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https://issues.apache.org/jira/browse/HDFS-8924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14703956#comment-14703956
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Colin Patrick McCabe commented on HDFS-8924:
--------------------------------------------
One example is a storage appliance which wanted to create a custom
short-circuit read implementation. Creating a new BlockReader does not satisfy
this use-case because this block reader would have to have hardware-specific
code which does not belong in upstream. For example, it would have
dependencies on specific JNI and other libraries for interfacing with the
hardware.
> Add pluggable interface for reading replicas in DFSClient
> ---------------------------------------------------------
>
> Key: HDFS-8924
> URL: https://issues.apache.org/jira/browse/HDFS-8924
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.8.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-8924.001.patch
>
>
> We should add a pluggable interface for reading replicas in the DFSClient.
> This could be used to implement short-circuit reads on systems without file
> descriptors, or for other optimizations.
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