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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8813) Erasure Coding: Client no need to decode missing parity blocks
Date Thu, 23 Jul 2015 12:26:04 GMT
Walter Su created HDFS-8813:
-------------------------------

             Summary: Erasure Coding: Client no need to decode missing parity blocks
                 Key: HDFS-8813
                 URL: https://issues.apache.org/jira/browse/HDFS-8813
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Walter Su
            Assignee: Walter Su
            Priority: Minor


Assume 6+3 schema.
Assume data block #2 is missing, then InputStream tries to read parity block #6.
Assume parity block #6 is missing too. And InputStream successfully reads parity block #7.
Then begin to decode.

Currently InputStream will decode #2 and #6. But client(user) only need #2. The parity block
#6 will be disposed.

The improvement is we only decode #2.



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