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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4229) HDFS can report negative DFS Used on clusters with very small amounts of data
Date Mon, 26 Nov 2012 22:48:58 GMT
Brock Noland created HDFS-4229:
----------------------------------

             Summary: HDFS can report negative DFS Used on clusters with very small amounts
of data
                 Key: HDFS-4229
                 URL: https://issues.apache.org/jira/browse/HDFS-4229
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 2.0.2-alpha
            Reporter: Brock Noland
            Priority: Minor


I had a near empty HDFS instance where I was creating a file and deleting it very quickly.
I noticed that HDFS sometimes reported a negative DFS used.

{noformat}
root@brock0-1 ~]# sudo -u hdfs -i hdfs dfsadmin -report
Configured Capacity: 97233235968 (90.56 GB)
Present Capacity: 84289609707 (78.5 GB)
DFS Remaining: 84426645504 (78.63 GB)
DFS Used: -137035797 (-133824.02 KB)
DFS Used%: -0.16%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0

-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)

Live datanodes:
Name: 127.0.0.1:50010 (localhost)
Hostname: brock0-1.ent.cloudera.com
Decommission Status : Normal
Configured Capacity: 97233235968 (90.56 GB)
DFS Used: -137035797 (-133824.02 KB)
Non DFS Used: 12943626261 (12.05 GB)
DFS Remaining: 84426645504 (78.63 GB)
DFS Used%: -0.14%
DFS Remaining%: 86.83%
Last contact: Thu Nov 22 18:25:37 PST 2012




[root@brock0-1 ~]# sudo -u hdfs -i hdfs dfsadmin -report
Configured Capacity: 97233235968 (90.56 GB)
Present Capacity: 84426973184 (78.63 GB)
DFS Remaining: 84426629120 (78.63 GB)
DFS Used: 344064 (336 KB)
DFS Used%: 0%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0

-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)

Live datanodes:
Name: 127.0.0.1:50010 (localhost)
Hostname: brock0-1.ent.cloudera.com
Decommission Status : Normal
Configured Capacity: 97233235968 (90.56 GB)
DFS Used: 344064 (336 KB)
Non DFS Used: 12806262784 (11.93 GB)
DFS Remaining: 84426629120 (78.63 GB)
DFS Used%: 0%
DFS Remaining%: 86.83%
Last contact: Thu Nov 22 18:28:47 PST 2012
{noformat}

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