[jira] [Created] (FLINK-9308) The method enableCheckpointing with low values like 10 are forming DoS on Kafka Clusters

["Seweryn Habdank-Wojewodzki (JIRA)" <ji...@apache.org>]

Seweryn Habdank-Wojewodzki created FLINK-9308:
-------------------------------------------------

             Summary: The method enableCheckpointing with low values like 10 are forming DoS on Kafka Clusters
                 Key: FLINK-9308
                 URL: https://issues.apache.org/jira/browse/FLINK-9308
             Project: Flink
          Issue Type: Bug
            Reporter: Seweryn Habdank-Wojewodzki


Hi,

Docus about Checkpoints in Flink contains such an example:

{code}
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

// start a checkpoint every 1000 ms
env.enableCheckpointing(1000);
{code}

Nice. There is one hack. The enableCheckpointing( parametr /* in [ms]*/); when used with eg. 1 or 10 will kill Kafka Server by continuous commits of offsets.

Every creatiive developer, who would like to defend the SW from duplication of messages in case of crash, will decrease this parameter to minimum. He will protect his app, but on the Kafka Broker/Server side he will cause DoS.

Can you have a look, to limit minimum value in case of Kafka Stream Environment?
I am not sure if 100ms as minimum is enough, but 1000 ms as minimum would be nice.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)