[jira] [Created] (HADOOP-12065) Using more meaningful keys in EC schema

["Kai Zheng (JIRA)" <ji...@apache.org>]

Kai Zheng created HADOOP-12065:
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             Summary: Using more meaningful keys in EC schema
                 Key: HADOOP-12065
                 URL: https://issues.apache.org/jira/browse/HADOOP-12065
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Kai Zheng
            Assignee: Kai Zheng


Commented by [~szetszwo] in HADOOP-12029:
bq. We should also change "k" and "m" in the following to something like "numDataUnits" and "numParityUnits".
{code}
   public static final String NUM_DATA_UNITS_KEY = "k";
   public static final String NUM_PARITY_UNITS_KEY = "m";
{code}
This sounds good to me, as in fact in many erasure coding related papers, discussions, and implementations, though {{k}} and {{m}} are broadly used, the meanings are not consistent. For example, {{m}} can also mean {{numDataUnits + numParityUnits}}, all the rows in the coding matrix. The suggested names are more clear and explicit.



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