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Tsz Wo (Nicholas), SZE commented on HDFS-1606: ---------------------------------------------- Koji Noguchi also has provided a lot of inputs on this. Sorry that I failed to mention it in the [acknowledgement|https://issues.apache.org/jira/browse/HDFS-1606?focusedCommentId=13018958&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13018958]. > 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. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira