2015-04-22 08:57:13,238 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:57:23,241 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:57:33,244 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:57:43,248 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:57:53,251 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:58:03,254 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:58:13,258 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:58:23,262 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:58:33,266 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:58:43,268 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:58:53,272 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:59:03,276 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:59:13,281 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:59:23,285 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
2015-04-22 08:59:33,287 INFO [master:iiot-test-server1:60000] util.FSUtils: Waiting for dfs to exit safe mode...
解决方法：使用 hadoop dfsadmin -safemode leave 命令使Hadoop退出安全模式。
2015-04-22 09:01:47,264 INFO [master:iiot-test-server1:60000] master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for 58608 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms.
解决方法：暂时没找到好的解决方法，重启hadoop后正常
