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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4229) HDFS can report negative DFS Used on clusters with very small amounts of data
Date Sat, 15 Dec 2012 17:48:14 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brock Noland updated HDFS-4229:
-------------------------------

    Assignee: Brock Noland
      Status: Patch Available  (was: Open)

Marking patch available.
                
> 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: namenode
>    Affects Versions: 2.0.2-alpha
>            Reporter: Brock Noland
>            Assignee: Brock Noland
>            Priority: Minor
>         Attachments: HDFS-4229-0.patch.txt
>
>
> 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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