Dima Spivak created ACCUMULO-4467:
-------------------------------------

             Summary: Random Walk broken because of unmet dependency on 
commons-math
                 Key: ACCUMULO-4467
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4467
             Project: Accumulo
          Issue Type: Bug
          Components: test
    Affects Versions: 1.7.2
            Reporter: Dima Spivak


When trying to run the Random Walk with {{LongEach.xml}} module, I hit a 
failure once we reach the {{Shard.xml}} step:
{code}
16 19:52:05,146 [randomwalk.Framework] ERROR: Error during random walk
java.lang.Exception: Error running node Shard.xml
        at org.apache.accumulo.test.randomwalk.Module.visit(Module.java:346)
        at org.apache.accumulo.test.randomwalk.Framework.run(Framework.java:59)
        at 
org.apache.accumulo.test.randomwalk.Framework.main(Framework.java:119)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.accumulo.start.Main$2.run(Main.java:157)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Error running node shard.BulkInsert
        at org.apache.accumulo.test.randomwalk.Module.visit(Module.java:346)
        at org.apache.accumulo.test.randomwalk.Module$1.call(Module.java:283)
        at org.apache.accumulo.test.randomwalk.Module$1.call(Module.java:278)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at 
org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
        ... 1 more
Caused by: java.lang.Exception: Failed to run map/red verify
        at 
org.apache.accumulo.test.randomwalk.shard.BulkInsert.sort(BulkInsert.java:186)
        at 
org.apache.accumulo.test.randomwalk.shard.BulkInsert.visit(BulkInsert.java:132)
        ... 9 more
{code}

Digging into YARN to see why the MR job became unhappy, I see the following:
{code}
Error: java.lang.ClassNotFoundException: 
org.apache.commons.math.stat.descriptive.SummaryStatistics at 
java.net.URLClassLoader$1.run(URLClassLoader.java:366) at 
java.net.URLClassLoader$1.run(URLClassLoader.java:355) at 
java.security.AccessController.doPrivileged(Native Method) at 
java.net.URLClassLoader.findClass(URLClassLoader.java:354) at 
java.lang.ClassLoader.loadClass(ClassLoader.java:425) at 
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at 
java.lang.ClassLoader.loadClass(ClassLoader.java:358) at 
org.apache.accumulo.core.file.rfile.RFile$Writer.<init>(RFile.java:310) at 
org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:127)
 at 
org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:106)
 at 
org.apache.accumulo.core.file.DispatchingFileFactory.openWriter(DispatchingFileFactory.java:78)
 at 
org.apache.accumulo.core.client.mapreduce.AccumuloFileOutputFormat$1.write(AccumuloFileOutputFormat.java:172)
 at 
org.apache.accumulo.core.client.mapreduce.AccumuloFileOutputFormat$1.write(AccumuloFileOutputFormat.java:152)
 at 
org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:558)
 at 
org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
 at 
org.apache.hadoop.mapreduce.lib.reduce.WrappedReducer$Context.write(WrappedReducer.java:105)
 at org.apache.hadoop.mapreduce.Reducer.reduce(Reducer.java:150) at 
org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171) at 
org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627) at 
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389) at 
org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163) at 
java.security.AccessController.doPrivileged(Native Method) at 
javax.security.auth.Subject.doAs(Subject.java:415) at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1671)
 at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158) 
{code}

It looks like [this 
commit|https://github.com/apache/accumulo/commit/63a8a5d7eec7b0ab6dce107d382143562e21b527]
 introduced a dependency on the {{commons-math}} JAR at runtime (in the RFiles 
Writer class), but tests weren't updated to ensure that the same dependency 
would be put onto the classpath of MR jobs submitted by Random Walk.

Props to [~busbey] for helping to figure out the root cause here. On a separate 
note, we may want to start running this test before releases, as it appears 
this regression also snuck into 1.8.0 and at least one 1.6 release (though, 
since I don't have any easy way to test this against non-1.7.2 cluster, I'm 
limiting the affects versions to what I've confirmed myself). Ping [~kturner], 
who might know the simplest way to fix this.



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