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Tsz Wo (Nicholas), SZE commented on HDFS-1606: ---------------------------------------------- Below are some steps for adding a datanode to a pipeline: # Find a datanode _D_ by some means. # Add _D_ to the existing pipeline. # Continue writing. # Close the pipeline. \\ Moreover, we have to: \(*) Transfer the existing data to _D_. The question is where to put \(*)? > 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 > Reporter: Tsz Wo (Nicholas), SZE > Assignee: Tsz Wo (Nicholas), SZE > > 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