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https://issues.apache.org/jira/browse/HDFS-9103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bob Hansen updated HDFS-9103:
-----------------------------
Status: Patch Available (was: Open)
Changes of note:
I changed the semantics of InputStream::PositionRead to be success-or-failure.
It will now retry if there is a Status::exception in the pipeline [Q: will all
I/O errors be reflected as Status::exceptions?]
I exposed Status::Code so we can use the right internal semantics.
I moved the excluded_datanodes to be a member of the InputStream. I think we
would want failed nodes to be remembered across individual reads and not
re-tried. Because it's mutable, I didn't want to be passing copies or mutable
references on the stack.
> 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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