Google cloud dataflow 可拆分DoFn导致洗牌密钥过大问题
我正在尝试实现一个Google cloud dataflow 可拆分DoFn导致洗牌密钥过大问题,google-cloud-dataflow,apache-beam,apache-beam-io,Google Cloud Dataflow,Apache Beam,Apache Beam Io,我正在尝试实现一个listflant函数,我使用SimpleDoFn实现了它,该函数工作正常,但用于并行化。我正在将函数转换为可拆分Do函数。我使用DirectRunner在本地运行了一个包含5000个元素的单元测试,而在数据流中运行相同的单元测试时,它失败了,错误如下 Error Details: java.lang.RuntimeException: org.apache.beam.sdk.util.UserCodeException: java.lang.RuntimeException
listflant
函数,我使用SimpleDoFn
实现了它,该函数工作正常,但用于并行化。我正在将函数转换为可拆分Do函数。我使用DirectRunner
在本地运行了一个包含5000个元素的单元测试,而在数据流中运行相同的单元测试时,它失败了,错误如下
Error Details:
java.lang.RuntimeException: org.apache.beam.sdk.util.UserCodeException: java.lang.RuntimeException: java.io.IOException: INVALID_ARGUMENT: Shuffle key too large:3749653 > 1572864
at org.apache.beam.runners.dataflow.worker.GroupAlsoByWindowsParDoFn$1.output (GroupAlsoByWindowsParDoFn.java:184)
at org.apache.beam.runners.dataflow.worker.GroupAlsoByWindowFnRunner$1.outputWindowedValue (GroupAlsoByWindowFnRunner.java:102)
at org.apache.beam.runners.dataflow.worker.util.BatchGroupAlsoByWindowViaIteratorsFn.processElement (BatchGroupAlsoByWindowViaIteratorsFn.java:126)
at org.apache.beam.runners.dataflow.worker.util.BatchGroupAlsoByWindowViaIteratorsFn.processElement (BatchGroupAlsoByWindowViaIteratorsFn.java:54)
at org.apache.beam.runners.dataflow.worker.GroupAlsoByWindowFnRunner.invokeProcessElement (GroupAlsoByWindowFnRunner.java:115)
at org.apache.beam.runners.dataflow.worker.GroupAlsoByWindowFnRunner.processElement (GroupAlsoByWindowFnRunner.java:73)
at org.apache.beam.runners.dataflow.worker.GroupAlsoByWindowsParDoFn.processElement (GroupAlsoByWindowsParDoFn.java:114)
at org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoOperation.process (ParDoOperation.java:44)
at org.apache.beam.runners.dataflow.worker.util.common.worker.OutputReceiver.process (OutputReceiver.java:49)
at org.apache.beam.runners.dataflow.worker.util.common.worker.ReadOperation.runReadLoop (ReadOperation.java:201)
Caused by: org.apache.beam.sdk.util.UserCodeException: java.lang.RuntimeException: java.io.IOException: INVALID_ARGUMENT: Shuffle key too large:3749653 > 1572864
at com.abc.common.batch.functions.AbcListFlattenFn.splitRestriction (AbcListFlattenFn.java:68)
本地DirectRunner和云数据流runner之间的数据差异如下所示
本地的DirectRunner:
public类AbcList实现可序列化{
私人名单ABC;
私有列表XYZ;
}
公共类abclistflattfn扩展了DoFn{
输出(KV.of(abc,input.getXyzs());
}); */
for(long index=tracker.currentRestriction().getFrom();tracker.tryClaim(index);
++索引){
输出(KV.of(input.getAbcs().get(Math.toIntExact(index),input.getXyzs()));
}
}捕获(例外e){
日志错误(“展平AbcList失败”,e);
}
}
@GetInitialRestriction
public OffsetRange getInitialRestriction(AbcList输入){
返回新的偏移范围(0,input.getAbcs().size());
}
@拆分限制
公共无效拆分限制(最终AbcList输入,
最终偏移范围,最终输出接收器(接收机){
列表范围=
range.split(input.getAbcs().size()>5000?5000
:input.getAbcs().size(),2000);
对于(最终偏移范围p:范围){
接收机输出(p);
}
}
@纽特拉克
公共偏移范围跟踪程序(偏移范围){
返回新的OffsetRangeTracker(范围);
}
}
有人能告诉我ListFlant函数有什么问题吗?拆分限制是否导致以下问题?如何解决此洗牌密钥大小问题?洗牌密钥大小限制是由proto大小决定的。为了解决这个问题,您可能希望在SDF之前添加一个改组。改组将帮助您完成第一轮分发。您是否能够解决此问题?
public class AbcList implements Serializable {
private List<Abc> abcs;
private List<Xyz> xyzs;
}
public class AbcListFlattenFn extends DoFn<AbcList, KV<Abc, List<Xyz>> {
@ProcessElement
public void process(@Element AbcList input,
ProcessContext context, RestrictionTracker<OffsetRange, Long> tracker) {
try {
/* Below commented lines are without the Splittable DoFn
input.getAbcs().stream().forEach(abc -> {
context.output(KV.of(abc, input.getXyzs()));
}); */
for (long index = tracker.currentRestriction().getFrom(); tracker.tryClaim(index);
++index) {
context.output(KV.of(input.getAbcs().get(Math.toIntExact(index),input.getXyzs())));
}
} catch (Exception e) {
log.error("Flattening AbcList has failed ", e);
}
}
@GetInitialRestriction
public OffsetRange getInitialRestriction(AbcList input) {
return new OffsetRange(0, input.getAbcs().size());
}
@SplitRestriction
public void splitRestriction(final AbcList input,
final OffsetRange range, final OutputReceiver<OffsetRange> receiver) {
List<OffsetRange> ranges =
range.split(input.getAbcs().size() > 5000 ? 5000
: input.getAbcs().size(), 2000);
for (final OffsetRange p : ranges) {
receiver.output(p);
}
}
@NewTracker
public OffsetRangeTracker newTracker(OffsetRange range) {
return new OffsetRangeTracker(range);
}
}