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當我在蜂巢命令行中運行：蜂巢工作出現的MapReduce錯誤：致電HMASTER/127.0.0.1到本地主機：44849失敗的連接異常
hive > select count(*) from alogs;
在終端，它顯示以下內容：
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>
Starting Job = job_1417084377943_0009, Tracking URL = http://localhost:8088/proxy/application_1417084377943_0009/
Kill Command = /usr/lib/hadoop/bin/hadoop job -kill job_1417084377943_0009
Hadoop job information for Stage-1: number of mappers: 0; number of reducers: 0
2014-12-02 17:59:44,068 Stage-1 map = 0%, reduce = 0%
Ended Job = job_1417084377943_0009 with errors
Error during job, obtaining debugging information...
**FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask**
MapReduce Jobs Launched:
Stage-Stage-1: HDFS Read: 0 HDFS Write: 0 FAIL
Total MapReduce CPU Time Spent: 0 msec
然後我用的ResourceManager看到錯誤的詳細信息：
Application application_1417084377943_0009 failed 2 times due to Error launching appattempt_1417084377943_0009_000002. Got exception: **java.net.ConnectException: Call From hmaster/127.0.0.1 to localhost:44849 failed on connection exception: java.net.ConnectException: Connection refused;** For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:783)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:730)
at org.apache.hadoop.ipc.Client.call(Client.java:1415)
at org.apache.hadoop.ipc.Client.call(Client.java:1364)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
at com.sun.proxy.$Proxy32.startContainers(Unknown Source)
at org.apache.hadoop.yarn.api.impl.pb.client.ContainerManagementProtocolPBClientImpl.startContainers(ContainerManagementProtocolPBClientImpl.java:96)
at org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.launch(AMLauncher.java:119)
at org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.run(AMLauncher.java:254)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:712)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:529)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:493)
at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:606)
at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:700)
at org.apache.hadoop.ipc.Client$Connection.access$2800(Client.java:367)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1463)
at org.apache.hadoop.ipc.Client.call(Client.java:1382)
... 9 more
. Failing the application.
雖然錯誤通知是詳細編輯不夠，我不知道在哪裏設置配置'localhost：44849'，以及'從hmaster/127.0.0.1到localhost：44849在連接異常時失敗'的含義是什麼？