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