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我安装了一个四节点hadoop集群。在hadoop Webui我可以看到所有的datanode和namenode已启动并正在运行。但是当我在配置单元中运行select count(*) from table_name;
时,查询正在卡住。Map减少工作虽然Hadoop是卡住了
hive> select count(*) from test_hive2;
Query ID = dssbp_20160804124833_ff269da1-6b91-4e46-a1df-460603a5cb98
Total jobs = 1
Launching Job 1 out of 1
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
set mapreduce.job.reduces=<number>
,我很continiously在我的DataNode节点管理器日志和日志蜂巢得到的错误是:
2016-08-04 12:33:31,474 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode1/172.18.128.24:6005. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
的事情,我已经检查:
1.可做到的telnet从数据节点命名节点。
2.可以执行hadoop放置命令。
3.可以在配置单元中创建表并向其中加载数据。
cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
#::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.18.128.24 namenode1 mycluster
172.18.128.25 namenode2
172.18.128.26 datanode1
172.18.128.27 datanode2
如果任何人可以提出可能的解决方案,这将是很大的帮助。
问候, 兰詹
你可以运行一个主机名-f和主机名-i并粘贴输出吗? –