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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4327) Update documentation to more accurately describe Replication Pipelining
Date Fri, 28 Dec 2012 00:12:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13540223#comment-13540223
] 

Suresh Srinivas commented on HDFS-4327:
---------------------------------------

Chris, please post a patch for this issue. I will commit it.
                
> 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: 1.1.1, 2.0.2-alpha
>            Reporter: Chris Embree
>            Priority: Minor
>              Labels: documentation
>
> 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 is slightly outdated and ambiguous.

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