We have an apache beam dataflow job that reads the data from Big Query converts them into POJO before writing into Cassandra using Datastax driver. I recently added a new blob column to the table and added a ByteBuffer field to the POJO.
How I am creating the ByteBuffer
String str = objectMapper.writeValueAsString(installSkuAttributes);
byte[] bytes = str.getBytes( StandardCharsets.UTF_8 );
pojo.setInstallAttributes(ByteBuffer.wrap(bytes));
here is the pipeline snippet public void executePipeline() throws Exception {
Pipeline pipeline =
Pipeline.create(jobMetaDataBean.getDataflowPipelineOptions());
.... writeDataToCassandra(installSkuData);
pipeline.run();
After making the necessary changes in the DAO writer I am getting the following exception When I ran the job. I am using Datastax driver
Exception in thread "main" org.apache.beam.sdk.Pipeline$PipelineExecutionException: java.lang.IllegalArgumentException: Forbidden IOException when writing to OutputStream
at org.apache.beam.runners.direct.DirectRunner$DirectPipelineResult.waitUntilFinish(DirectRunner.java:349)
at org.apache.beam.runners.direct.DirectRunner$DirectPipelineResult.waitUntilFinish(DirectRunner.java:319)
at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:210)
at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:66)
at org.apache.beam.sdk.Pipeline.run(Pipeline.java:311)
at org.apache.beam.sdk.Pipeline.run(Pipeline.java:297)
at com.homedepot.productassortment.fullfeed.dataflow.InstallSkusFullFeed.executePipeline(InstallSkusFullFeed.java:216)
at com.homedepot.productassortment.fullfeed.dataflow.InstallSkusFullFeed.main(InstallSkusFullFeed.java:221)
Caused by: java.lang.IllegalArgumentException: Forbidden IOException when writing to OutputStream
at org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:88)
at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:69)
at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:54)
at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:148)
at org.apache.beam.sdk.util.MutationDetectors$CodedValueMutationDetector.<init>(MutationDetectors.java:117)
at org.apache.beam.sdk.util.MutationDetectors.forValueWithCoder(MutationDetectors.java:46)
at org.apache.beam.runners.direct.ImmutabilityCheckingBundleFactory$ImmutabilityEnforcingBundle.add(ImmutabilityCheckingBundleFactory.java:112)
at org.apache.beam.runners.direct.ParDoEvaluator$BundleOutputManager.output(ParDoEvaluator.java:242)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner.outputWindowedValue(SimpleDoFnRunner.java:219)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner.access$700(SimpleDoFnRunner.java:69)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:517)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:505)
at com.homedepot.productassortment.fullfeed.dataflow.InstallSkusFullFeed$PrepareDataForCassandraWrite.processElement(InstallSkusFullFeed.java:160)
Caused by: java.io.NotSerializableException: java.nio.HeapByteBuffer
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at org.apache.beam.sdk.coders.SerializableCoder.encode(SerializableCoder.java:166)
at org.apache.beam.sdk.coders.SerializableCoder.encode(SerializableCoder.java:52)
at org.apache.beam.sdk.coders.IterableLikeCoder.encode(IterableLikeCoder.java:99)
at org.apache.beam.sdk.coders.IterableLikeCoder.encode(IterableLikeCoder.java:60)
at org.apache.beam.sdk.coders.Coder.encode(Coder.java:143)
at org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:85)
at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:69)
at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:54)
at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:148)
at org.apache.beam.sdk.util.MutationDetectors$CodedValueMutationDetector.<init>(MutationDetectors.java:117)
at org.apache.beam.sdk.util.MutationDetectors.forValueWithCoder(MutationDetectors.java:46)
at org.apache.beam.runners.direct.ImmutabilityCheckingBundleFactory$ImmutabilityEnforcingBundle.add(ImmutabilityCheckingBundleFactory.java:112)
at org.apache.beam.runners.direct.ParDoEvaluator$BundleOutputManager.output(ParDoEvaluator.java:242)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner.outputWindowedValue(SimpleDoFnRunner.java:219)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner.access$700(SimpleDoFnRunner.java:69)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:517)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:505)
at com.homedepot.productassortment.fullfeed.dataflow.InstallSkusFullFeed$PrepareDataForCassandraWrite.processElement(InstallSkusFullFeed.java:160)
at com.homedepot.productassortment.fullfeed.dataflow.InstallSkusFullFeed$PrepareDataForCassandraWrite$DoFnInvoker.invokeProcessElement(Unknown Source)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:185)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimpleDoFnRunner.processElement(SimpleDoFnRunner.java:149)
at org.apache.beam.repackaged.beam_runners_direct_java.runners.core.SimplePushbackSideInputDoFnRunner.processElementInReadyWindows(SimplePushbackSideInputDoFnRunner.java:78)
at org.apache.beam.runners.direct.ParDoEvaluator.processElement(ParDoEvaluator.java:189)
at org.apache.beam.runners.direct.DoFnLifecycleManagerRemovingTransformEvaluator.processElement(DoFnLifecycleManagerRemovingTransformEvaluator.java:55)
at org.apache.beam.runners.direct.DirectTransformExecutor.processElements(DirectTransformExecutor.java:161)
at org.apache.beam.runners.direct.DirectTransformExecutor.run(DirectTransformExecutor.java:125)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
The real problem is here:
java.io.NotSerializableException: java.nio.HeapByteBuffer
It's caused by the fact that ByteBuffer isn't serializable, so it couldn't be used for distributed work. You can avoid this by using byte[] directly as your attribute, or implement a wrapper around ByteBuffer that will be serializable.