python - Exception when training data in Predictionio -

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i trying deploy recommendation engine mentioned in quick start guide. completed steps build engine. want train recommendation engine. did mentioned in quick start guide. (execute pio train). got lengthy error log , couldn't paste here. putting first few rows of error.

[info] [console$] using existing engine manifest json @ /home/predictionio/predictionio-0.9.6/bin/myrecommendation/manifest.json [info] [runner$] submission command: /home/predictionio/predictionio-0.9.6/vendors/spark-1.5.1-bin-hadoop2.6/bin/spark-submit --class io.prediction.workflow.createworkflow --jar/predictionio/predictionio-0.9.6/bin/myrecommendation/target/scala-2.10/template-scala-parallel-recommendation_2.10-0.1-snapshot.jar,file:/home/predictionio/predictionio-0.9.6/bndation/target/scala-2.10/template-scala-parallel-recommendation-assembly-0.1-snapshot-deps.jar --files file:/home/predictionio/predictionio-0.9.6/conf/log4j.properties --driver/home/predictionio/predictionio-0.9.6/conf:/home/predictionio/predictionio-0.9.6/lib/postgresql-9.4-1204.jdbc41.jar:/home/predictionio/predictionio-0.9.6/lib/mysql-connector-jav file:/home/predictionio/predictionio-0.9.6/lib/pio-assembly-0.9.6.jar --engine-id qokyfr4rwibijnjabxevsqkkfracyryz --engine-version ed29b3e2074149d483aa85b6b1ea35a52dbbdb9a --et file:/home/predictionio/predictionio-0.9.6/bin/myrecommendation/engine.json --verbosity 0 --json-extractor both --env pio_env_loaded=1,pio_storage_repositories_metadata_name=pfs_basedir=/root/.pio_store,pio_home=/home/predictionio/predictionio-0.9.6,pio_fs_enginesdir=/root/.pio_store/engines,pio_storage_sources_pgsql_url=jdbc:postgresql://localhost/pge_repositories_metadata_source=pgsql,pio_storage_repositories_modeldata_source=pgsql,pio_storage_repositories_eventdata_name=pio_event,pio_storage_sources_pgsql_password=pio,piurces_pgsql_type=jdbc,pio_fs_tmpdir=/root/.pio_store/tmp,pio_storage_sources_pgsql_username=pio,pio_storage_repositories_modeldata_name=pio_model,pio_storage_repositories_eventdgsql,pio_conf_dir=/home/predictionio/predictionio-0.9.6/conf [info] [engine] extracting datasource params... [info] [workflowutils$] no 'name' found. default empty string used. [info] [engine] datasource params: (,datasourceparams(myapp3,none)) [info] [engine] extracting preparator params... [info] [engine] preparator params: (,empty) [info] [engine] extracting serving params... [info] [engine] serving params: (,empty) [warn] [utils] hostname, test-digin resolves loopback address: 127.0.1.1; using 192.168.2.191 instead (on interface p5p1) [warn] [utils] set spark_local_ip if need bind address [info] [remoting] starting remoting [info] [remoting] remoting started; listening on addresses :[akka.tcp://sparkdriver@192.168.2.191:56574] [warn] [metricssystem] using default name dagscheduler source because spark.app.id not set. [info] [engine$] engineworkflow.train [info] [engine$] datasource: duo.datasource@6088451e [info] [engine$] preparator: duo.preparator@1642eeae [info] [engine$] algorithmlist: list(duo.alsalgorithm@a09303) [info] [engine$] data sanity check on. [info] [engine$] duo.trainingdata not support data sanity check. skipping check. [info] [engine$] duo.prepareddata not support data sanity check. skipping check. [warn] [blas] failed load implementation from: com.github.fommil.netlib.nativesystemblas [warn] [blas] failed load implementation from: com.github.fommil.netlib.nativerefblas [warn] [lapack] failed load implementation from: com.github.fommil.netlib.nativesystemlapack [warn] [lapack] failed load implementation from: com.github.fommil.netlib.nativereflapack exception in thread "main" org.apache.spark.sparkexception: job aborted due stage failure: task serialization failed: java.lang.stackoverflowerror java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:1028) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.writeobject(objectoutputstream.java:348) scala.collection.immutable.$colon$colon.writeobject(list.scala:379) sun.reflect.generatedmethodaccessor3.invoke(unknown source) sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) java.lang.reflect.method.invoke(method.java:498) java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:1028) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548)

what can overcome isssue?

your error says java.lang.stackoverflowerror can reduce numiterations parameter in engine.json file. refer this.


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