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Posted to common-issues@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/04/20 02:20:59 UTC

[jira] [Created] (HADOOP-11847) Enhance raw coder allowing to read least required inputs in decoding

Kai Zheng created HADOOP-11847:
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             Summary: Enhance raw coder allowing to read least required inputs in decoding
                 Key: HADOOP-11847
                 URL: https://issues.apache.org/jira/browse/HADOOP-11847
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Kai Zheng
            Assignee: Kai Zheng


This is to enhance raw erasure coder to allow only reading least required inputs while decoding. It will also refine and document the relevant APIs for better understanding and usage. 

This is something planned to do but just got reminded by [~zhz]' s question raised in HDFS-7678, also copied here:
bq.Kai Zheng I have a question about decoding: in a (6+3) schema, if block #2 is missing, and I want to repair it with blocks 0, 1, 3, 4, 5, 8, how should I construct the inputs to RawErasureDecoder#decode?

With this work, hopefully the answer to above question would be obvious.





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