[HDFS-4449] When a decommission is awaiting closure of live blocks, show the block IDs on the NameNode's UI report

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Yongjun Zhang
• Reporter: Harsh J
• Created: 29/Jan/13 05:27
• Updated: 14/Dec/17 20:55

Description

It is rather common for people to be complaining about 'DN decommission' hangs cause of live blocks waiting to get completed by some app (especially certain HBase specifics cause a file to be open for a longer time, as compared with MR/etc.).

While they can see a count of the blocks that are live, we should add some more details to that view. Particularly add the list of live blocks waiting to be closed, so that a user may understand better on why its hung and also be able to trace back the block to files manually if needed.

Issue Links

• is related to: HDFS-11847 Enhance dfsadmin listOpenFiles command to list files blocking datanode decommissioning