今天在配置好hbase分布環境后，進行shell操作，在創建表時出現了如下錯誤：

ERROR: org.apache.hadoop.hbase.MasterNotRunningException: Retried 7 times

進入hbase目錄下的logs目錄中查看MASTAR的日志信息發現了問題：

2014-03-08 07:14:17,955 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:14:27,964 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:14:37,971 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:14:47,978 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:14:58,003 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:15:08,012 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:15:18,017 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:15:28,026 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:15:38,079 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:15:48,089 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:15:58,092 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:16:08,097 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:16:18,105 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:16:28,116 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:16:38,125 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:16:48,129 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:16:58,137 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
2014-03-08 07:17:08,145 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode..

很明顯hadoop由于某方面原因處于了安全模式！

知道問題的所在了，我們就可以解決問題了！

我們執行命令：hadoop dfsadmin -safemode get查看安全模式的狀態，可以看到：Safe mode is ON！所以接下來我們只需關閉安全模式即可！

執行命令：hadoop dfsadmin -safemode leave即可離開安全模式！

ok,一切搞定！

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