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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8813) Erasure Coding: Client no need to decode missing parity blocks
Date Thu, 23 Jul 2015 12:28:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Walter Su updated HDFS-8813:
----------------------------
    Attachment: HDFS-8813-HDFS-7285.01.patch

> 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
>         Attachments: HDFS-8813-HDFS-7285.01.patch
>
>
> 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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