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https://issues.apache.org/jira/browse/HADOOP-14551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-14551.
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Resolution: Won't Fix
AWS SDK does it's own HEAD on startup; we can't control that at all. WONTFIX
> S3A init hangs if you try to connect while the system is offline
> ----------------------------------------------------------------
>
> Key: HADOOP-14551
> URL: https://issues.apache.org/jira/browse/HADOOP-14551
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 2.9.0
> Reporter: Steve Loughran
> Priority: Minor
>
> F3A init hangs if you try to connect while the system is offline (that is:
> the nost of the s3 endpoint is unknown)
> Assumption: unknown host exception is considered recoverable & client is
> spinning for a long time waiting for it.
> I think we can conclude that unknown host is unrecoverable: if DNS is in
> trouble, you are doomed.
> Proposed: quick lookup of endpoint addr, fail with our wiki diagnostics error
> on any problem.
> I don't see any cost in doing this, as it will guarantee that the endpoint is
> cached in the JVM ready for the AWS client connection. If it can't be found,
> we'll fail within 20+s with something meaningful.
> Noticed during a test run: laptop wifi off; all NICs other than loopback are
> inactive.
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