Please pull your FILTER out of GROUP BY and do it earlier http://pig.apache.org/docs/r0.9.1/perf.html#filter
In this case, you could use a FILTER followed by a bincond to introduce a new field "employerOrLocation", then do a group by and include the new field in the GROUP BY clause. Thanks, Prashant On Wed, Mar 21, 2012 at 4:45 PM, Rohini U <[email protected]> wrote: > My input data size is 9GB and I am using 20 machines. > > My grouped criteria has two cases so I want 1) counts by the criteria I > have grouped 2) counts of the two inviduals cases in each of my group. > > So my script in detail is: > > counts = FOREACH grouped { > selectedFields1 = FILTER rawItems BY type="EMPLOYER"; > selectedFields2 = FILTER rawItems BY type="LOCATION"; > GENERATE > FLATTEN(group) as (item1, item2, item3, type) , > SUM(selectedFields1.count) as > selectFields1Count, > SUM(selectedFields2.count) as > selectFields2Count, > COUNT(rawItems) as groupCriteriaCount > > } > > Is there a way way to do this? > > > On Wed, Mar 21, 2012 at 4:29 PM, Dmitriy Ryaboy <[email protected]> > wrote: > > > you are not doing grouping followed by counting. You are doing grouping > > followed by filtering followed by counting. > > Try filtering before grouping. > > > > D > > > > On Wed, Mar 21, 2012 at 12:34 PM, Rohini U <[email protected]> wrote: > > > > > Hi, > > > > > > I have a pig script which does a simple GROUPing followed by couting > and > > I > > > get this error. My data is certaining not that big for it to cause > this > > > out of memory error. Is there a chance that this is because of some > bug ? > > > Did any one come across this kind of error before? > > > > > > I am using pig 0.9.1 with hadoop 0.20.205 > > > > > > My script: > > > rawItems = LOAD 'in' as (item1, item2, item3, type, count); > > > > > > grouped = GROUP rawItems BY (item1, item2, item3, type); > > > > > > counts = FOREACH grouped { > > > selectedFields = FILTER rawItems BY > type="EMPLOYER"; > > > GENERATE > > > FLATTEN(group) as (item1, item2, item3, > > type) , > > > SUM(selectedFields.count) as count > > > > > > } > > > > > > Stack Trace: > > > > > > 2012-03-21 19:19:59,346 FATAL org.apache.hadoop.mapred.Child (main): > > Error > > > running child : java.lang.OutOfMemoryError: GC overhead limit exceeded > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:387) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter.getNext(POFilter.java:95) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:406) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:570) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.PORelationToExprProject.getNext(PORelationToExprProject.java:107) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:570) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:248) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.processInput(POUserFunc.java:159) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:184) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:293) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POCast.getNext(POCast.java:453) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:324) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.processInput(POUserFunc.java:159) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:184) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:281) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:324) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:459) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:427) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:407) > > > at > > > > > > > > > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:261) > > > at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176) > > > at > > > org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:662) > > > at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:425) > > > 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.java:1059) > > > at org.apache.hadoop.mapred.Child.main(Child.java:249) > > > > > > Thanks > > > -Rohini > > > > > > > > > -- > Regards > -Rohini > > -- > ** > People of accomplishment rarely sat back & let things happen to them. They > went out & happened to things - Leonardo Da Vinci >
