No CDC data in Cassandra binary logs (cdc_raw)

I encountered an issue while using CDC in Cassandra and need your help to resolve it.

I have set up a Change Data Capture (CDC) system to track changes in a specific table. CDC is enabled, and I can see that binary logs are being created in the cdc_raw directory. However, I noticed that the data modify (insert new records, update existing ones, or delete records) in this table does not appear in the cdc_raw logs. That is, the logs remain empty.

For reading CDC binary logs (cdc_raw), I rely on a pre-built .jar file that implements the Java class CommitLogReader.java

Below is my sequence of steps:

1 Installed Cassandra 4.1.8 in Docker

2 Set the variables in the file /etc/cassandra/cassandra.yaml

cdc_enabled: true

cdc_raw_directory: /var/lib/cassandra/cdc_raw

commitlog_directory: /var/lib/cassandra/commitlog

cdc_total_space: 4096MiB

cdc_free_space_check_interval: 250ms

3 Created a keyspace demo

CREATE KEYSPACE demo WITH REPLICATION = { 'class' : 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '3' };

4 Created a table demo.my_table_cdc_text

CREATE TABLE demo.my_table_cdc_text(
    id int,
    code text,
    first_name text,
    last_name text,
    email text,
    PRIMARY KEY(id, code)
)
WITH cdc=true;

5 Added data to the table demo.my_table_cdc_text (350 rows)

BEGIN batch
    INSERT INTO demo.my_table_cdc_text (id, code, email, first_name, last_name) VALUES(769, 'brown fox jumps over t', 'Joelle.Stuart.11@yahoo.in', 'Abraham', 'Douglas');
    INSERT INTO demo.my_table_cdc_text (id, code, email, first_name, last_name) VALUES(769, 'dogThe quick brown fox jumps ove', 'Calvin.Haines.02@hetnet.nl', 'Oscar', 'Jeremy');
    INSERT INTO demo.my_table_cdc_text (id, code, email, first_name, last_name) VALUES(769, 'dogThe quick brown fox jumps over t', 'Mercedes.Pippen.46@yahoo.es', 'Maggie', 'Roberta');
    .........
    INSERT INTO demo.my_table_cdc_text (id, code, email, first_name, last_name) VALUES(769, 'fox jumps over', 'Teresa.Plumb.84@laposte.net', 'Ida', 'Tamara');
    INSERT INTO demo.my_table_cdc_text (id, code, email, first_name, last_name) VALUES(769, 'fox jumps over the lazy dogThe quick bro', 'Hodierna.Nicol.73@terra.com.br', 'Rich', 'Beatrice');
apply batch;

P.S: I also tried these parameters and commands:

• changed the log_segment_size parameter from 32MiB to 1Mib;
• run command: nodetool flush demo my_table_cdc_text