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Question

我已經建立了一個小型的Hadoop集羣與3個機SecondaryNameNode UI狀態頁：

1. 機（Hadoop1）同時運行NameNode和JobTracker的
2. 機（Hadoop2）正在運行SecondaryNameNode
3. 機（Hadoop3）正在運行的DataNode和TaskTracker共同

寄託都工作得很好，當我檢查的日誌文件。 然而，當我試圖通過鍵入localhost來檢查SecondaryNameNode的工作狀態：機器Hadoop2上50090，它表明：

Unable to connect ....can't establish a connection to the server at localhost:50090. 

任何人都遇到過這樣的問題嗎？

內容上SNN的HDFS-site.xml中：

<configuration> 
<property> 
<name>dfs.replication</name> 
<value>2</value> 
</property> 

<property> 
<name>dfs.http.address</name> 
<value>Hadoop1:50070</value> 
</property> 

<property> 
<name>dfs.secondary.http.address</name> 
<value>Hadoop2:50090</value> 
</property> 
</configuration> 

下面是SNN運行日誌的一部分：

2013-04-23 19:47:00,820 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0 
2013-04-23 19:47:00,987 INFO org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Downloaded file fsimage size 654 bytes. 
2013-04-23 19:47:00,989 INFO org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Downloaded file edits size 4 bytes. 
2013-04-23 19:47:00,989 INFO org.apache.hadoop.hdfs.util.GSet: VM type  = 64-bit 
2013-04-23 19:47:00,989 INFO org.apache.hadoop.hdfs.util.GSet: 2% max memory = 17.77875 MB 
2013-04-23 19:47:00,989 INFO org.apache.hadoop.hdfs.util.GSet: capacity  = 2^21 = 2097152 entries 
2013-04-23 19:47:00,989 INFO org.apache.hadoop.hdfs.util.GSet: recommended=2097152, actual=2097152 
2013-04-23 19:47:00,998 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner=hadoop 
2013-04-23 19:47:00,998 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroup=supergroup 
2013-04-23 19:47:00,998 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isPermissionEnabled=true 
2013-04-23 19:47:00,998 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: dfs.block.invalidate.limit=100 
2013-04-23 19:47:00,999 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s) 
2013-04-23 19:47:00,999 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Caching file names occuring more than 10 times 
2013-04-23 19:47:00,999 INFO org.apache.hadoop.hdfs.server.common.Storage: Number of files = 7 
2013-04-23 19:47:01,000 INFO org.apache.hadoop.hdfs.server.common.Storage: Number of files under construction = 0 
2013-04-23 19:47:01,000 INFO org.apache.hadoop.hdfs.server.common.Storage: Edits file /app/hadoop/tmp/dfs/namesecondary/current/edits of size 4 edits # 0 loaded in 0 seconds. 
2013-04-23 19:47:01,001 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0 
2013-04-23 19:47:01,049 INFO org.apache.hadoop.hdfs.server.common.Storage: Image file of size 654 saved in 0 seconds. 
2013-04-23 19:47:01,334 INFO org.apache.hadoop.hdfs.server.common.Storage: Image file of size 654 saved in 0 seconds. 
2013-04-23 19:47:01,570 INFO org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Posted URL Hadoop1:50070putimage=1&port=50090&machine=Hadoop3&token=-32:145975115:0:1366717621000:1366714020860 
2013-04-23 19:47:01,771 INFO org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Checkpoint done. New Image Size: 654 

Answer 1

先給值dfs.secondary。 http.address在您的SNN的hdfs-site.xml中。另外，我假設你的機器之間沒有啓用防火牆嗎？如果你可以顯示你的日誌，這將有所幫助，我曾經看到有時用戶輸入SNN的錯誤端口號，它們的日誌有所不同，因此會導致連接錯誤。