*Hi,
I have installed hadoop-0.19.2 on my system and I am using Hive to
access the data on HDFS. But when I starting the hadoop server and trying to
print the data stored in the table using hive CLI, it is throwing the
following exception.*
*hive> select * from <table_name>;
FAILED: Unknown exception : org.apache.hadoop.ipc.RemoteException:
org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create
directory /tmp/hive-hadoop/756358679. Name node is in safe mode.*
The ratio of reported blocks 0.1667 has not reached the threshold 0.9990.
Safe mode will be turned off automatically.
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:1773)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:1747)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.mkdirs(NameNode.java:471)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:481)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:894)
*To temporary solve this problem , I am turning Name node from safe mode to
unsafe mode by firing a command "hadoop dfsadmin -safemode leave" on hadoop.
Can someone explain me why this problem is happening and what is the
permanent solution of this problem. Also what are disadvantageous of
running the Name node in an unsafe mode.
Thanking You
Mohan Agarwal
*
