[HDFS-11576] Block recovery will fail indefinitely if recovery time > heartbeat interval

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.7.1, 2.7.2, 2.7.3, 3.0.0-alpha1, 3.0.0-alpha2
• Fix Version/s: 3.0.0, 2.9.1
• Component/s: datanode, hdfs, namenode
• Target Version/s: 2.7.5
• Hadoop Flags: Reviewed
• Assignee: Lukas Majercak
• Reporter: Lukas Majercak
• Created: 24/Mar/17 18:38
• Updated: 23/Jan/21 12:33
• Resolved: 07/Dec/17 08:54

Description

Block recovery will fail indefinitely if the time to recover a block is always longer than the heartbeat interval. Scenario:
1. DN sends heartbeat
2. NN sends a recovery command to DN, recoveryID=X
3. DN starts recovery
4. DN sends another heartbeat
5. NN sends a recovery command to DN, recoveryID=X+1
6. DN calls commitBlockSyncronization after succeeding with first recovery to NN, which fails because X < X+1
...

Issue Links

• is related to: HDFS-15787 Remove unnecessary Lease Renew in FSNamesystem#internalReleaseLease
• relates to: HDFS-5012 replica.getGenerationStamp() may be >= recoveryId