID, C.FIRST_NAME + ' ' + C.LAST_NAME AS FULL_NAME,
C.CLUB_STATUS
FROM RATINGS R
LEFT JOIN CUSTOMERS C
ON CAST(R.USER_ID AS STRING) = C.ROWKEY
WHERE C.FIRST_NAME IS NOT NULL
EMIT CHANGES;</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">+------------+-----------------------------------+-------+--------------------+-------------+
|RATING_ID |MESSAGE |ID |FULL_NAME |CLUB_STATUS |
+------------+-----------------------------------+-------+--------------------+-------------+
|1 |more peanuts please |9 |Even Tinham |silver |
|2 |Exceeded all my expectations. Thank|8 |Patti Rosten |silver |
| | you ! | | | |
|3 |meh |17 |Brianna Paradise |bronze |
|4 |is this as good as it gets? really |14 |Isabelita Talboy |gold |
| |? | | | |
|5 |why is it so difficult to keep the |19 |Josiah Brockett |gold |
| |bathrooms clean ? | | | |
…</code></pre>
</div>
</div>
<div class="paragraph">
<p>Persist this stream of data</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SET 'auto.offset.reset' = 'earliest';
CREATE STREAM RATINGS_WITH_CUSTOMER_DATA
WITH (KAFKA_TOPIC='ratings-enriched')
AS
SELECT R.RATING_ID, R.MESSAGE, R.STARS, R.CHANNEL,
C.ID, C.FIRST_NAME + ' ' + C.LAST_NAME AS FULL_NAME,
C.CLUB_STATUS, C.EMAIL
FROM RATINGS R
LEFT JOIN CUSTOMERS C
ON CAST(R.USER_ID AS STRING) = C.ROWKEY
WHERE C.FIRST_NAME IS NOT NULL
EMIT CHANGES;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_optional_examine_changing_reference_data">[Optional] Examine changing reference data</h3>
<div class="paragraph">
<p>CUSTOMERS is a ksqlDB <em>table</em>, which means that we have the latest value for a given key.</p>
</div>
<div class="paragraph">
<p>Check out the ratings for customer id 2 only:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">SELECT TIMESTAMPTOSTRING(ROWTIME, 'HH:mm:ss') AS EVENT_TS,
FULL_NAME, CLUB_STATUS, STARS, MESSAGE, CHANNEL
FROM RATINGS_WITH_CUSTOMER_DATA
WHERE ID=2
EMIT CHANGES;</code></pre>
</div>
</div>
<div class="paragraph">
<p>In mysql, make a change to ID 2</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-sql" data-lang="sql">UPDATE CUSTOMERS SET CLUB_STATUS = 'bronze' WHERE ID=2;</code></pre>
</div>
</div>
<div class="paragraph">
<p>Observe in the continuous ksqlDB query that the customer name has now changed.</p>
</div>
</div>
<div class="sect2">
<h3 id="_create_stream_of_unhappy_vips">Create stream of unhappy VIPs</h3>