Kihwal Lee created HDFS-5584:
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Summary: Add OOB upgrade response and client-side logic for reads
Key: HDFS-5584
URL: https://issues.apache.org/jira/browse/HDFS-5584
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Kihwal Lee
Similarly to HDFS-5583, readers can also benefit from the knowledge that a data
node failure is caused by an upgrade restart. Instead of permanently removing
from the potential data source for the client, it could retry the node more
times before declaring it dead.
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