[HDFS-7225] Remove stale block invalidation work when DN re-registers with different UUID

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.7.0, 2.6.1, 3.0.0-alpha1
• Component/s: namenode
• Labels: 2.6.1-candidate
• Target Version/s: 2.7.0
• Assignee: Zhe Zhang
• Reporter: Zhe Zhang
• Created: 10/Oct/14 17:43
• Updated: 30/Aug/16 01:40
• Resolved: 19/Nov/14 06:21

Description

BlockManager#invalidateWorkForOneNode looks up a DataNode by the datanodeUuid and passes the resultant DatanodeDescriptor to InvalidateBlocks#invalidateWork. However, if a wrong or outdated datanodeUuid is used, a null pointer will be passed to invalidateWork which will use it to lookup in a TreeMap. Since the key type is DatanodeDescriptor, key comparison is based on the IP address. A null key will crash the NameNode with an NPE.

Issue Links

• requires: HDFS-7211 Block invalidation work should be ordered