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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4425) NameNode low on available disk space
Date Tue, 22 Jan 2013 16:46:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559763#comment-13559763
] 

Steve Loughran commented on HDFS-4425:
--------------------------------------

source of HDFS-1594 lists the parameters
{code}
+  public static final String  DFS_NAMENODE_DU_RESERVED_KEY = "dfs.namenode.resource.du.reserved";
+  public static final long    DFS_NAMENODE_DU_RESERVED_DEFAULT = 1024 * 1024 * 100; // 100
MB
{code}

What could be done is add a wiki entry on the topic and have the log entry point to it.
                
> NameNode low on available disk space
> ------------------------------------
>
>                 Key: HDFS-4425
>                 URL: https://issues.apache.org/jira/browse/HDFS-4425
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.2-alpha, 0.23.5
>            Reporter: project
>            Priority: Minor
>
> Hi,
> Namenode switches into safemode when it has low disk space on the root fs / i have to
manually run a command to leave it. Below are log messages for low space on root / fs. Is
there any parameter so that i can reduce reserved amount.
> 2013-01-21 01:22:52,217 WARN org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker:
Space available on volume '/dev/mapper/vg_lv_root' is 10653696, which is below the configured
reserved amount 104857600
> 2013-01-21 01:22:52,218 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: NameNode
low on available disk space. Entering safe mode.
> 2013-01-21 01:22:52,218 INFO org.apache.hadoop.hdfs.StateChange: STATE* Safe mode is
ON.

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