In this post , we will see How to Get Count of Messages in a Kafka Topic. There are different ways and workarounds to get this done. However do note that these options might not be an Exact count of messages and could turn out to be a ballpark estimate.
kafka-run-class.sh kafka.tools.ConsumerOffsetChecker \\
--topic <TOPIC\_NAME> \\
--zookeeper localhost:2181 \\
--group <GROUP\_NAME>
kafka-run-class.sh kafka.admin.ConsumerGroupCommand \\
--group <GROUP\_NAME> \\
--bootstrap-server localhost:9092 \\
--describe
The output will look somewhat like below . The "LAG" will indicate the COUNT of messages in the specific partition within a Topic.
TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG
TEST 0 XXxxx YYyyyy ZZ1
TEST 1 XXxxx YYyyyy ZZ2
TEST 2 XXxxxx YYyyyy ZZ3
$ kafka-run-class kafka.tools.GetOffsetShell \\
--broker-list <HOST1:PORT,HOST2:PORT> \\
--topic <TOPIC\_NAME>
This command will display the number of messages in each Topic Partitions.
$ kafkacat -b broker:<PORT> -t <TOPIC\_NAME> -C -e -q| wc -l
CREATE STREAM ST1 (Date VARCHAR ,
Time VARCHAR ,
Field1 VARCHAR )
WITH (KAFKA\_TOPIC='TEST1',
VALUE\_FORMAT='DELIMITED');
SELECT NAME, COUNT(\*) AS Count\_Of\_Msg
FROM ST1
GROUP BY 1
EMIT CHANGES;
kafka-console-consumer.sh \\
--from-beginning \\
--bootstrap-server <BROKER:PORT> \\
--property print.key=true \\
--property print.value=false \\
--property print.partition \\
--topic <TOPIC\_NAME> | tail -n 10|grep "Msg Count="
Hope this helps.
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