This is not a bug.
even if hadoop was path, hive does not use it.
Hive internally uses HADOOP_HOME in the code base. So you will always need
to set that for hive.
Where as for HADOOP clusters, HADOOP_HOME is deprecated but hive still
needs it.
Don't know if that answers your question
Thanks,
Nitin
On Wed, Jul 18, 2012 at 10:01 PM, kulkarni.swar...@gmail.com <
kulkarni.swar...@gmail.com> wrote:
> Hello,
>
> The hive documentation states that either HADOOP_HOME should be set or
> hadoop should be on the path. However for some cases, where HADOOP_HOME was
> not set but hadoop was on path, I have seen this error pop up:
>
> java.io.IOException: *Cannot run program "null/bin/hadoop" *(in directory
> "/root/swarnim/hive-0.9.0-cern1-SNAPSHOT"): java.io.IOException: error=2,
> No such file or directory
> at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
> at java.lang.Runtime.exec(Runtime.java:593)
> at java.lang.Runtime.exec(Runtime.java:431)
> at org.apache.hadoop.hive.ql.exec.MapRedTask.execute(MapRedTask.java:268)
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:134)
> at
> org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
> at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1326)
> at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1118)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:951)
> at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:258)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:215)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:406)
> at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:689)
> at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:557)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
>
> Digging into the code in MapRedTask.java, I found the following
> (simplified):
>
> String *hadoopExec* = conf.getVar(System.getenv("HADOOP_HOME") +
> "/bin/hadoop");
> ...
>
> Runtime.getRuntime().exec(*hadoopExec*, env, new File(workDir));
>
> Clearly, if HADOOP_HOME is not set, the command that it would try to
> execute is "null/bin/hadoop" which is exactly the exception I am getting.
>
> Has anyone else run into this before? Is this a bug?
>
> Thanks,
> --
> Swarnim
>
--
Nitin Pawar
