[HDFS-6029] Secondary NN fails to checkpoint after -rollingUpgrade prepare

• 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: Jing Zhao
• Reporter: Haohui Mai
• Created: 27/Feb/14 21:59
• Updated: 28/Feb/14 01:22
• Resolved: 28/Feb/14 01:22

Description

If Secondary NN crashes right after calling dfsadmin -rollingUpgrade prepare, it fails to checkpoint because it fails to download the newest fsimage whose name is fsimage_rollback_txid.

To reproduce this bug:

1. Run NN and SNN.
2. Run dfsadmin -rollingUpgrade prepare.
3. Shutdown SNN, clear all fsimage created by SNN.
4. Restart SNN, SNN tries to download the fsimage_txid instead of fsimage_rollback_txid, resulting the failure.