[HDFS-4982] JournalNode should relogin from keytab before fetching logs from other JNs

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0-beta, 3.0.0-alpha1
• Fix Version/s: 2.1.0-beta
• Component/s: journal-node, security
• Target Version/s: 2.1.0-beta
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 11/Jul/13 23:10
• Updated: 12/May/16 18:13
• Resolved: 12/Jul/13 20:45

Description

We've seen an issue in a secure cluster where, after a failover, the new NN isn't able to properly coordinate QJM recovery. The JNs fail to fetch logs from each other due to apparently not having a Kerberos TGT. It seems that we need to add the checkTGTAndReloginFromKeytab call prior to making the HTTP connection, since the java HTTP stuff doesn't do an automatic relogin