[HDFS-12004] Namenode UI continues to list DNs that have been removed from include and exclude

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 2.3.0
• Assignee: Unassigned
• Reporter: Erik Krogen
• Created: 20/Jun/17 22:41
• Updated: 26/Jun/17 16:16
• Resolved: 26/Jun/17 16:16

Description

Initially in HDFS, after a DN was decommission and subsequently removed from the exclude file (thus removing all references to it), it would still appear in the NN UI as a "dead" node until the NN was restarted. In HDFS-1773, discussion about this was had, and it was decided that the web UI should not show these nodes. However when HDFS-5334 went through and the NN web UI was reimplemented client-side, the behavior reverted back to pre-HDFS-1773, and dead+decommissioned nodes once again showed in the dead list. This can be operationally confusing for the same reasons as discussed in HDFS-1773.

I would like to open this discussion to determine if the regression was intentional or if we should carry forward the logic implemented HDFS-1773 into the new UI.

Issue Links

• duplicates: HDFS-8950 NameNode refresh doesn't remove DataNodes that are no longer in the allowed list
• duplicates: HDFS-11589 Unable to remove dead node after datanode decommission