Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/105
```sql
SET mapred.max.split.size=64000000; -- use more mappers to avoid OOM in
mappers
-- Hive on Tez
SET tez.task.resource.memory.mb=3072;
SET hive.tez.java.opts=-server -Xmx2560m -XX:+PrintGCDetails -XX:+UseNUMA
-XX:+UseParallelGC -XX:+HeapDumpOnOutOfMemoryError;
-- Hive on MapReuce
SET mapreduce.map.memory.mb=3072;
SET mapreduce.map.java.opts=-server -Xmx2560m -XX:+PrintGCDetails
-XX:+UseNUMA -XX:+UseParallelGC -XX:+HeapDumpOnOutOfMemoryError;
-- 46 mappers
INSERT OVERWRITE TABLE ffm_model
select
train_ffm(features, label, "-c -iters 10 -factors 4 -feature_hashing 20")
-- 2^20 = 1,048,576 features
from
train
;
```
```
Caused by: java.lang.OutOfMemoryError: Java heap space
at
hivemall.utils.collections.maps.Int2LongOpenHashTable.rehash(Int2LongOpenHashTable.java:320)
at
hivemall.utils.collections.maps.Int2LongOpenHashTable.ensureCapacity(Int2LongOpenHashTable.java:310)
at
hivemall.utils.collections.maps.Int2LongOpenHashTable.preAddEntry(Int2LongOpenHashTable.java:202)
at
hivemall.utils.collections.maps.Int2LongOpenHashTable.put(Int2LongOpenHashTable.java:146)
at
hivemall.fm.FFMStringFeatureMapModel.getV(FFMStringFeatureMapModel.java:168)
at
hivemall.fm.FieldAwareFactorizationMachineModel.predict(FieldAwareFactorizationMachineModel.java:89)
at
hivemall.fm.FieldAwareFactorizationMachineUDTF.trainTheta(FieldAwareFactorizationMachineUDTF.java:194)
at
hivemall.fm.FieldAwareFactorizationMachineUDTF.train(FieldAwareFactorizationMachineUDTF.java:184)
at
hivemall.fm.FactorizationMachineUDTF.process(FactorizationMachineUDTF.java:285)
at
org.apache.hadoop.hive.ql.exec.UDTFOperator.process(UDTFOperator.java:116)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:878)
at
org.apache.hadoop.hive.ql.exec.SelectOperator.process(SelectOperator.java:95)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:878)
at
org.apache.hadoop.hive.ql.exec.TableScanOperator.process(TableScanOperator.java:130)
at
org.apache.hadoop.hive.ql.exec.MapOperator$MapOpCtx.forward(MapOperator.java:149)
at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:489)
at
org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.processRow(MapRecordSource.java:86)
at
org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.pushRecord(MapRecordSource.java:70)
at
org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.run(MapRecordProcessor.java:360)
at
org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:172)
at
org.apache.hadoop.hive.ql.exec.tez.TezProcessor.run(TezProcessor.java:160)
at
org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:370)
at
org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:73)
at
org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:61)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at
org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:61)
at
org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:37)
at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
```
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