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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1606) Provide a stronger data guarantee in the write pipeline
Date Tue, 12 Apr 2011 18:14:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018958#comment-13018958
] 

Tsz Wo (Nicholas), SZE commented on HDFS-1606:
----------------------------------------------

h3. Acknowledgement
This work cannot be done without the helps and many discussions of Hadoop contributors including
(in alphabetical order) Dhruba Borthakur, Hairong Kuang, Owen O'Malley, Jitendra Pandey, Sanjay
Radia, Sriram Rao, Suresh Srinivas and Kan Zhang.  I am simply the programmer who has done
the implementation of the great ideas provided by them.

> Provide a stronger data guarantee in the write pipeline
> -------------------------------------------------------
>
>                 Key: HDFS-1606
>                 URL: https://issues.apache.org/jira/browse/HDFS-1606
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node, hdfs client, name-node
>    Affects Versions: 0.23.0
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 0.23.0
>
>         Attachments: h1606_20110210.patch, h1606_20110211.patch, h1606_20110217.patch,
h1606_20110228.patch, h1606_20110404.patch, h1606_20110405.patch, h1606_20110405b.patch, h1606_20110406.patch,
h1606_20110406b.patch, h1606_20110407.patch, h1606_20110407b.patch, h1606_20110407c.patch,
h1606_20110408.patch, h1606_20110408b.patch
>
>
> In the current design, if there is a datanode/network failure in the write pipeline,
DFSClient will try to remove the failed datanode from the pipeline and then continue writing
with the remaining datanodes.  As a result, the number of datanodes in the pipeline is decreased.
 Unfortunately, it is possible that DFSClient may incorrectly remove a healthy datanode but
leave the failed datanode in the pipeline because failure detection may be inaccurate under
erroneous conditions.
> We propose to have a new mechanism for adding new datanodes to the pipeline in order
to provide a stronger data guarantee.

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