Hive查询HBase这么慢

时间:2013-09-18 20:58:16

标签: mapreduce hbase hive

我想使用Hive查询HBase表的数据,如:

100         column=cf1:val, timestamp=1379536809907, value=val_100

我在hive中输入以下命令:

select * from hbase_table where value = 'val_100';

我相信一切都已经建立起来。当我输入上面的命令时,它会显示如下:

Total MapReduce jobs = 1
Launching Job 1 out of 1
Number of reduce tasks is set to 0 since there's no reduce operator
Starting Job = job_201309031344_0024, Tracking URL =        http://namenode:50030/jobdetails.jsp?jobid=job_201309031344_0024
Kill Command = /usr/libexec/../bin/hadoop job  -kill job_201309031344_0024
Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 0
2013-09-18 14:45:53,815 Stage-1 map = 0%,  reduce = 0%
2013-09-18 14:46:54,654 Stage-1 map = 0%,  reduce = 0%
2013-09-18 14:47:55,449 Stage-1 map = 0%,  reduce = 0%
2013-09-18 14:48:56,193 Stage-1 map = 0%,  reduce = 0%
2013-09-18 14:49:56,990 Stage-1 map = 0%,  reduce = 0%

为什么地图任务始终为0%?它出什么问题了?有没有我配置的地方?

我在datanode日志文件中找到错误:

2013-09-18 15:18:27,415 INFO org.apache.zookeeper.ClientCnxn: 
Opening socket connection to server datanode2/192.168.1.97:2181. 
Will not attempt to authenticate using SASL (unknown error)

2013-09-18 15:18:27,417 WARN org.apache.zookeeper.ClientCnxn: 
Session 0x0 for server null, unexpected error, closing socket 
connection and attempting reconnect java.net.ConnectException: 
Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) 
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:692)
at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350) 
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)

0 个答案:

没有答案