Hi All,
 
I am running the Pi Estimator from hadoop-examples.jar in my 11 node CDH3u4 cluster.
 
Initially I ran the job for 10 maps and 1000000 samples per map and it ran fine and displayed the execution time and the pi value in the console.
Now again when I ran it for 88 maps and 1 trillion total samples (i.e., 11363636364 samples per map), it executed the job sucessfully, but at end gave the following error and could not display the "pi value" in the console:
 
java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
 at java.math.BigDecimal.divide(BigDecimal.java:1603)
 at org.apache.hadoop.examples.PiEstimator.estimate(PiEstimator.java:313)
 at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:342)
 at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
 at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:351)
 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.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
 at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
 at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
 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:197)
Can anyone tell me where is it going wrong?
Note: My Hadoop cluster (CDH3u4) contains all the necessary patches.
 
Thanks,
Gaurav Dasgupta