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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-11550) Ehance ErasureCoder API to support multiple encoding/decoding steps
Date Fri, 06 Mar 2015 07:13:38 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-11550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kai Zheng updated HADOOP-11550:
-------------------------------
    Description: 
In HADOOP-11646, {{ErasureCoder}} API is defined to support encoding/decoding of a block group
considering the most simple but often case that only one coding step is involved. This is
to enhance the API to support complex cases requiring multiple steps for encoding/decoding
of a block group. 

Recovering parity blocks will be supported here also, because it involves at least two steps:
step 1. recover data blocks first; step2. call encoder to compute the erased parity blocks
with all the ready data blocks.

  was:In HDFS-7662, *ErasureCoder* API is defined to support encoding/decoding of a block
group considering the most simple but often case that only one coding step is involved. This
is to ehance the API to support complex cases requiring multiple steps for encoding/decoding
of a block group.


> Ehance ErasureCoder API to support multiple encoding/decoding steps
> -------------------------------------------------------------------
>
>                 Key: HADOOP-11550
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11550
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>
> In HADOOP-11646, {{ErasureCoder}} API is defined to support encoding/decoding of a block
group considering the most simple but often case that only one coding step is involved. This
is to enhance the API to support complex cases requiring multiple steps for encoding/decoding
of a block group. 
> Recovering parity blocks will be supported here also, because it involves at least two
steps: step 1. recover data blocks first; step2. call encoder to compute the erased parity
blocks with all the ready data blocks.



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