Hello all,
I was running HDFS in standalone mode where the machine got accidently
turned off. On resuming it back to normal, I got this exception:
===================================================
2011-05-04 11:27:54,441 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 9 on 54310: starting
2011-05-04 11:27:54,470 INFO org.apache.hadoop.ipc.Server: Error register
getProtocolVersion
java.lang.IllegalArgumentException: Duplicate metricsName:getProtocolVersion
at
org.apache.hadoop.metrics.util.MetricsRegistry.add(MetricsRegistry.java:53)
at
org.apache.hadoop.metrics.util.MetricsTimeVaryingRate.<init>(MetricsTimeVaryingRate.java:89)
at
org.apache.hadoop.metrics.util.MetricsTimeVaryingRate.<init>(MetricsTimeVaryingRate.java:99)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:961)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:957)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:955)
2011-05-04 11:33:54,457 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
NameSystem.registerDatanode: node registration from
129.128.184.45:50010storage DS-
1165063231-129.128.184.45-50010-1303260104336
2011-05-04 11:33:54,460 INFO
org.apache.hadoop.net<http://org.apache.hadoop.net.net/>.NetworkTopology:
Adding a new node: /default-rack/129.128.184.45:50010
2011-05-04 11:33:54,472 INFO org.apache.hadoop.hdfs.StateChange: STATE* Safe
mode ON.
The ratio of reported blocks 0.0055 has not reached the threshold 0.9990.
Safe mode will be turned off automatically.
==================================================
I didn't recompile or did anything of that sort (as suggested by some
previous related threads).
I am using the compile version though: 0.20.3.SNAPSHOT (append version).
Interesting thing is it resumes after a gap of 6 minutes.
Can it be a dns issue? Though HBase got restarted it without any glitch.
It may be like I am missing something obvious, please let me know that.
I haven't look at HDFS code yet, but can do so if I get some pointers.
Thanks,
Himanshu
