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From "Jeff Bean (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2422) temporary loss of NFS mount causes NN safe mode
Date Sat, 08 Oct 2011 22:31:29 GMT
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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