trip-discovery sample not working - geometry library not loaded

[trumboosahil]

Yes I run the sample using run-it.sh
I edited the file TripCellDriver.java as below

if (args.length != 5) {
System.out.println("Invalid Arguments");
print_usage();
// throw new IllegalArgumentException();
}
System.out.println("Start Arguments");
int size = args.length;
for (int i=0; i<size; i++)
{
System.out.println(String.valueOf(i) + " * " + args[i]);
}

out put on terminal is

Start Arguments
0 * TripCellDriver
1 * -libjars
2 * ../../lib/esri-geometry-api.jar,../../lib/spatial-sdk-hadoop.jar
3 * 15
4 * 1000
5 * /user/cloudera/trip/data/sample-study-area.json
6 * /user/cloudera/trip/data/sample-vehicle-positions.csv
7 * /user/cloudera/trip/inter
End Arguments

It was giving error are arguments are at wrong place so I adjusted the arguments accordingly and got exception as below

Error: java.lang.ClassNotFoundException: com.esri.core.geometry.SpatialReference
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 TripCellReducer.setup(TripCellReducer.java:138)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:168)
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:167)
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:1554)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)

[randallwhitman]

Hi @trumboosahil - what version of Hadoop are you running? Maybe something has changed in the argument-handling API, such that the generic options are not extracted before the call to TripCellDriver#run.

[trumboosahil]

I'm using hadoop version

Hadoop 2.3.0-cdh5.1.0
Subversion git://github.sf.cloudera.com/CDH/cdh.git -r 8e266e052e423af592871e2dfe09d54c03f6a0e8
Compiled by jenkins on 2014-07-12T13:49Z
Compiled with protoc 2.5.0

[randallwhitman]

Interesting, thanks for the info.
For reference, this is the argument dump I see on our Hadoop-2.2 cluster:

Arguments to TripCellDriver:
0 * 15
1 * 1000
2 * /user/me/trip/data/sample-study-area.json
3 * /user/me/trip/data/sample-vehicle-positions.csv
4 * /user/me/trip/inter

[smambrose]

For reference, argument dump from Hadoop 2.4 on Sandbox 2.1

Arguments to TripCellDriver:
0 * 15
1 * 1000
2 * /user/me/trip/data/sample-study-area.json
3 * /user/me/trip/data/sample-vehicle-positions.csv
4 * /user/me/trip/inter

[randallwhitman]

Do you happen to have easy access to either 2.2 or 2.4 version of Hadoop, for comparison? While it is possible for 2.3 to differ from both 2.2 and 2.4, it would seem unusual. (Here we have 2.2 and 2.4 but not 2.3 currently.)

[randallwhitman]

Idea for workaround:

int argc = args.length;
if (argc > 5 && "TripCellDriver".equals(args[0])) {
    int offset = argc-5;
    for (int ix=0; ix<5; ++ix) {
        args[ix] = args[ix+argc-5];  // shift by argc-5
    }
    argc = 5;  // after adjustment
}
if (argc != 5) {
  ...
}

[randallwhitman]

Regarding the Geometry library (needed for SpatialReference and for much more) not found, the errors may indicate run-it.sh being invoked from a directory other than the one expected (./run-it.sh vs. cmd/run-it.sh) - for which reason the script was updated to be more robust. Let us know if the issue recurs with the latest version from git master.