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From "dragon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10146) CLONE - Erasure Coding: Client no need to decode missing parity blocks
Date Tue, 15 Mar 2016 08:17:35 GMT
dragon created HDFS-10146:
-----------------------------

             Summary: CLONE - Erasure Coding: Client no need to decode missing parity blocks
                 Key: HDFS-10146
                 URL: https://issues.apache.org/jira/browse/HDFS-10146
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            Assignee: Walter Su
            Priority: Minor
             Fix For: HDFS-7285


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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