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https://issues.apache.org/jira/browse/HDFS-6450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351346#comment-14351346
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Zhe Zhang commented on HDFS-6450:
---------------------------------
Thanks for the suggestion Colin. Hedged pread is already handling
BlockReaderLocal (by wrapping it as a Future). I guess it's reasonable to do
the same for non-positional read too?
Is it correct to understand hedged vs. non-hedged and positional vs.
non-positional as orthogonal dimensions? If so, the only new requirement in
hedged non-positional read is to utilize and maintain the states (pos,
blockReader).
I'm still getting myself around this complex reader code. So please let me know
if I missed something.
> Support non-positional hedged reads in HDFS
> -------------------------------------------
>
> Key: HDFS-6450
> URL: https://issues.apache.org/jira/browse/HDFS-6450
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.4.0
> Reporter: Colin Patrick McCabe
> Assignee: Liang Xie
> Attachments: HDFS-6450-like-pread.txt
>
>
> HDFS-5776 added support for hedged positional reads. We should also support
> hedged non-position reads (aka regular reads).
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