[HDFS-6093] Expose more caching information for debugging by users

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.4.0
• Component/s: caching
• Labels: BB2015-05-TBR
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 12/Mar/14 00:58
• Updated: 06/May/15 03:32

Description

When users submit a new cache directive, it's unclear if the NN has recognized it and is actively trying to cache it, or if it's hung for some other reason. It'd be nice to expose a "pending caching/uncaching" count the same way we expose pending replication work.

It'd also be nice to display the aggregate cache capacity and usage in dfsadmin -report, since we already have have it as a metric and expose it per-DN in report output.

Issue Links

• is related to: HDFS-6106 Reduce default for dfs.namenode.path.based.cache.refresh.interval.ms