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 volume 'null' is 0, which is below the configured reserved amount 104857600 Thanks, Kishore
