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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-793) DataNode should first receive the whole packet ack message before it constructs and sends its own ack message for the packet
Date Mon, 30 Nov 2009 21:47:20 GMT
DataNode should first receive the whole packet ack message before it constructs and sends its
own ack message for the packet
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                 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


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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