I'm getting below exception in the reduce task of a Pig Script. I have googled it around, but I'm unable to find a reason for this. Could anyone please throw some light on it ?
java.io.IOException: java.lang.IllegalArgumentException: Can not create a Path from an empty string
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:465)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:428)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:408)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:262)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:572)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:414)
at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
Related
I have made report in Jaspersoft studio and it runs without any problem.
Trying to run it from latest jasperstarter:
JasperStarter 3.5.0-java7 Rev 76746ab (JasperStarter-3.5.0-java7)
- JasperReports: 6.4.0
It produces error:
usr#usr-VirtualBox:~/SHARED/PlotJSON$ /home/usr/jasperstarter/bin/jasperstarter pr -t json --data-file plotdata Glavni.jrxml -f pdf -r .
Exception in thread "main" net.sf.jasperreports.engine.JRRuntimeException: net.sf.jasperreports.engine.JRException: Class not found when loading object from InputStream.
at net.sf.jasperreports.repo.SerializedObjectPersistenceService.load(SerializedObjectPersistenceService.java:60)
at net.sf.jasperreports.repo.SerializedReportPersistenceService.load(SerializedReportPersistenceService.java:40)
at net.sf.jasperreports.repo.DefaultRepositoryService.getResource(DefaultRepositoryService.java:149)
at net.sf.jasperreports.repo.RepositoryUtil.getResourceFromLocation(RepositoryUtil.java:144)
at net.sf.jasperreports.repo.RepositoryUtil.getReport(RepositoryUtil.java:112)
at net.sf.jasperreports.engine.fill.JRFillSubreport.loadReport(JRFillSubreport.java:398)
at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluateReport(JRFillSubreport.java:365)
at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluateSubreport(JRFillSubreport.java:427)
at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluate(JRFillSubreport.java:341)
at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:381)
at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:500)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillSummaryNoLastFooterNewPage(JRVerticalFiller.java:1179)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillSummary(JRVerticalFiller.java:1029)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportEnd(JRVerticalFiller.java:286)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:122)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:582)
at net.sf.jasperreports.engine.fill.BaseReportFiller.fill(BaseReportFiller.java:414)
at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:121)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:667)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:983)
at de.cenote.jasperstarter.Report.fillInternal(Report.java:326)
at de.cenote.jasperstarter.Report.fill(Report.java:282)
at de.cenote.jasperstarter.App.processReport(App.java:226)
at de.cenote.jasperstarter.App.main(App.java:109)
Caused by: net.sf.jasperreports.engine.JRException: Class not found when loading object from InputStream.
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:290)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:262)
at net.sf.jasperreports.repo.SerializedObjectPersistenceService.load(SerializedObjectPersistenceService.java:56)
... 23 more
Caused by: java.lang.ClassNotFoundException: net.sf.jasperreports.compilers.ReportExpressionEvaluationData
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:737)
at net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream.resolveClass(ContextClassLoaderObjectInputStream.java:89)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1829)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2120)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2365)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2289)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2147)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2365)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2289)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2147)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:482)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:440)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:278)
... 25 more
Can anyone please give a hint what to do to remedy this situation.
Are there some jar files I should copy from Studio to jasperstarter to make it work?
I'm a new user in RePast learning to run the mesoFON model. I get this error message. What is the problem?
I'm using Eclipse IDE 2018-09.
FATAL [Thread-5] 11:34:18,767 repast.simphony.ui.GUIScheduleRunner -
RunTimeException when running the schedule
Current tick (1.0)
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at repast.simphony.engine.schedule.DynamicTargetAction.execute(DynamicTargetAction.java:72)
at repast.simphony.engine.schedule.DefaultAction.execute(DefaultAction.java:38)
at repast.simphony.engine.schedule.ScheduleGroup.executeList(ScheduleGroup.java:205)
at repast.simphony.engine.schedule.ScheduleGroup.execute(ScheduleGroup.java:231)
at repast.simphony.engine.schedule.Schedule.execute(Schedule.java:352)
at repast.simphony.ui.GUIScheduleRunner$ScheduleLoopRunnable.run(GUIScheduleRunner.java:52)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.reflect.InvocationTargetException
at meso_FON.application.Environment$$FastClassByCGLIB$$fd509841.invoke(<generated>)
at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:53)
at repast.simphony.engine.schedule.DynamicTargetAction.execute(DynamicTargetAction.java:69)
... 6 more
Caused by: java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.base/java.util.TimSort.mergeLo(TimSort.java:781)
at java.base/java.util.TimSort.mergeAt(TimSort.java:518)
at java.base/java.util.TimSort.mergeCollapse(TimSort.java:448)
at java.base/java.util.TimSort.sort(TimSort.java:245)
at java.base/java.util.Arrays.sort(Arrays.java:1515)
at java.base/java.util.ArrayList.sort(ArrayList.java:1749)
at java.base/java.util.Collections.sort(Collections.java:177)
at org.khelekore.prtree.MinMaxNodeGetter.<init>(MinMaxNodeGetter.java:29)
at org.khelekore.prtree.LeafBuilder.getMM(LeafBuilder.java:69)
at org.khelekore.prtree.LeafBuilder.buildLeafs(LeafBuilder.java:34)
at org.khelekore.prtree.PRTree.load(PRTree.java:65)
at meso_FON.application.Environment.getPRTree(Environment.java:423)
at meso_FON.application.Environment.queryPRTree(Environment.java:234)
... 9 more
It appears that there is an issue with a mesoFOM specific-method call. I'd suggest reaching out to the mesoFOM model developers directly to see if they can help.
I am trying to learn Apache Pig. I am sorry if its a lame question.
I have three columns sitename, upcount and downcount.
When I use describe res, I get: res: {sitename: chararray,upcount: int,downcount: int}
What I am trying to do is find site-up percentage of upcount by upcount/(upcount+downcount)
I am unable to figure how do I achieve it. I tried following:
res_sum = foreach res generate sitename, upcount+downcount;
But it gave following error:
Pig Stack Trace
---------------
ERROR 1066: Unable to open iterator for alias res_sum
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias res_sum
at org.apache.pig.PigServer.openIterator(PigServer.java:935)
at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:754)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:376)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:230)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:205)
at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:66)
at org.apache.pig.Main.run(Main.java:565)
at org.apache.pig.Main.main(Main.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.io.IOException: Job terminated with anomalous status FAILED
at org.apache.pig.PigServer.openIterator(PigServer.java:927)
... 13 more
================================================================================
Try
res_sum = foreach res generate sitename, (upcount + downcount) as ud_sum;
if it doesn't work - show your entire script
I have hive query which run successful sometimes but maximum time gives an error "java.io.IOException: Couldn't create proxy provider class org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider"
Below is my error log
java.lang.RuntimeException: java.io.IOException: Couldn't create proxy
provider class org.apache.hadoop.hdfs.server.namenode.ha.Con\
figuredFailoverProxyProvider at
org.apache.hadoop.mapred.lib.CombineFileInputFormat.isSplitable(CombineFileInputFormat.java:154)
at
org.apache.hadoop.mapreduce.lib.input.CombineFileInputFormat.getMoreSplits(CombineFileInputFormat.java:283)
at
org.apache.hadoop.mapreduce.lib.input.CombineFileInputFormat.getSplits(CombineFileInputFormat.java:239)
at
org.apache.hadoop.mapred.lib.CombineFileInputFormat.getSplits(CombineFileInputFormat.java:75)
at
org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileInputFormatShim.getSplits(HadoopShimsSecure.java:336)
at
org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileInputFormatShim.getSplits(HadoopShimsSecure.java:302)
at
org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.getSplits(CombineHiveInputFormat.java:435)
at
org.apache.hadoop.mapreduce.JobSubmitter.writeOldSplits(JobSubmitter.java:525)
at
org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:517)
at
org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:399)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1295) at
org.apache.hadoop.mapreduce.Job$10.run(Job.java:1292) 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:1614)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1292) at
org.apache.hadoop.mapred.JobClient$1.run(JobClient.java:564) at
org.apache.hadoop.mapred.JobClient$1.run(JobClient.java:559) 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:1614)
at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:559)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:550)
at
org.apache.hadoop.hive.ql.exec.mr.ExecDriver.execute(ExecDriver.java:420)
at
org.apache.hadoop.hive.ql.exec.mr.MapRedTask.execute(MapRedTask.java:136)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:153) at
org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:85)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1516) at
org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1283) at
org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1101) at
org.apache.hadoop.hive.ql.Driver.run(Driver.java:924) at
org.apache.hadoop.hive.ql.Driver.run(Driver.java:914) at
org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:269)
at
org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:221)
at
org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:431)
at
org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:367)
at
org.apache.hadoop.hive.cli.CliDriver.processReader(CliDriver.java:464)
at
org.apache.hadoop.hive.cli.CliDriver.processFile(CliDriver.java:474)
at
org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:756)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:694) at
org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:633) 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.hadoop.util.RunJar.main(RunJar.java:212) Caused by:
java.io.IOException: Couldn't create proxy provider class
org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverPr\
oxyProvider at
org.apache.hadoop.hdfs.NameNodeProxies.createFailoverProxyProvider(NameNodeProxies.java:475)
at
org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:148)
at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:632) at
org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:570) at
org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:147)
at
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2596)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367) at
org.apache.hadoop.fs.FileSystem.get(FileSystem.java:169) at
org.apache.hadoop.mapred.lib.CombineFileInputFormat.isSplitable(CombineFileInputFormat.java:151)
... 45 more Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedConstructorAccessor32.newInstance(Unknown
Source) at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at
org.apache.hadoop.hdfs.NameNodeProxies.createFailoverProxyProvider(NameNodeProxies.java:458)
... 53 more Caused by: java.lang.OutOfMemoryError: GC overhead limit
exceeded at java.util.Arrays.copyOf(Arrays.java:2219) at
java.util.ArrayList.grow(ArrayList.java:242) at
java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:216) at
java.util.ArrayList.ensureCapacityInternal(ArrayList.java:208) at
java.util.ArrayList.add(ArrayList.java:440) at
java.lang.String.split(String.java:2288) at
sun.net.util.IPAddressUtil.textToNumericFormatV4(IPAddressUtil.java:47)
at java.net.InetAddress.getAllByName(InetAddress.java:1129) at
java.net.InetAddress.getAllByName(InetAddress.java:1098) at
java.net.InetAddress.getByName(InetAddress.java:1048) at
org.apache.hadoop.security.SecurityUtil$StandardHostResolver.getByName(SecurityUtil.java:474)
at
org.apache.hadoop.security.SecurityUtil.getByName(SecurityUtil.java:461)
at
org.apache.hadoop.net.NetUtils.createSocketAddrForHost(NetUtils.java:235)
at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:215)
at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:163)
at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:152)
at
org.apache.hadoop.hdfs.DFSUtil.getAddressesForNameserviceId(DFSUtil.java:677)
at
org.apache.hadoop.hdfs.DFSUtil.getAddressesForNsIds(DFSUtil.java:645)
at org.apache.hadoop.hdfs.DFSUtil.getAddresses(DFSUtil.java:628) at
org.apache.hadoop.hdfs.DFSUtil.getHaNnRpcAddresses(DFSUtil.java:727)
at
org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider.(ConfiguredFailoverProxyProvider.java:88)
at sun.reflect.GeneratedConstructorAccessor32.newInstance(Unknown
Source) at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at
org.apache.hadoop.hdfs.NameNodeProxies.createFailoverProxyProvider(NameNodeProxies.java:458)
at
org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:148)
at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:632) at
org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:570) at
org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:147)
at
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2596)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367) at
org.apache.hadoop.fs.FileSystem.get(FileSystem.java:169) Job
Submission failed with exception
'java.lang.RuntimeException(java.io.IOException: Couldn't create proxy
provider class org.apac\
he.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider)'
Could anyone tell me why this happen?
I just stumbled across a similar exception myself, and increasing the hive client heap didn't help. I found I was able to clear up the OutOfMemory GC Overhead exception by adding a partition column to the where clause of the query, so I've concluded that having a very large number of splits is causing this exception. I haven't dug into the code, but I believe I've seen this happen with string concatenation in a loop triggering gc thrashing, and something similar might be happening in the CombineHiveInputFormat.getSplits method.
I am using the below command to load the file, when I try to dump or illustrate the loaded data, it fails with the below error. I have checked the sanity of the data, each line contains correct number of delimiters, but when the field is empty the delimiter immediately follows , I tried loading the below single sample line. It does not work.
hs_2_inr = LOAD 'hs_2_inr.dat' USING PigStorage('^') as ( year:chararray, country:chararray, s_no:chararray, hs_8:chararray, hs_8_desc:chararray, prevyr_inr:chararray, curyr_inr:chararray, growth:chararray, dummy:chararray);
Here is the sample data
1997^BOTSWANA^1.^10063001^*RICE PARBOILED^^2.43^^
Below is the exception
2013-06-30 21:02:23,015 [main] ERROR org.apache.pig.pen.AugmentBaseDataVisitor - No (valid) input data found!
java.lang.RuntimeException: No (valid) input data found!
at org.apache.pig.pen.AugmentBaseDataVisitor.visit(AugmentBaseDataVisitor.java:583)
at org.apache.pig.newplan.logical.relational.LOLoad.accept(LOLoad.java:229)
at org.apache.pig.pen.util.PreOrderDepthFirstWalker.depthFirst(PreOrderDepthFirstWalker.java:82)
at org.apache.pig.pen.util.PreOrderDepthFirstWalker.depthFirst(PreOrderDepthFirstWalker.java:84)
at org.apache.pig.pen.util.PreOrderDepthFirstWalker.walk(PreOrderDepthFirstWalker.java:66)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
at org.apache.pig.pen.ExampleGenerator.getExamples(ExampleGenerator.java:180)
at org.apache.pig.PigServer.getExamples(PigServer.java:1180)
at org.apache.pig.tools.grunt.GruntParser.processIllustrate(GruntParser.java:739)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.Illustrate(PigScriptParser.java:626)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:323)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:194)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:170)
at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:69)
at org.apache.pig.Main.run(Main.java:538)
at org.apache.pig.Main.main(Main.java:157)
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:156)
2013-06-30 21:02:23,016 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2997: Encountered IOException. Exception
so how do I load a file with empty fields in pig?
Your code works fine. As you mentioned in your comment, ILLUSTRATE was your problem. Per the docs, ILLUSTRATE wasn't being maintained for a while. Do not rely on it. You shouldn't need it in any non-diagnostic code anyway. Use DESCRIBE instead.
In newer Pig versions, the warning on ILLUSTRATE seems to have gone away, so it may be safe again, but I'd still rely more heavily on DESCRIBE to avoid a source of potential issues. In Pig 0.10, which I'm on, ILLUSTRATE still gave me the same error you received.