Thanks for response , understood,
1.
Exception classes isn't available for any fetching related i believe in javadocs
TOPIC -> testing, partition count =1, offset count = 2
2.
Assuming the message 1st topics 1st message we are trying to read
"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
Under network latency of 1 kbps bandwidth, 1mb offset message with value of
fetch.min.bytes = 1 bytes along with fetch.max.wait.ms = 0.5 seconds , it will
fetch 1 kilobytes of data but that data if is in avro serialization it will be
in binary right, so the fetched data in binary message is upto "Lorem ipsum
dolor sit amet, consectetur adipiscing elit, sed do " for example
Then how data is assembled together for remaining potion ? how data is made as
whole ?
________________________________
From: Matthias J. Sax <mj...@apache.org>
Sent: Wednesday, October 16, 2024 06:23
To: users@kafka.apache.org <users@kafka.apache.org>
Subject: [EXT MSG] Re: KAFKA POLL
EXTERNAL source. Be CAREFUL with links / attachments
1. As pointed out in the JavaDocs
> @param timeoutMs The time, in milliseconds, spent waiting in poll if data is
> not available in the buffer.
2. If there is no data with the timeout, `poll()` return an "empty"
`ConsumerRecords` object.
For error/exception I cannot say, as it depends on the
error/exception... The exception which could be thrown are documented in
the JavaDocs, so maybe you can start there?
> consumerRecords<String, String> records = consumer.poll(10000L);
> * whether this records count will be 0 in this case ?
Yes, the `ConsumerRecords` object will be empty.
> if poll gets 500kb from topic in first poll within 10s after processing
> assuming no errors comes up and records count is 0 then in next poll whether
> next 500kb is fetched or it will attempt to again fetch full message ?
If the message is 1MB in size, it will either be fetched completely not
not at all. There will only be one fetch request and one fetch response.
If the first poll() send the fetch request, the second poll() would see
that a fetch request is already "in progress" and just wait for it to
complete (or again just let `poll()` return with empty result if the
timeout hits before the fetch request completes)
HTH.
-Matthias
On 10/10/24 5:27 AM, Sathishkumar Palanisamy wrote:
> Hi Team,
> Does anyone know in the experimental scenario,
> JAVA runtime 8 or 11
>
> 1. Kafka's topic -> Testing_topic
> 2. Kafka's topic partition count -> 1
> 3. Kafka's topic partition offset -> 2 [two messages are available, each
> weight about 1 mb ]
> 4. Bandwidth of 1 kb and Kafka's topic offset's message of 1 mb is
> available each
> 5. In consumer scenario
> * While polling the consumer using consumer.poll(10000L) deprecated
> method supporting the long argument
> * With properties (exactly used properties)
>
>
> i. props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
> bootstrap.server.config.url);
>
> ii.
> props.put(ConsumerConfig.GROUP_ID_CONFIG, group-1);
>
> iii.
> props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
> "org.apache.kafka.common.serialization.StringDeserializer");
>
> iv.
> props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
> "org.apache.kafka.common.serialization.StringDeserializer");
>
> v.
> props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, 1000);
>
> vi.
> props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
>
> vii.
> props.put("request.timeout.ms", "60000");
> Question
>
> 1. in poll(10000L ) given , whether this is in seconds or milliseconds or
> minutes (Deprecated method) ?
> 2. so in bandwidth of 1 kb for experimental purpose -> while polling
> assuming the 10000L is milliseconds so if I kafka consumer doesn't get the
> offset message which of 1 mb
> * what will happens in brief details ?
> * whether any errors/exceptions comes up ?
> * consumerRecords<String, String> records = consumer.poll(10000L);
> * whether this records count will be 0 in this case ?
> * if poll gets 500kb from topic in first poll within 10s after
> processing assuming no errors comes up and records count is 0 then in next
> poll whether next 500kb is fetched or it will attempt to again fetch full
> message ?
>
>
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