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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8136) Client gets and uses EC schema when reads and writes a stripping file
Date Mon, 13 Apr 2015 22:48:12 GMT
Kai Zheng created HDFS-8136:
-------------------------------

             Summary: Client gets and uses EC schema when reads and writes a stripping file
                 Key: HDFS-8136
                 URL: https://issues.apache.org/jira/browse/HDFS-8136
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: HDFS-7285
            Reporter: Kai Zheng
            Assignee: Kai Zheng


Discussed with [~umamaheswararao] and [~vinayrpet], in client when reading and writing a stripping
file, it can invoke a separate call to NameNode to request the EC schema associated with the
EC zone where the file is in. Then the schema can be used to guide the reading and writing.
Currently it uses hard-coded values.

Optionally, as an optimization consideration, client may cache schema info per file or per
zone or per schema name. We could add schema name in {{HdfsFileStatus}} for that.



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