Hi,
verify that port 9001 is actually a RPC port that Hadoop uses for
communication. A common error is to specify the port where Hadoop's
WebUIs are running. There, HTTP is served, not the Hadoop RPC protocol.
In short: check you are using the right port in all XML config
properties and in-code URLs.
Bernd
On 12.04.12 07:38, Zhixuan Zhu wrote:
HI there,
I'm having some issue when running hadoop with an external jar file.
My testing environment:
Host machine: windows, eclipse 3.3 with hadoop-0.20.2 and plugin, Jre6
Single node hadoop cluster: linux, hadoop-0.20.2, jdk_1.6.0_26
I wrote MyFileInputFormat.class and MyDBOutputFormat.class, which extend
the two DBformat classes to customize my database fetching and loading.
When I add the two files in the same project as my driver and mapper
classes, everything works fine. But when I build the two files into a
separate jar file and make it external library to my driver project
(which do not have the two DB files anymore), I got the errors as posted
below. I put the jar file on both my driver's build path, and in the
$hadoop/lib of my hadoop node. I googled and people said this could be
caused by non-matching hadoop version of jar and driver. But I'm using
exactly the same version for both sides. Any suggestions are highly
appreciated.
Thanks very much,
Grace
java.io.IOException: Call to srvswint4.calpont.com/10.100.4.77:9001
failed on local exception: java.io.EOFException
at org.apache.hadoop.ipc.Client.wrapException(Client.java:1089)
at org.apache.hadoop.ipc.Client.call(Client.java:1057)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:226)
at org.apache.hadoop.mapred.$Proxy0.getProtocolVersion(Unknown
Source)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:369)
at
org.apache.hadoop.mapred.JobClient.createRPCProxy(JobClient.java:486)
at org.apache.hadoop.mapred.JobClient.init(JobClient.java:471)
at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:456)
at
org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1196)
at OutputTest.run(OutputTest.java:98)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at OutputTest.main(OutputTest.java:108)
Caused by: java.io.EOFException
at java.io.DataInputStream.readInt(Unknown Source)
at
org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:781)
at org.apache.hadoop.ipc.Client$Connection.run(Client.java:689)
