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https://issues.apache.org/jira/browse/HDFS-793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12787709#action_12787709
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Hudson commented on HDFS-793:
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Integrated in Hadoop-Hdfs-trunk-Commit #136 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk-Commit/136/])
. Set the data transfer protocol to be 19.
> DataNode should first receive the whole packet ack message before it
> constructs and sends its own ack message for the packet
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-793
> URL: https://issues.apache.org/jira/browse/HDFS-793
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.20.2, 0.21.0, 0.22.0
>
> Attachments: separateSendRcvAck.patch, separateSendRcvAck1.patch
>
>
> Currently BlockReceiver#PacketResponder interleaves receiving ack message and
> sending ack message for the same packet. It reads a portion of the message,
> sends a portion of its ack, and continues like this until it hits the end of
> the message. The problem is that if it gets an error receiving the ack, it is
> not able to send an ack that reflects the source of the error.
> The PacketResponder should receives the whole packet ack message first and
> then constuct and sends out its ack.
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