[HDFS-6032] -rollingUpgrade query hits NPE after the NN restarts

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HDFS-5535 (Rolling upgrades)
• Component/s: datanode, ha, hdfs-client, namenode
• Target Version/s: HDFS-5535 (Rolling upgrades)
• Hadoop Flags: Reviewed
• Assignee: Haohui Mai
• Reporter: Haohui Mai
• Created: 28/Feb/14 01:11
• Updated: 28/Feb/14 01:26
• Resolved: 28/Feb/14 01:26

Description

NamenodeRpcServer#rollingUpgrade throws an NPE during query after the NN restarts. It complains that the BlockPoolId in RollingUpgradeInfo equals to null.

Further investigation shows that the BlockPoolId remains uninitialized when FSImage#loadFSImage constructs the RollingUpgradeInfo object, leading to the NPE.