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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