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https://issues.apache.org/jira/browse/OOZIE-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044306#comment-15044306
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Rohini Palaniswamy commented on OOZIE-2413:
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+1. Can you rename ensureKerberos() to ensureKerberosLogin() before checking in.
> Kerberos credentials can expire if the KDC is slow to respond
> -------------------------------------------------------------
>
> Key: OOZIE-2413
> URL: https://issues.apache.org/jira/browse/OOZIE-2413
> Project: Oozie
> Issue Type: Bug
> Components: security
> Affects Versions: trunk
> Reporter: Robert Kanter
> Assignee: Robert Kanter
> Fix For: trunk
>
> Attachments: OOZIE-2413.001.patch, OOZIE-2413.002.patch
>
>
> We've seen some very rare cases where Oozie gets a Kerberos error when trying
> to get delegation tokens via the {{Credentials}} mechanism (e.g. getting HS2
> delegation tokens).
> We finally narrowed it down to slow KDC responses, so Oozie's Kerberos
> credentials have expired when it tries to get the delegation token. The
> reason we don't see this with Hadoop clients (DFSClient for HDFS, JobClient
> for MR, etc) is because they call
> {{UserGroupInformation#checkTGTAndReloginFromKeytab()}} before trying to
> connect.
> We should do a similar fix by calling
> {{UserGroupInformation#checkTGTAndReloginFromKeytab()}} before using a
> Credentials implementation.
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