[HDFS-8549] Abort the balancer if an upgrade is in progress

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.8.0, 2.7.4, 3.0.0-alpha1
• Component/s: balancer & mover
• Target Version/s: 2.8.0, 2.7.4
• Hadoop Flags: Reviewed
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 06/Jun/15 00:19
• Updated: 06/Jun/17 00:51
• Resolved: 10/Jun/15 20:43

Description

Running the balancer during an ongoing upgrade has a negative affect, since DNs do not actually delete blocks. This means the balancer is making lots of extra replicas and not actually reducing the disk utilization of over-utilized nodes.

Issue Links

• relates to: HDFS-11808 Backport HDFS-8549 to branch-2.7: Abort the balancer if an upgrade is in progress