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https://issues.apache.org/jira/browse/HDFS-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-8760:
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Attachment: HDFS-8760.000.patch
Initial patch. Now pread and stateful read implementation has less difference
and I will make further changes to consolidate the code.
As mentioned by [~walter.k.su] in HDFS-8433 we still need to fix the retry
logic in the StripedInputStream. I will leave this part to Walter since he
already has fix for it.
> Erasure Coding: reuse BlockReader when reading the same block in pread
> ----------------------------------------------------------------------
>
> Key: HDFS-8760
> URL: https://issues.apache.org/jira/browse/HDFS-8760
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-8760.000.patch
>
>
> Currently in pread, we create a new block reader for each aligned stripe even
> though these stripes belong to the same block. It's better to reuse them to
> avoid unnecessary block reader creation overhead. This can also avoid reading
> from the same bad DataNode.
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