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From Pankaj Misra <pankaj.mi...@impetus.co.in>
Subject RE: Erasure Coding in HDFS
Date Mon, 17 Dec 2012 09:44:34 GMT
Dear All,

Any ideas on the questions below would be extremely helpful, requesting for your help and
support, appreciate it. Thanks.

Regards
Pankaj Misra

From: Pankaj Misra
Sent: Friday, December 14, 2012 5:42 PM
To: user@hadoop.apache.org
Subject: RE: Erasure Coding in HDFS

Requesting for community's help for the questions below, as it will help us better understand
erasure coding at HDFS level in context of replication. Thanks.

Thanks and Regards
Pankaj Misra
________________________________
From: Pankaj Misra
Sent: Thursday, December 13, 2012 3:20 PM
To: user@hadoop.apache.org<mailto:user@hadoop.apache.org>
Subject: Erasure Coding in HDFS
Dear All,

I was looking at options for reducing the overall cost of storage that is incurred due to
replication of data across the datanodes for higher availability and data localization for
processing.

I stumbled on a few articles suggesting erasure coding (software-raid) as one such mechanism
which can provide upt 5 to 8 9s of availability while keeping the replication factor low.

I also came across a JIRA for erasure coding in HDFS
https://issues.apache.org/jira/browse/HDFS-503

I will need some help to understand the following
1. How can I use erasure coding with Hadoop 1.1.1 release?
2. How will erasure coding work with replication mechanism and how will it affect the data
locality aspect for data processing, since erasure coding fragments the data?
3. How mature is the current implementation of erasure coding in HDFS?

Any help will be greatly appreciated.

Thanks and Regards
Pankaj Misra

________________________________






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