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https://issues.apache.org/jira/browse/HDFS-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048837#comment-13048837
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Todd Lipcon commented on HDFS-941:
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Hey Stack. I still don't think this is quite right -- it will now call
verifiedByClient() if the client read the entire byterange, even if the
byterange didn't cover the whole block. I think we need {{if
(datanode.blockScanner != null && blockSender.isBlockReadFully())}}. Also, can
you add back TestDataXceiver? I think that test case would catch this bug.
> Datanode xceiver protocol should allow reuse of a connection
> ------------------------------------------------------------
>
> Key: HDFS-941
> URL: https://issues.apache.org/jira/browse/HDFS-941
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node, hdfs client
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: bc Wong
> Attachments: 941.22.txt, 941.22.txt, 941.22.v2.txt, HDFS-941-1.patch,
> HDFS-941-2.patch, HDFS-941-3.patch, HDFS-941-3.patch, HDFS-941-4.patch,
> HDFS-941-5.patch, HDFS-941-6.22.patch, HDFS-941-6.patch, HDFS-941-6.patch,
> HDFS-941-6.patch, fix-close-delta.txt, hdfs-941.txt, hdfs-941.txt,
> hdfs-941.txt, hdfs-941.txt, hdfs941-1.png
>
>
> Right now each connection into the datanode xceiver only processes one
> operation.
> In the case that an operation leaves the stream in a well-defined state (eg a
> client reads to the end of a block successfully) the same connection could be
> reused for a second operation. This should improve random read performance
> significantly.
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