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https://issues.apache.org/jira/browse/HDFS-7966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741145#comment-14741145
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Haohui Mai commented on HDFS-7966:
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I never understand the the performance numbers. What does 4% means in the data?
Do you repeat the experiment multiple times to get a 95% confidence intervals?
Can you please explain them a little bit more? A chart would definitely help.
It looks to me that the test case is only having a single connection performing
reads for a single block? In production it is there are will be tens of
thousands on concurrent reads. Does the thread pool help? How does the current
implementation look like in this scenario?
> New Data Transfer Protocol via HTTP/2
> -------------------------------------
>
> Key: HDFS-7966
> URL: https://issues.apache.org/jira/browse/HDFS-7966
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Haohui Mai
> Assignee: Qianqian Shi
> Labels: gsoc, gsoc2015, mentor
> Attachments: GSoC2015_Proposal.pdf,
> TestHttp2LargeReadPerformance.svg, TestHttp2Performance.svg,
> TestHttp2ReadBlockInsideEventLoop.svg
>
>
> The current Data Transfer Protocol (DTP) implements a rich set of features
> that span across multiple layers, including:
> * Connection pooling and authentication (session layer)
> * Encryption (presentation layer)
> * Data writing pipeline (application layer)
> All these features are HDFS-specific and defined by implementation. As a
> result it requires non-trivial amount of work to implement HDFS clients and
> servers.
> This jira explores to delegate the responsibilities of the session and
> presentation layers to the HTTP/2 protocol. Particularly, HTTP/2 handles
> connection multiplexing, QoS, authentication and encryption, reducing the
> scope of DTP to the application layer only. By leveraging the existing HTTP/2
> library, it should simplify the implementation of both HDFS clients and
> servers.
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