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https://issues.apache.org/jira/browse/KAFKA-5062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15968265#comment-15968265
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Ismael Juma commented on KAFKA-5062:
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James, as stated previously, we check if the size is above the config value
(100 MB by default), and disconnect if it is.
> Kafka brokers can accept malformed requests which allocate gigabytes of memory
> ------------------------------------------------------------------------------
>
> Key: KAFKA-5062
> URL: https://issues.apache.org/jira/browse/KAFKA-5062
> Project: Kafka
> Issue Type: Bug
> Reporter: Apurva Mehta
>
> In some circumstances, it is possible to cause a Kafka broker to allocate
> massive amounts of memory by writing malformed bytes to the brokers port.
> In investigating an issue, we saw byte arrays on the kafka heap upto 1.8
> gigabytes, the first 360 bytes of which were non kafka requests -- an
> application was writing the wrong data to kafka, causing the broker to
> interpret the request size as 1.8GB and then allocate that amount. Apart from
> the first 360 bytes, the rest of the 1.8GB byte array was null.
> We have a socket.request.max.bytes set at 100MB to protect against this kind
> of thing, but somehow that limit is not always respected. We need to
> investigate why and fix it.
> cc [~rnpridgeon], [~ijuma], [~gwenshap], [~cmccabe]
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