Kihwal Lee created HDFS-5583:
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Summary: Add OOB upgrade response and client-side logic for writes
Key: HDFS-5583
URL: https://issues.apache.org/jira/browse/HDFS-5583
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Kihwal Lee
Add an ability for data nodes to send an OOB response in order to indicate an
upcoming upgrade-restart. Client should ignore the pipeline error from the node
for a configured amount of time and try reconstruct the pipeline without
excluding the restarted node. If the node does not come back in time, regular
pipeline recovery should happen.
This feature is useful for the applications with a need to keep blocks local.
If the upgrade-restart is fast, the wait is preferable to losing locality. It
could also be used in general instead of the draining-writer strategy.
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