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https://issues.apache.org/jira/browse/HDFS-9103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14900739#comment-14900739
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Bob Hansen commented on HDFS-9103:
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I think it is important to have a high-level C++ "go read this data" API that
provides a simple async API for reading that embodies good default policies for
failure recovery and cross-block reading. It makes sense to keep them
composible; I will re-work AsycPreadSome to push the ignored node scope into
the ephemeral state and have it managed by the reliable read method.
> Retry reads on DN failure
> -------------------------
>
> Key: HDFS-9103
> URL: https://issues.apache.org/jira/browse/HDFS-9103
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Bob Hansen
> Assignee: Bob Hansen
> Attachments: HDFS-9103.1.patch
>
>
> When AsyncPreadSome fails, add the failed DataNode to the excluded list and
> try again.
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