Doubt on Kafka storage and Consuming messages

[Goutam Chowdhury <go...@gmail.com>]

Hi ,
I am new in Kafka . I went through some docments to understand Kafka. I
have some questions. Please help me to understand
1> Kafka storage:
What is the physical existing of segment file ?
What do you mean by "flushing segment file to disk"?
One of the document mentioned
-- "A message is only exposed to the consumers after it is flushed"
That means consumer has to wait ?

1> Consuming the message
>From where consumer read the messages? from segment file or from .log file
or from some cache?
2> If it is from cache then how and who is storing into such cache?



Thanks And Regards
Goutam Chowdhury