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Hadoop >> mail # user >> Namenode automatically going to safemode with 2.1.0-beta


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Namenode automatically going to safemode with 2.1.0-beta
Hi,

 I am doing no activity on my single node cluster which is using
2.1.0-beta, and still observed that it has gone to safe mode by itself
after a while. I was looking at the name node log and see many of these
kinds of entries.. Can anything be interpreted from these?

2013-07-12 09:06:11,256 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Starting log segment at
561
2013-07-12 09:07:11,290 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll Edit Log from
9.70.137.114
2013-07-12 09:07:11,290 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Rolling edit logs
2013-07-12 09:07:11,290 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Ending log segment 561
2013-07-12 09:07:11,291 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 1 Number of transactions batched in Syncs:
0 Number of syncs: 2 SyncTimes(ms): 14
2013-07-12 09:07:11,292 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 1 Number of transactions batched in Syncs:
0 Number of syncs: 3 SyncTimes(ms): 15
2013-07-12 09:07:11,293 INFO
org.apache.hadoop.hdfs.server.namenode.FileJournalManager: Finalizing edits
file
/tmp/hadoop-dsadm/dfs/name/current/edits_inprogress_0000000000000000561 ->
/tmp/hadoop-dsadm/dfs/name/current/edits_0000000000000000561-0000000000000000562
2013-07-12 09:07:11,294 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Starting log segment at
563
2013-07-12 09:08:11,397 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll Edit Log from
9.70.137.114
2013-07-12 09:08:11,398 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Rolling edit logs
2013-07-12 09:08:11,398 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Ending log segment 563
2013-07-12 09:08:11,399 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 2 Number of transactions batched in Syncs:
0 Number of syncs: 2 SyncTimes(ms): 11
2013-07-12 09:08:11,400 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 2 Number of transactions batched in Syncs:
0 Number of syncs: 3 SyncTimes(ms): 12
2013-07-12 09:08:11,402 INFO
org.apache.hadoop.hdfs.server.namenode.FileJournalManager: Finalizing edits
file
/tmp/hadoop-dsadm/dfs/name/current/edits_inprogress_0000000000000000563 ->
/tmp/hadoop-dsadm/dfs/name/current/edits_0000000000000000563-0000000000000000564
2013-07-12 09:08:11,402 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Starting log segment at
565
2013-07-12 09:09:11,440 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll Edit Log from
9.70.137.114
2013-07-12 09:09:11,440 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Rolling edit logs
2013-07-12 09:09:11,440 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Ending log segment 565
2013-07-12 09:09:11,440 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 0 Number of transactions batched in Syncs:
0 Number of syncs: 2 SyncTimes(ms): 13
2013-07-12 09:09:11,441 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 0 Number of transactions batched in Syncs:
0 Number of syncs: 3 SyncTimes(ms): 13
And after sometime it said:

2013-07-12 11:03:19,799 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Starting log segment at
795
2013-07-12 11:04:19,826 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll Edit Log from
9.70.137.114
2013-07-12 11:04:19,826 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Rolling edit logs
2013-07-12 11:04:19,827 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Ending log segment 795
2013-07-12 11:04:19,827 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 0 Number of transactions batched in Syncs:
0 Number of syncs: 2 SyncTimes(ms): 12
2013-07-12 11:04:19,827 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Number of transactions: 2
Total time for transactions(ms): 0 Number of transactions batched in Syncs:
0 Number of syncs: 3 SyncTimes(ms): 12
2013-07-12 11:04:19,829 INFO
org.apache.hadoop.hdfs.server.namenode.FileJournalManager: Finalizing edits
file
/tmp/hadoop-dsadm/dfs/name/current/edits_inprogress_0000000000000000795 ->
/tmp/hadoop-dsadm/dfs/name/current/edits_0000000000000000795-0000000000000000796
2013-07-12 11:04:19,829 INFO
org.apache.hadoop.hdfs.server.namenode.FSEditLog: Starting log segment at
797
2013-07-12 11:04:26,002 WARN
org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker: Space
available on volume 'null' is 0, which is below the configured reserved
amount 104857600
2013-07-12 11:04:26,003 WARN
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: NameNode low on
available disk space. Entering safe mode.
2013-07-12 11:04:26,004 INFO org.apache.hadoop.hdfs.StateChange: STATE*
Safe mode is ON.
Resources are low on NN. Please add or free up more resources then turn off
safe mode manually.  NOTE:  If you turn off safe mode before adding
resources, the NN will immediately return to safe mode..
2013-07-12 11:04:31,004 WARN
org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker: Space
available on volume 'null' is 0, which is below the configured reserved
amount 104857600
2013-07-12 11:04:31,005 WARN
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: NameNode low on
available disk space. Already in safe mode.
2013-07-12 11:04:31,005 INFO org.apache.hadoop.hdfs.StateChange: STATE*
Safe mode is ONResources are low on NN. Please add or free up more
resources then turn off safe mode manually.  NOTE:  If you turn off safe
mode before adding resources, the NN will immediately return to safe mode..
2013-07-12 11:04:36,005 WARN
org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker: Space
available on vol