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Date: Sat, 8 Oct 2011 22:31:29 +0000 (UTC)
From: "Jeff Bean (Created) (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-2422) temporary loss of NFS mount causes NN
 safe mode
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temporary loss of NFS mount causes NN safe mode
-----------------------------------------------

                 Key: HDFS-2422
                 URL: https://issues.apache.org/jira/browse/HDFS-2422
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.20.2, 0.20-append
            Reporter: Jeff Bean


We encountered a situation where the namenode dropped into safe mode after a temporary outage of an NFS mount.

At 12:10 the NFS server goes offline

Oct  8 12:10:05 <namenode> kernel: nfs: server <nfs host> not responding, timed out

This caused the namenode to conclude resource issues:

2011-10-08 12:10:34,848 WARN org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker: Space available on volume '<nfs host>' is 0, which is below the configured reserved amount 104857600

Temporary loss of NFS mount shouldn't cause safemode.

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