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From "Lian, Li" <ll...@ebay.com>
Subject Re: What's the behavior when Kafka is deleting messages and consumers are still reading
Date Tue, 24 Jun 2014 22:54:41 GMT

Thanks for explaining. I thought there might be such kind of lock
mechanism but cannot confirm it in any documentation on Kafka website.

It will be better if this could be written down in some Wiki or FAQ.

Best regards,
Lex Lian

Email: llian@ebay.com

On 6/24/14, 11:17 PM, "Guozhang Wang" <wangguoz@gmail.com> wrote:

>Hi Li,
>The log operations are protected by a lock, so if there is a concurrent
>read on this partition it will not be deleted. But then when it is deleted
>the next fetch/read will result in a OffsetOutOfRange exception and the
>consumer needs to restart from a offset reset value.
>On Tue, Jun 24, 2014 at 5:20 AM, Lian, Li <llian@ebay.com> wrote:
>> When Kafka broker is trying to delete message according to the log
>> retention setting, either triggered by log age or topic partition size,
>> the same time there are still consumers reading the topic, what will
>> Best regards,
>> Lex Lian
>> Email: llian@ebay.com
>-- Guozhang

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