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From "Konstantin Boudnik (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-608) BlockReceiver:receivePacket(): packet's header parsing logic is complicated. Refactoring will help w/ testing efforts
Date Wed, 09 Sep 2009 22:23:57 GMT
BlockReceiver:receivePacket(): packet's header parsing logic is complicated. Refactoring will
help w/ testing efforts
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                 Key: HDFS-608
                 URL: https://issues.apache.org/jira/browse/HDFS-608
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Konstantin Boudnik


Current logic of getting an information from a packet header is kinda complicated with all
shifting along the internal data buffer back and forth. 
Besides, an absence of clear API to access a packet header's information makes pipeline testing
effort (even with aspects' application) to be a very complicated or even impossible. 

It'd be very nice to have a separate data container which will keep all the information about
a packet header within and will initialized once when a new packet is acquired. 

In order to speed-up pipeline testing needed for append (HDFS-265) this modification might
implemented in three different states:
- introduce new header structure and refactor receivePacket()
- refactor readNextPacket so it it will acquire next packet in initialize its header
- refactor the sender side to use the packet's header structure as the receiver does.

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