[HDFS-5907] BlockPoolSliceStorage trash to handle block deletions during rolling upgrade

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HDFS-5535 (Rolling upgrades)
• Fix Version/s: HDFS-5535 (Rolling upgrades)
• Component/s: datanode
• Target Version/s: HDFS-5535 (Rolling upgrades)
• Hadoop Flags: Reviewed
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 07/Feb/14 18:40
• Updated: 14/Feb/14 16:38
• Resolved: 14/Feb/14 16:38

Description

DN changes when a rolling upgrade is in progress:

1. DataNode should handle block deletions by moving block files to 'trash'.
2. Block files should be restored to their original locations during a rollback.
3. Purge trash when the rolling upgrade is finalized.