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 <nitinpawar...@gmail.com>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, 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 > > -- Swarnim
