temporary loss of NFS mount causes NN safe mode
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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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