無法啓動Accumulo

Question

我將JDK升級到8後無法運行accumulo。我已更改環境變量。

我能夠啓動hadoop沒有任何問題，我可以訪問數據節點http://localhost:50075（我正在我的本地機器上運行所有）。

而這正是我在accumulo日誌

主題「GC」死了，如果Accumulo初始化不能告訴我得到;無法讀取hdfs：// localhost：9000/accumulo/instance_id上​​的實例ID。

這裏是accumulo啓動腳本的控制檯輸出

/usr/local/accumulo-1.6.1/bin$ ./start-all.sh 
Starting monitor on localhost 
WARN : Max open files on localhost is 1024, recommend 32768 
Starting tablet servers .... done 
Starting tablet server on localhost 
WARN : Max open files on localhost is 1024, recommend 32768 
2016-07-09 21:06:09,723 [fs.VolumeManagerImpl] WARN : dfs.datanode.synconclose set to false in hdfs-site.xml: data loss is possible on system reset or power loss 
2016-07-09 21:06:09,726 [server.Accumulo] INFO : Attempting to talk to zookeeper 
2016-07-09 21:06:09,844 [server.Accumulo] INFO : Zookeeper connected and initialized, attemping to talk to HDFS 
2016-07-09 21:06:09,915 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:06:09,915 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 1.0 seconds 
2016-07-09 21:06:10,917 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:06:10,917 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 2.0 seconds 
2016-07-09 21:06:12,918 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:06:12,918 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 4.0 seconds 
2016-07-09 21:06:16,919 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:06:16,919 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 8.0 seconds 
2016-07-09 21:06:24,920 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:06:24,921 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 16.0 seconds 
2016-07-09 21:06:40,923 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:06:40,923 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 32.0 seconds 
2016-07-09 21:07:12,926 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:07:12,926 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds 
2016-07-09 21:08:12,929 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:08:12,929 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds 
2016-07-09 21:09:12,932 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:09:12,932 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds 
2016-07-09 21:10:12,935 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:10:12,935 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds 
2016-07-09 21:11:12,938 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode 
2016-07-09 21:11:12,938 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds 



Not sure what i am doing wrong..Appreciate any help. 

感謝

Answer 1

該錯誤消息告訴您的NameNode是在安全模式。這通常是因爲HDFS意識到它缺少用於備份在本地文件系統中存儲在HDFS中的文件的塊。請訪問http://localhost:50070的NameNode UI，瞭解NameNode爲什麼不會自動離開安全模式的更多原因。

將NameNode移出安全模式之後，請確認您仍然有HDFS目錄/ accumulo（例如hdfs dfs -ls /accumulo）。

該目錄（和下面的結構）通過運行accumulo init創建。如果該目錄不存在，那意味着您刪除了該HDFS目錄（有意或無意）。

確保已將HDFS配置爲寫入到重新啓動機器時未擦除的目錄（例如，避免/tmp）。