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error messages from datanode
Hi,
   below is error messages from datanode, we use CDH4 with redhat6.1, what
the problem?

[root@hadoop2 hadoop-hdfs]# tail -f hadoop-hdfs-datanode-hadoop2.log
2012-10-11 13:44:02,572 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:07,678 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:12,693 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:17,742 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:22,757 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:27,888 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:32,903 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:37,984 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:43,099 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:48,172 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:53,187 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:44:58,302 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:03,303 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:08,399 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:13,514 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:18,620 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:23,685 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:28,725 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:33,773 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:38,871 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:43,920 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:48,976 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:54,091 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:45:59,139 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:04,262 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:09,286 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:14,384 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:19,490 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:24,530 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:29,562 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:34,593 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:39,625 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:44,656 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:49,688 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:54,728 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:46:59,759 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:47:04,849 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:47:09,889 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:47:14,929 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a
new period : work left in prev period : 0.00%
2012-10-11 13:47:20,019 INFO
org.apache.hadoop.hdfs.server.datanod
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB