Janus Chow created HDFS-16348:
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Summary: Mark slownode as badnode to recover pipeline
Key: HDFS-16348
URL: https://issues.apache.org/jira/browse/HDFS-16348
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Janus Chow
Assignee: Janus Chow
In HDFS-16320, the DataNode can retrieve the SLOW status from each NameNode.
This ticket is to send this information back to Clients who are writing blocks.
If a Clients noticed the pipeline is build on a slownode, he/she can choose to
mark the slownode as a badnode to exclude the node or rebuild a pipeline.
In order to avoid the false positives, we added a config of "threshold", only
clients continuously receives slownode reply from the same node will the node
be marked as SLOW.
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