[HDFS-5659] dfsadmin -report doesn't output cache information properly

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 2.3.0
• Component/s: caching
• Assignee: Andrew Wang
• Reporter: Akira Ajisaka
• Created: 12/Dec/13 06:49
• Updated: 12/May/16 18:14
• Resolved: 02/Jan/14 20:12

Description

I tried to cache a file by "hdfs cacheadmin -addDirective".

I thought the file was cached because "CacheUsed" at jmx was more than 0.

{
    "name" : "Hadoop:service=DataNode,name=FSDatasetState-DS-1043926324-172.28.0.102-50010-1385087929296",
    "modelerType" : "org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl",
    "Remaining" : 5604772597760,
    "StorageInfo" : "FSDataset{dirpath='[/hadoop/data1/dfs/data/current, /hadoop/data2/dfs/data/current, /hadoop/data3/dfs/data/current]'}",
    "Capacity" : 5905374474240,
    "DfsUsed" : 11628544,
    "CacheCapacity" : 1073741824,
    "CacheUsed" : 360448,
    "NumFailedVolumes" : 0,
    "NumBlocksCached" : 1,
    "NumBlocksFailedToCache" : 0,
    "NumBlocksFailedToUncache" : 0
  },

But "dfsadmin -report" didn't output the same value as jmx.

Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%