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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-793) DataNode should first receive the whole packet ack message before it constructs and sends its own ack message for the packet
Date Wed, 16 Jun 2010 21:08:32 GMT

     [ https://issues.apache.org/jira/browse/HDFS-793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-793:
-----------------------------

    Affects Version/s:     (was: 0.20-append)

Removing 0.20-append, since it was already applied to 20 branch in the form of HDFS-872.

> 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
>
>         Attachments: separateSendRcvAck-0.20-yahoo.patch, separateSendRcvAck-0.20.patch,
separateSendRcvAck.patch, separateSendRcvAck1.patch, separateSendRcvAck2.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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