HI
I am having a ProcessFunction like below which is throwing an error like
below whenever I am trying to use it in a opeator . My understanding when
flink initializes the operator dag, it serializes things and sends over to
the taskmanagers.
So I have marked the operator state transient, since the operator state
will be populated within the open() call that gets invoked in each
taskmanager. But I am still getting the serialization exception like below.
Can suggest some ways where I can debug this type of serialization error in
Flink 1.12?
org.apache.flink.api.common.InvalidProgramException: public
com.vnera.programs.metrics.MetricStoreProgramHelper
com.vnera.analytics.engine.MetricStoreMapper.getMetricStoreProgramHelper(com.vnera.resourcemanager.ResourceManager,com.vnera.storage.metrics.TsdbMetricStore$Writer,java.lang.String)
is not serializable. The object probably contains or references non
serializable fields.
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:164)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:132)
...
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:69)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.clean(StreamExecutionEnvironment.java:2000)
at
org.apache.flink.streaming.api.datastream.DataStream.clean(DataStream.java:203)
at
org.apache.flink.streaming.api.datastream.DataStream.process(DataStream.java:681)
at
org.apache.flink.streaming.api.datastream.DataStream.process(DataStream.java:661)
at
com.vnera.analytics.engine.MetricStoreOperator.linkFrom(MetricStoreOperator.java:27)
at
com.vnera.analytics.engine.AnaPipelineStage.link(AnaPipelineStage.java:12)
at
com.vnera.analytics.engine.AnalyticsEngine.createPipeline(AnalyticsEngine.java:106)
at
com.vnera.analytics.engine.source.DerivedMetricCreatorTest.testPipeline(DerivedMetricCreatorTest.java:98)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
...
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
...
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
...
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
...
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
Caused by: java.io.NotSerializableException: java.lang.reflect.Method
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at
org.apache.flink.util.InstantiationUtil.serializeObject(InstantiationUtil.java:624)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:143)
... 45 more
My ProcessFunction looks like below
public class MetricStoreMapper extends
ProcessFunction<SelfDescribingMessageDO, GenericMetricV2> {
private static final String MSG_STALENESS_METRIC_NAME =
VneraMetrics.createMetricName(MetricStoreMapper.class,
"metric_sdm_staleness");
private transient Histogram stalenessHisto =
VneraMetrics.histogram(MSG_STALENESS_METRIC_NAME, VneraMetrics.DD_REPORTER);
private transient MetricStoreProgramHelper metricStoreHelper;
@Override
public void open(Configuration parameters) throws Exception {
ExecutionConfig.GlobalJobParameters jobParams =
getRuntimeContext().getExecutionConfig().getGlobalJobParameters();
Configuration conf =
ParameterTool.fromMap(jobParams.toMap()).getConfiguration();
String taskInstanceId =
getRuntimeContext().getTaskNameWithSubtasks();
MetricStoreFactory.StoreType metStoreType =
conf.getEnum(MetricStoreFactory.StoreType.class,
StoreOptions.METRIC_STORE_TYPE);
TaskManagerState state =
TaskManagerState.getTaskManagerState(ConfigStoreFactory.StoreType.MEMORY,
MetricStoreFactory.StoreType.MEMORY);
ResourceManager rm = state.getResourceManager();
metricStoreHelper = getMetricStoreProgramHelper(rm,
state.getTsdbMetricStore().writer(taskInstanceId),
taskInstanceId);
}
@Override
public void processElement(SelfDescribingMessageDO value, Context ctx,
Collector<GenericMetricV2> out) throws Exception {
MetricStoreProgramHelper.MetricStoreOutput output =
metricStoreHelper.execute(value);
for (SelfDescribingMessageDO sdm : output.outputSdms) {
ctx.output(SideOutputs.metricStoreEvents, sdm);
}
}
@VisibleForTesting
public MetricStoreProgramHelper getMetricStoreProgramHelper(final
ResourceManager rm,
final
TsdbMetricStore.Writer tsdbWriter,
final
String taskInstanceId) {
return new MetricStoreProgramHelper(rm.getConfigStore(),
rm.getDataModel(),
tsdbWriter,
taskInstanceId,
rm.getPolicyManger(),
stalenessHisto);
}
private static ModelKey modelKeyFromConfigKey(ConfigKey ck) {
return ModelKey.create(ck.customerId, ck.objectType, ck.objectId);
}
}
My Operator is like below.
public class MetricStoreOperator implements AnaPipelineStage<GenericMetricV2> {
private transient SingleOutputStreamOperator<GenericMetricV2> metricStream;
private transient final MetricStoreMapper metricStoreMapper;
public MetricStoreOperator(final Configuration jobParams, final
MetricStoreMapper metricStoreMapper) {
this.metricStoreMapper = metricStoreMapper;
}
@Override
public AnaPipelineStage<GenericMetricV2>
linkFrom(AnaPipelineStage<?>... operators) {
AnaPipelineStage<SelfDescribingMessageDO> source =
(AnaPipelineStage<SelfDescribingMessageDO>)
Stream.of(operators).findFirst().get();
DataStream<SelfDescribingMessageDO> sdmStream =
source.getOutputStream();
metricStream = sdmStream.process(metricStoreMapper);
return this;
}
@Override
public DataStream<GenericMetricV2> getOutputStream() {
return metricStream;
}
@Override
public DataStream getSideOutput(OutputTag outTag) {
return metricStream.getSideOutput(outTag);
}
}
