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Re: HDFS 1.1.0 - File Append
Thomas,

Try using Flume to ingest the realtime message from RabbitMQ. Flume ingests
event data and has pluggable components: source -> channel -> sink.

http://flume.apache.org

There is an HDFS sink already that allows you to land and bunch data as you
like it. It will handle all of the landing logic to create temp and
permanent files as required in HDFS. The RabbitMQ source may require some
development but it's not hard. I'll see if one of my colleagues can publish
the source code of the one we wrote.

You might want to hit the flume user group for further support.

Cheers,
On Tue, Aug 6, 2013 at 9:18 AM, Thomas Stidsborg Sylvest <
[EMAIL PROTECTED]> wrote:

>  Hi,****
>
> ** **
>
> I am in the process of developing a framework around Hadoop that enables
> RabbitMQ messages to be persisted in HDFS. The messages will continuously
> stream into the system, as they are stock prices or weather data etc.
> Unfortunately it looks like I will not be able to append to a file in HDFS
> version 1.x.x. as per: ** **
>
> ** **
>
> *HADOOP-8230. Major improvement reported by eli2 and fixed by eli *
>
> *Enable sync by default and disable append*
>
> *Append is not supported in Hadoop 1.x. Please upgrade to 2.x if you need
> append. If you enabled dfs.support.append for HBase, you're OK, as durable
> sync (why HBase required dfs.support.append) is now enabled by default. If
> you really need the previous functionality, to turn on the append
> functionality set the flag "dfs.support.broken.append" to true.*
>
> ** **
>
> Link: http://hadoop.apache.org/docs/r1.1.1/releasenotes.html****
>
> ** **
>
> Could anyone please elaborate on this release note message? Why is it
> possible for HBase to append? Can I create a program somehow that is able
> to safely and robustly append to files?****
>
> ** **
>
> I am running HortonWorks Windows distribution (that is Hadoop version
> 1.1.0) on a cluster of 3 machines.****
>
> ** **
>
> Many thanks for your help in advance.****
>
> ** **
>
> Kind Regards,****
>
> ** **
>
> Thomas****
>
> ** **
>
> Best regards, ****
>
>  ****
>
>  ****
>
>  ****
>
>  ****
>
>  ****
>
> Thomas Stidsborg Sylvest
> Software Developer****
>
>  ****
>
> Mobile: ****
>
> +45 3141 4831 ****
>
>  ****
>
> [EMAIL PROTECTED] ****
>
>  ****
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--
*
*
*
*
*Adam Muise*
Solution Engineer
*Hortonworks*
[EMAIL PROTECTED]
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