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https://issues.apache.org/jira/browse/HDFS-9103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14903140#comment-14903140
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Haohui Mai commented on HDFS-9103:
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bq. I propose (perhaps in another jira), that we separate FileHandle (stream
state such as position, previously failed DataNodes, etc.), FileInfo (file
length, LocatedBlocks, etc.), and ReadOperation (ephemeral state for an async
read such as Continuations and refs to FileInfo) as a good model.
This is a good idea. The C layer can be the first consumer of these APIs.
Maybe we can look at the first iterations of the C APIs and come back to this
jira? I think the experience on building the C layer will be valuable in this
jira.
> 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
> Fix For: HDFS-8707
>
> Attachments: HDFS-9103.1.patch, HDFS-9103.2.patch,
> HDFS-9103.HDFS-8707.3.patch, HDFS-9103.HDFS-8707.4.patch,
> HDFS-9103.HDFS-8707.5.patch
>
>
> When AsyncPreadSome fails, add the failed DataNode to the excluded list and
> try again.
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