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Hive >> mail # user >> HADOOP_HOME requirement


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kulkarni.swarnim@...) 2012-07-18, 16:31
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Nitin Pawar 2012-07-18, 16:59
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kulkarni.swarnim@...) 2012-07-18, 17:03
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Re: HADOOP_HOME requirement
this also depends on what version of hive you are using

On Wed, Jul 18, 2012 at 10:33 PM, [EMAIL PROTECTED] <
[EMAIL PROTECTED]> wrote:

> Thanks for your reply nitin.
>
> Ok. So you mean we always need to set HADOOP_HOME irrespective of "hadoop"
> is on the path or not. Correct?
>
> Little confused because that contradicts what's mentioned here[1].
>
> [1]
> https://cwiki.apache.org/confluence/display/Hive/GettingStarted#GettingStarted-RunningHive
>
>
> Thanks,
>
> On Wed, Jul 18, 2012 at 11:59 AM, Nitin Pawar <[EMAIL PROTECTED]>wrote:
>
>> 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, [EMAIL PROTECTED] <
>> [EMAIL PROTECTED]> 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
>>
>>
>
>
> --
> Swarnim
>

--
Nitin Pawar
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kulkarni.swarnim@...) 2012-07-18, 17:08
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Nitin Pawar 2012-07-18, 17:18
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Vinod Singh 2012-07-18, 17:34
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kulkarni.swarnim@...) 2012-07-18, 17:50
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kulkarni.swarnim@...) 2012-07-18, 18:11