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https://issues.apache.org/jira/browse/BEAM-10339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
MOHIL updated BEAM-10339:
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Attachment: working-workerlogs.png
screenshot2.png
screenshot1.png
nonworking-workerlogs.png
logging-result6.png
logging-result5.png
logging-result4.png
logging-result3.png
logging-result2.png
logging-result1.png
logging-errSyncingPod.png
> Getting PC: @ 0x7f7490e08602 (unknown) raise and Check failure stack trace:
> ***
> -------------------------------------------------------------------------------
>
> Key: BEAM-10339
> URL: https://issues.apache.org/jira/browse/BEAM-10339
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow, sdk-java-core
> Affects Versions: 2.19.0
> Reporter: MOHIL
> Priority: P1
> Attachments: logging-errSyncingPod.png, logging-result1.png,
> logging-result2.png, logging-result3.png, logging-result4.png,
> logging-result5.png, logging-result6.png, nonworking-workerlogs.png,
> screenshot1.png, screenshot2.png, working-workerlogs.png
>
>
> I am using the BEAM java 2.19.0 version on google dataflow.
>
> Default machine type which is n1-standard-4.
> Didn't set any numWorkerHarnessThreads (I believe beam/dataflow picks it up
> based on number of cores available)
> I recently added 3-4 new PTransformations. to an existing pipeline where I
> read data from BQ for a certain timestamp and create
> PCollectionView<Map<Key,value>> to be used as side input in other PTransforms.
>
> I already had similar PTransforms earlier and pipeline was running fine so
> far. Moment I added new ones, pipeline failed to start with
> {color:#FF0000}PC: @ 0x7f7490e08602 (unknown) raise and Check failure stack
> trace: *** exceptions.{color}
>
> Please find attached screenshots for various logs that I have collected via
> worker logs and error reporting.
>
> *Note: When I enabled streamingEngine (keep machine type as default which is
> n1-standard-2 for streaming engine), issue was gone and pipeline started
> successfully.*
>
> Here is a code snippet which can give idea about kind of transformations and
> window that I am using:
>
> 1: Code listens for some trigger on pubsub topic:
> /**
> * Read From PubSub for topic ANALYTICS_UPDATE and create
> PCollection<String> indicating main pipeline to reload
> * relevant DataAnalyticsData from BQ table
> */
> static class MonitorPubSubForDailyAnalyticsDataStatus extends
> PTransform<PBegin, PCollection<POJORepresentingJobCompleteInfo>> {
> private final String subscriptionName;
> private final String jobProject;
> MonitorPubSubForDailyAnalyticsDataStatus(String subscriptionName,
> String jobProject) {
> this.subscriptionName = subscriptionName;
> this.jobProject = jobProject;
> }
> @Override
> public PCollection<POJORepresentingJobCompleteInfo> expand(PBegin
> input) {
> return input.getPipeline()
> .apply("Read_PubSub_Messages",
> PubsubIO.readMessagesWithAttributesAndMessageId().fromSubscription(subscriptionName))
> .apply("Applying_Windowing", Window.<PubsubMessage>into(new
> GlobalWindows())
>
> .triggering(Repeatedly.forever(AfterPane.elementCountAtLeast(1)))
> .discardingFiredPanes())
> .apply("Read_Update_Status", ParDo.of(new DoFn<PubsubMessage,
> POJORepresentingJobCompleteInfo>() {
> @ProcessElement
> public void processElement(@Element PubsubMessage input,
> OutputReceiver<POJORepresentingJobCompleteInfo> out) {
> /*** Read and CReate ***/
> out.output(POJORepresentingJobCompleteInfo);
>
> }
> }));
> }
> }
> 2: Get Latest Updated and Reload new Updates from various BQ tables using
> google cloud bigquery library
> ([https://cloud.google.com/bigquery/docs/quickstarts/quickstart-client-libraries])
> PCollection<POJORepresentingJobCompleteInfo> analyticsDataStatusUpdates =
> p.apply("Get_Analytics_Data_Status_Updates_pubsub",
> new MonitorPubSubForDailyAnalyticsDataStatus(subscriptionName,
> jobProject));
> 3. Create various PCollectionViews to be used as side input for decorating
> stream of logs coming from Kafka (will be shown later)
> PCollectionView<Map<Stats1Key, Stats1>> Stats1View =
> analyticsDataStatusUpdates
> .apply("Reload_Stats1_FromBQ", new ReadStats1())
> .apply("View_Stats1", View.asSingleton());
> PCollectionView<Map<Stats2Key, Stats2>> Stats2View =
> analyticsDataStatusUpdates
> .apply("Reload_Stats1_FromBQ", new ReadStats2())
> .apply("View_Stats1", View.asSingleton());
> .
> .
> .
> . and so one
> 4. An example of code where we read stats from BQ i.e. in ReadStats1(),
> ReadStats2() and so on
> class ReadStatsS1 extends
> PTransform<PCollection<POJORepresentingJobCompleteInfo>,
> PCollection<Map<Stats1Key, Stats1>>> {
>
> @Override
> public PCollection<Map<Stats1Key, Stats1>>
> expand(PCollection<POJORepresentingJobCompleteInfo> input) {
> return input
> .apply("Read_From_BigQuery", ParDo.of(new BigQueryRread()))
> .apply("Applying_Windowing", Window.<Map<Stats1Key,
> Stats1>>into(new GlobalWindows())
>
> .triggering(Repeatedly.forever(AfterPane.elementCountAtLeast(1)))
> .discardingFiredPanes());
> }
> private class BigQueryRread extends DoFn<POJORepresentingJobCompleteInfo,
> Map<Stats1Key, Stats1>> {
> @ProcessElement
> public void process(@Element POJORepresentingJobCompleteInfo input,
> ProcessContext c) {
> Map<Stats1Key, Stats1> resultMap = new HashMap<>();
>
> try {
> BigQuery bigQueryClient =
> BigQueryOptions.getDefaultInstance().getService();
> String sqlQuery = getSqlQuery(input); ///some method to
> return desired sql query based on info present in input
> QueryJobConfiguration queryJobConfiguration =
>
> QueryJobConfiguration.newBuilder(sqlQuery).setUseLegacySql(false).build();
> // Create a job ID so that we can safely retry.
> JobId jobId = JobId.of(UUID.randomUUID().toString());
> Job queryJob =
> bigQueryClient.create(JobInfo.newBuilder(queryJobConfiguration).setJobId(jobId).build());
> // Wait for the query to complete.
> queryJob = queryJob.waitFor();
> if (queryJob == null) {
> logger.p1Error("Big Query Job no longer exists");
> } else if (queryJob.getStatus().getError() != null) {
> // You can also look at
> queryJob.getStatus().getExecutionErrors() for all
> // errors, not just the latest one.
> logger.p1Error("Big Query job returned error: {}",
> queryJob.getStatus().getError().toString());
> } else {
> //successful case
> logger.info("Parsing results executed by BigQuery");
> // Get the results.
> TableResult result = queryJob.getQueryResults();
> if (null == result ||
> !result.iterateAll().iterator().hasNext()) {
> logger.info("No data found for query: {}", sqlQuery);
> } else {
> // Print all pages of the results.
> for (FieldValueList row : result.iterateAll()) {
> /*** Parse row and create Stats1Key and Stats
> from that row/
> resultMap.put(key, stats);
> }
> }
> }
> }
> } catch (Exception ex) {
> logger.p1Error("Error in executing sql query against Big
> Query", ex);
> }
> logger.info("Emitting map of size: {}", resultMap.size());
> c.output(resultMap);
> }
> }
> As I mentioned before all classes : ReadStats1(), ReadStats2() etc follow
> above code design
> 5. Using KafkaIO we read continuous stream of data from kafka
> PCollection<POJO> Logs =
> p
> .apply("Read__Logs_From_Kafka", KafkaIO.<String, byte[]>read()
> .withBootstrapServers(String.join(",",
> bootstrapServerToConnectTo))
> .withTopic("topic")
> .withKeyDeserializer(StringDeserializer.class)
> .withValueDeserializer(ByteArrayDeserializer.class)
> .withConsumerConfigUpdates(kafkaConsumerProperties)
> .withConsumerFactoryFn(consumerFactoryObj)
> .commitOffsetsInFinalize())
> .apply("Applying_Fixed_Window_Logs", Window.<KafkaRecord<String,
> byte[]>>into(FixedWindows.of(Duration.standardSeconds(10)))
>
> .triggering(Repeatedly.forever(AfterWatermark.pastEndOfWindow().withEarlyFirings(AfterPane.elementCountAtLeast(1))))
> .withAllowedLateness(Duration.standardDays(1))
> .discardingFiredPanes())
> .apply("Convert_KafkaRecord_To_PCollection<POJO>",
> ParDo.of(new ParseLogs());
> 6. Take these logs and apply another Transform providing aforementioned BQ
> reads as side input i.e. something like this
> Logs.apply("decorate", new Decorate().withSideInput(Stats1View,
> Stats2View...);
> *Please Note: I tried commenting out code where I added side input to the
> above transform and still landed up in the same crash. So Issue is definitely
> in adding*
> *more than a certain number of PCollectionView transforms. I already had 3-4
> such transforms and it was working fine. Yesterday I added a few more and
> started seeing crashes.*
> If I enable just one of the newly added PCollectionView transforms (keeping
> old 3-4 intact), then everything works fine. Moment I enable another new
> transform, a crash happens.
>
> *It would be good to know how streamingEngine solved the problem.*
>
>
>
>
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