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From "Chris Embree (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4327) Update documentation to more accurately describe Replication Pipelining
Date Wed, 19 Dec 2012 14:03:12 GMT
Chris Embree created HDFS-4327:
----------------------------------

             Summary: Update documentation to more accurately describe Replication Pipelining
                 Key: HDFS-4327
                 URL: https://issues.apache.org/jira/browse/HDFS-4327
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode, documentation
    Affects Versions: 2.0.2-alpha, 1.1.1
            Reporter: Chris Embree
            Priority: Minor


A question was asked on the user list regarding data writes; do we write to disk then forward
or do it async?  
According to Dev. "The received write packet is directly socket-written to the next node's
receiver (async process - we don't wait for it to hit the disk
there), and then written onto the disk of self()."

Documentation here: http://hadoop.apache.org/docs/stable/hdfs_design.html#Replication+Pipelining
is slightly outdated and ambiguous.

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