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Posted to common-dev@hadoop.apache.org by "Yi Liu (JIRA)" <ji...@apache.org> on 2015/05/12 09:16:00 UTC

[jira] [Created] (HADOOP-11961) Add isLinear interface to Erasure coder

Yi Liu created HADOOP-11961:
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             Summary: Add isLinear interface to Erasure coder
                 Key: HADOOP-11961
                 URL: https://issues.apache.org/jira/browse/HADOOP-11961
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Yi Liu
            Assignee: Yi Liu


Today, we have a discussion including [~zhz], [~drankye], etc., also discuss in HDFS-8347.
Some coder like {{RS}} and {{XOR}} is linear, some have coding boundary like HitchHicker.  If the coder is linear, we can decode at any size, and we don't need to padding inputs to *chunksize*,  if the coder is not linear, the inputs need to padding to *chunksize*, then do decode.

This interface is important for performance, and can save memory/disk space since the parity cells are the same as first data cell (less than codec chunksize).  



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