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https://issues.apache.org/jira/browse/HDFS-1606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018958#comment-13018958
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Tsz Wo (Nicholas), SZE commented on HDFS-1606:
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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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