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https://issues.apache.org/jira/browse/KAFKA-991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726958#comment-13726958
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Joel Koshy commented on KAFKA-991:
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+1
Committed to 0.8
Minor comment:
- queue size is unintuitive. sounds like number of messages, but it is bytes
- The totalSize > queueSize check should ideally be done before adding it to
msgList.
> Reduce the queue size in hadoop producer
> ----------------------------------------
>
> Key: KAFKA-991
> URL: https://issues.apache.org/jira/browse/KAFKA-991
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Swapnil Ghike
> Assignee: Swapnil Ghike
> Labels: bugs
> Fix For: 0.8
>
> Attachments: kafka-991-v1.patch
>
>
> Currently the queue.size in hadoop producer is 10MB. This means that the
> KafkaRecordWriter will hit the send button on kafka producer after the size
> of uncompressed queued messages becomes greater than 10MB. (The other
> condition on which the messages are sent is if their number exceeds
> SHORT.MAX_VALUE).
> Considering that the server accepts a (compressed) batch of messages of
> sizeupto 1 million bytes minus the log overhead, we should probably reduce
> the queue size in hadoop producer. We should do two things:
> 1. change max message size on the broker to 1 million + log overhead, because
> that will make the client message size easy to remember. Right now the
> maximum number of bytes that can be accepted from a client in a batch of
> messages is an awkward 999988. (I don't have a stronger reason). We have set
> fetch size on the consumer to 1MB, this gives us a lot of room even if the
> log overhead increased with further versions.
> 2. Set the default number of bytes on hadoop producer to 1 million bytes.
> Anyone who wants higher throughput can override this config using
> kafka.output.queue.size
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