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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8272) Erasure Coding: simplify the retry logic in DFSStripedInputStream
Date Tue, 28 Apr 2015 20:49:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518015#comment-14518015
] 

Zhe Zhang commented on HDFS-8272:
---------------------------------

Nice work Jing! It's a great idea to optimize / simplify the retry logic. A quick comment
is maybe we should file a separate JIRA for the {{DFSInputStream}} changes (since it's useful
even without the EC feature)? 

> Erasure Coding: simplify the retry logic in DFSStripedInputStream
> -----------------------------------------------------------------
>
>                 Key: HDFS-8272
>                 URL: https://issues.apache.org/jira/browse/HDFS-8272
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: h8272-HDFS-7285.000.patch
>
>
> Currently in DFSStripedInputStream the retry logic is still the same with DFSInputStream.
More specifically, every failed read will try to search for another source node. And an exception
is thrown when no new source node can be identified. This logic is not appropriate for EC
inputstream and can be simplified.



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