Thanks for reaching out to the Flink ML.
It reports getMetricStoreProgramHelper as a non-serializable field, even
though it looks a lot like a method. The only recommendation I have for you
is carefully reading the full error message + stack trace.
Your approach of using tagging fields as "transient" is absolutely correct.
There's also this message: NotSerializableException:
java.lang.reflect.Method, but I can not find a field of type Method.
Can you provide a minimal reproducible example of this issue?
On Fri, Feb 12, 2021 at 7:06 AM Debraj Manna <subharaj.ma...@gmail.com>
wrote:
> 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);
> }
> }
>
>
