Walter Su created HDFS-8813:
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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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