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https://issues.apache.org/jira/browse/ACCUMULO-4467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15510994#comment-15510994
 ] 

Josh Elser commented on ACCUMULO-4467:
--------------------------------------

bq. My plan for this was to just fix the immediate problem of RandomWalk not 
including commons-math, since AFAICT we hadn't centralized the needed 
dependencies anywhere

That's fine. My point was that we should consolidate it somewhere (this isn't 
the first time we've had problems like this). NBD, if these are separate tasks.

-0 for 1.6 (let it die)
+1 for 1.7
-1 for >=1.8 on the verbatim patch because we start shipping commons-math3 (the 
patch won't work, the spirit of the change is still +1).

> 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: 1.6.6, 1.7.2
>            Reporter: Dima Spivak
>            Assignee: Sean Busbey
>             Fix For: 1.7.3, 1.8.1, 2.0.0
>
>         Attachments: ACCUMULO-4467-1.6.v1.patch, ACCUMULO-4467-1.7.v1.patch
>
>
> 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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