Stephen Chu created HDFS-7542:
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Summary: Add an option to DFSAdmin -safemode wait to ignore
connection failures
Key: HDFS-7542
URL: https://issues.apache.org/jira/browse/HDFS-7542
Project: Hadoop HDFS
Issue Type: Improvement
Components: tools
Affects Versions: 2.6.0
Reporter: Stephen Chu
Assignee: Stephen Chu
Priority: Minor
Currently, the _dfsadmin -safemode wait_ command aborts when connection to the
NN fails (network glitch, ConnectException when NN is unreachable, EOFException
if network link shut down).
In certain situations, users have asked for an option to make the command
resilient to connection failures. This is useful so that the admin can initiate
the wait command despite the NN not being fully up or survive intermittent
network issues. With this option, the admin can rely on the wait command
continuing to poll instead of aborting.
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