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From Neha Narkhede <neha.narkh...@gmail.com>
Subject Re: Shallow iteration and MirrorMaker
Date Wed, 23 Jan 2013 16:54:54 GMT
Hi Maxime,

Do you mean KafkaMigrationTool or MirrorMaker ? Are you trying to mirror
data between a Kafka 0.7 and Kafka 0.8 cluster ?
We have fixed the KafkaMigrationTool to always turn off shallow iteration
since we have to decompress data in 0.7 format before sending it to a 0.8


On Wed, Jan 23, 2013 at 6:39 AM, Maxime Brugidou

> Hi all,
> I am working with MirrorMaker on the 0.8 branch (so I haven't tested this
> on 0.7 but it looks similar).
> When I enable shallow.iterator.enable=true on the consumer config, (and
> disable compression on the producer config, as mentioned in the wiki) the
> throughput is really good but the data produced is unreadable since the
> messages are taken "as is" by the producer and i just get a bunch of bytes
> stored with the ByteBufferMessageSet header and all the info.
> I tested using the kafka-console-consumer to read my mirrored data and it's
> unreadable (unless I pipe the data to gunzip, which manages to read it).
> Did I miss something? Is there anything i can activate on the producer side
> of MirrorMaker to send the shallow message "as is"? Did anyone manage to
> make MirrorMaker work with shallow.iterator.enable=true?
> Thanks for your help,
> Maxime

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