Hi Neelesh,
I've just upgraded our cluster from hadoop-0.20/hive-0.10 to hadoop-1.03(mapr2.1)/hive0.10 and started running into this issue immediately. Strangely is doesn't appear to happen all of the time or be local to any nodes or set of nodes. The only work around I've found so far it to copy the UDF jar into the hadoop/lib directory on each task tracker node. Obviously this is not ideal and I'm still looking for an actual fix. Chris From: neelesh gadhia [mailto:ngad...@yahoo.com] Sent: 14 February 2013 17:04 To: user@hive.apache.org; nitinpawar...@gmail.com Subject: Re: Nullpointer Exception when using UDF Nitin, Below is the code I got/used from <https://issues.apache.org/jira/browse/HIVE-2361> https://issues.apache.org/jira/browse/HIVE-2361/ I have attached the file that has all the UDF's ( of which I am using GenericUDFMax and GenericUDFSum) that fails with same errors at same point. And also realize I tried using other udf (GenericUDFMax) and it fails exactly at the same point. Code for GenericUDFSum as shown below. /** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * <http://www.apache.org/licenses/LICENSE-2.0> http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.nexr.platform.analysis.udf; import org.apache.commons.lang.StringUtils; import org.apache.hadoop.hive.ql.exec.Description; import org.apache.hadoop.hive.ql.exec.UDFArgumentException; import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException; import org.apache.hadoop.hive.ql.metadata.HiveException; import org.apache.hadoop.hive.ql.udf.UDFType; import org.apache.hadoop.hive.ql.udf.generic.GenericUDF; import org.apache.hadoop.hive.serde.Constants; import org.apache.hadoop.hive.serde2.io.DoubleWritable; import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters; import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Conv erter; import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils; import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.ObjectIns pectorCopyOption; import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspe ctorFactory; import org.apache.hadoop.io.LongWritable; import org.apache.hive.pdk.HivePdkUnitTest; import org.apache.hive.pdk.HivePdkUnitTests; @Description(name = "sum", value = "_FUNC_(hash_key, order_by_col1, order_by_col2 ...) " + "- Returns the summed value of group", extended = "Example:\n" + " > SELECT _FUNC_(HASH(p1, p2), order_by_col1, order_by_col2, ... ) FROM (\n" + " > SELECT ~ FROM table DISTRIBUTE BY HASH(p1,p2) SORT BY p1,p2,order_by_col1, order_by_col2 DESC, ... \n" + " > );") @HivePdkUnitTests( setup = "", cleanup = "", cases = { @HivePdkUnitTest( query = "SELECT t.empno, t.deptno, t.sal, nexr_sum(hash(t.deptno),t.sal) as sal_sum" +" FROM (" +" select a.empno, a.deptno, a.sal from emp a" +" distribute by hash(a.deptno)" +" sort BY a.deptno, a.empno" +" ) t;", result ="7782\t10\t2450\t2450\n" +"7839\t10\t5000\t7450\n" +"7934\t10\t1300\t8750\n" +"7369\t20\t800\t800\n" +"7566\t20\t2975\t3775\n" +"7788\t20\t3000\t6775\n" +"7876\t20\t1100\t7875\n" +"7902\t20\t3000\t10875\n" +"7499\t30\t1600\t1600\n" +"7521\t30\t1250\t2850\n" +"7654\t30\t1250\t4100\n" +"7698\t30\t2850\t6950\n" +"7844\t30\t1500\t8450\n" +"7900\t30\t950\t9400") } ) @UDFType(deterministic = false, stateful = true) public class GenericUDFSum extends GenericUDF { private final LongWritable longResult = new LongWritable(); private final DoubleWritable doubleResult = new DoubleWritable(); private ObjectInspector hashOI, valueOI, prevHashStandardOI, resultOI; private Object prevHash; @Override public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException { if (arguments.length != 2) { throw new UDFArgumentException("Exactly two argument is expected."); } for(int i=0;i<arguments.length;i++){ if (arguments[i].getCategory() != ObjectInspector.Category.PRIMITIVE) { throw new UDFArgumentTypeException(i, "Only primitive type arguments are accepted but " + arguments[i].getTypeName() + " is passed."); } } String t = arguments[1].getTypeName(); if (t.equals(Constants.TINYINT_TYPE_NAME)|| t.equals(Constants.SMALLINT_TYPE_NAME)|| t.equals(Constants.INT_TYPE_NAME)|| t.equals(Constants.BIGINT_TYPE_NAME)) { resultOI = PrimitiveObjectInspectorFactory.writableLongObjectInspector; } else if (t.equals(Constants.FLOAT_TYPE_NAME)|| t.equals(Constants.DOUBLE_TYPE_NAME)|| t.equals(Constants.STRING_TYPE_NAME)) { resultOI = PrimitiveObjectInspectorFactory.writableDoubleObjectInspector; } else{ throw new UDFArgumentTypeException(1, "Only numeric or string type arguments are accepted but " + arguments[1].getTypeName() + " is passed."); } longResult.set(0); doubleResult.set(0); hashOI = arguments[0]; valueOI = arguments[1]; prevHashStandardOI=ObjectInspectorUtils.getStandardObjectInspector(hashOI,Ob jectInspectorCopyOption.JAVA); return resultOI; } @Override public Object evaluate(DeferredObject[] arguments) throws HiveException { Object hash = arguments[0].get(); Object value = arguments[1].get(); if (prevHash==null||ObjectInspectorUtils.compare(prevHash,prevHashStandardOI,ha sh,hashOI)!=0) { longResult.set(0); doubleResult.set(0); } prevHash=ObjectInspectorUtils.copyToStandardObject(hash,hashOI, ObjectInspectorCopyOption.JAVA); Converter converter = ObjectInspectorConverters.getConverter(valueOI, resultOI); if(resultOI.getTypeName()==Constants.DOUBLE_TYPE_NAME){ DoubleWritable valueW = (DoubleWritable)converter.convert(value); doubleResult.set(doubleResult.get()+valueW.get()); return doubleResult; } LongWritable valueW = (LongWritable)converter.convert(value); longResult.set(longResult.get()+valueW.get()); return longResult; } @Override public String getDisplayString(String[] children) { return "sum(" + StringUtils.join(children, ',') + ")"; } } _____ From: Nitin Pawar < <mailto:nitinpawar...@gmail.com> nitinpawar...@gmail.com> To: <mailto:user@hive.apache.org> user@hive.apache.org; neelesh gadhia < <mailto:ngad...@yahoo.com> ngad...@yahoo.com> Sent: Thursday, February 14, 2013 8:54 AM Subject: Re: Nullpointer Exception when using UDF Neelesh, Will it be possible for you to share your code? Looks like in your UDF you are not handling NULL as input values. Thanks, Nitin On Thu, Feb 14, 2013 at 10:22 PM, neelesh gadhia <ngad...@yahoo.com> wrote: Hi Dean, Thanks for your response. I reviewed the stack trace. As you mentioned the error shows up at org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator.initialize(ExprN odeGenericFuncEvaluator.java:137) But this probably is a java class that comes with hadoop 1.1.1 and it untouched. Do you think there is a bug with this Java Class for hadoop 1.1.1? or is the way the UDF I have created using the file downloaded from - <https://issues.apache.org/jira/browse/HIVE-2361> https://issues.apache.org/jira/browse/HIVE-2361, may be causing the issue? I read few forums that indicate the class may not be in the classpath for hadoop. Although I confirmed that is not the case. Any further pointers or advise is appreciated. thanks, Neelesh _____ From: Dean Wampler < <mailto:dean.wamp...@thinkbiganalytics.com> dean.wamp...@thinkbiganalytics.com> To: <mailto:user@hive.apache.org> user@hive.apache.org; neelesh gadhia < <mailto:ngad...@yahoo.com> ngad...@yahoo.com> Sent: Thursday, February 14, 2013 6:41 AM Subject: Re: According to your stack trace, you have NullPointerException on line 137 of your UDF. On Thu, Feb 14, 2013 at 2:28 AM, neelesh gadhia <ngad...@yahoo.com> wrote: Hello, I am a Newbie to using UDF's on hive. But implemented these GenericJDF ( <https://issues.apache.org/jira/browse/HIVE-2361> https://issues.apache.org/jira/browse/HIVE-2361 ) on hive 0.9.0 and hadoop 1.1.1. Was able to add jar to hive hive> select * from emp; OK 1 10 1000 2 10 1200 3 12 1500 4 12 300 5 12 1800 6 20 5000 7 20 7000 8 20 10000 Time taken: 0.191 seconds hive> add jar /usr/local/Cellar/hive/0.9.0/libexec/lib/GenUDF.jar; Added /usr/local/Cellar/hive/0.9.0/libexec/lib/GenUDF.jar to class path Added resource: /usr/local/Cellar/hive/0.9.0/libexec/lib/GenUDF.jar hive> create temporary function nexr_sum as 'com.nexr.platform.analysis.udf.GenericUDFSum'; OK Time taken: 0.012 seconds and kicked the sample sql shown below. SELECT t.empno, t.deptno, t.sal, nexr_sum(hash(t.deptno),t.sal) as sal_sum FROM ( select a.empno, a.deptno, a.sal from emp a distribute by hash(a.deptno) sort BY a.deptno, a.empno ) t; The sql failed with errors. Any pointers or advise towards resolving this is much appreciated. 2013-02-13 23:30:18,925 INFO org.apache.hadoop.mapred.JobTracker: Adding task (REDUCE) 'attempt_201302132324_0002_r_000000_3' to tip task_201302132324_0002_r_000000, for tracker 'tracker_192.168.0.151:localhost/ <http://127.0.0.1:50099/> 127.0.0.1:50099' 2013-02-13 23:30:18,925 INFO org.apache.hadoop.mapred.JobTracker: Removing task 'attempt_201302132324_0002_r_000000_2' 2013-02-13 23:30:26,484 INFO org.apache.hadoop.mapred.TaskInProgress: Error from attempt_201302132324_0002_r_000000_3: java.lang.RuntimeException: Error in configuring object at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:486) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:421) at org.apache.hadoop.mapred.Child$4.run(Child.java:255) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.ja va:1136) at org.apache.hadoop.mapred.Child.main(Child.java:249) Caused by: java.lang.reflect.InvocationTargetException 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.ReflectionUtils.setJobConf(ReflectionUtils.java:88) ... 9 more Caused by: java.lang.RuntimeException: Reduce operator initialization failed at org.apache.hadoop.hive.ql.exec.ExecReducer.configure(ExecReducer.java:157) ... 14 more Caused by: java.lang.NullPointerException at org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator.initialize(ExprN odeGenericFuncEvaluator.java:137) at org.apache.hadoop.hive.ql.exec.Operator.initEvaluators(Operator.java:896) at org.apache.hadoop.hive.ql.exec.Operator.initEvaluatorsAndReturnStruct(Operat or.java:922) at org.apache.hadoop.hive.ql.exec.SelectOperator.initializeOp(SelectOperator.ja va:60) at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:357) at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:433) at org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(Operator.java:389 ) at org.apache.hadoop.hive.ql.exec.ExtractOperator.initializeOp(ExtractOperator. java:40) at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:357) at org.apache.hadoop.hive.ql.exec.ExecReducer.configure(ExecReducer.java:150) ... 14 more 2013-02-13 23:30:29,819 INFO org.apache.hadoop.mapred.TaskInProgress: TaskInProgress task_201302132324_0002_r_000000 has failed 4 times. 2013-02-13 23:30:29,820 INFO org.apache.hadoop.mapred.JobInProgress: TaskTracker at '192.168.0.151' turned 'flaky' .... 12 more lines.. Tried different function "GenericUDFMax".. same error. Any pointers/advise, what could be wrong? -- Dean Wampler, Ph.D. thinkbiganalytics.com <http://thinkbiganalytics.com/> +1-312-339-1330 -- Nitin Pawar
