FAQ
Provide a stronger data guarantee in the write pipeline
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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


In the current design, if there is a datanode/network failures 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 not be accurate under erroneous conditions.

We propose to add a new mechanism for adding new datanodes to the pipeline in order to provide a stronger data guarantee.

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postedJan 31, '11 at 11:42p
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