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

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

     [ https://issues.apache.org/jira/browse/HADOOP-12065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kai Zheng updated HADOOP-12065:
-------------------------------
    Attachment: HADOOP-12065-HDFS-7285-v1.patch

Updated the patch, minor changes in fact.

> 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
>          Components: io
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>         Attachments: HADOOP-12065-HDFS-7285-v1.patch
>
>
> 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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