[HDFS-3656] ZKFC may write a null "breadcrumb" znode

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.0.0-alpha
• Component/s: auto-failover
• Assignee: Unassigned
• Reporter: Todd Lipcon
• Created: 13/Jul/12 21:46
• Updated: 14/Aug/13 21:24
• Resolved: 14/Aug/13 21:24

Description

A user reported an NPE trying to read the "breadcrumb" znode in the failover controller. This happened repeatedly, implying that an earlier process set the znode to null - probably some race, though I don't see anything obvious in the code.