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From "David Parks" <davidpark...@yahoo.com>
Subject RE: Hadoop distcp from CDH4 to Amazon S3 - Improve Throughput
Date Fri, 29 Mar 2013 05:41:01 GMT
None of that complexity, they distribute the jar publicly (not the source,
but the jar). You can just add this to your libjars:


No VPN or anything, if you can access the internet you can get to S3. 


Follow their docs here:


Doesn't matter where you're Hadoop instance is running.


Here's an example of code/parameters I used to run it from within another
Tool, it's a Tool, so it's actually designed to run from the Hadoop command
line normally.


       ToolRunner.run(getConf(), new S3DistCp(), new String[] {

              "--src",             "/frugg/image-cache-stage2/",

              "--srcPattern",      ".*part.*",

              "--dest",            "s3n://fruggmapreduce/results-"+env+"/" +
JobUtils.isoDate + "/output/itemtable/", 

              "--s3Endpoint",      "s3.amazonaws.com"         });


Watch the "srcPattern", make sure you have that leading `.*`, that one threw
me for a loop once.





From: Himanish Kushary [mailto:himanish@gmail.com] 
Sent: Thursday, March 28, 2013 5:51 PM
To: user@hadoop.apache.org
Subject: Re: Hadoop distcp from CDH4 to Amazon S3 - Improve Throughput


Hi Dave,


Thanks for your reply. Our hadoop instance is inside our corporate LAN.Could
you please provide some details on how i could use the s3distcp from amazon
to transfer data from our on-premises hadoop to amazon s3. Wouldn't some
kind of VPN be needed between the Amazon EMR instance and our on-premises
hadoop instance ? Did you mean use the jar from amazon on our local server ?



On Thu, Mar 28, 2013 at 3:56 AM, David Parks <davidparks21@yahoo.com> wrote:

Have you tried using s3distcp from amazon? I used it many times to transfer
1.5TB between S3 and Hadoop instances. The process took 45 min, well over
the 10min timeout period you're running into a problem on.





From: Himanish Kushary [mailto:himanish@gmail.com] 
Sent: Thursday, March 28, 2013 10:54 AM
To: user@hadoop.apache.org
Subject: Hadoop distcp from CDH4 to Amazon S3 - Improve Throughput




I am trying to transfer around 70 GB of files from HDFS to Amazon S3 using
the distcp utility.There are aaround 2200 files distributed over 15
directories.The max individual file size is approx 50 MB.


The distcp mapreduce job keeps on failing with this error 


"Task attempt_201303211242_0260_m_000005_0 failed to report status for 600
seconds. Killing!"  


and in the task attempt logs I can see lot of INFO messages like 


"INFO org.apache.commons.httpclient.HttpMethodDirector: I/O exception
(java.io.IOException) caught when processing request: Resetting to invalid


I am thinking either transferring individual folders instead of the entire
70 GB folders as a workaround or as another option increasing the
"mapred.task.timeout" parameter to something like 6-7 hour ( as the avg rate
of transfer to S3 seems to be 5 MB/s).Is there any other better option to
increase the throughput for transferring bulk data from HDFS to S3 ?
Looking forward for suggestions.



Thanks & Regards


Thanks & Regards

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