Examples with DefaultStreamingContext io.cdap.cdap.etl.spark.streaming.DefaultStreamingContext used on opensource projects

Example 1 with DefaultStreamingContext

use of io.cdap.cdap.etl.spark.streaming.DefaultStreamingContext in project cdap by caskdata.

the class SparkStreamingPipelineRunner method getSource.

@Override
protected SparkCollection<RecordInfo<Object>> getSource(StageSpec stageSpec, FunctionCache.Factory functionCacheFactory, StageStatisticsCollector collector) throws Exception {
    StreamingSource<Object> source;
    if (checkpointsDisabled) {
        PluginFunctionContext pluginFunctionContext = new PluginFunctionContext(stageSpec, sec, collector);
        source = pluginFunctionContext.createPlugin();
    } else {
        // check for macros in any StreamingSource. If checkpoints are enabled,
        // SparkStreaming will serialize all InputDStreams created in the checkpoint, which means
        // the InputDStream is deserialized directly from the checkpoint instead of instantiated through CDAP.
        // This means there isn't any way for us to perform macro evaluation on sources when they are loaded from
        // checkpoints. We can work around this in all other pipeline stages by dynamically instantiating the
        // plugin in all DStream functions, but can't for InputDStreams because the InputDStream constructor
        // adds itself to the context dag. Yay for constructors with global side effects.
        // TODO: (HYDRATOR-1030) figure out how to do this at configure time instead of run time
        MacroEvaluator macroEvaluator = new ErrorMacroEvaluator("Due to spark limitations, macro evaluation is not allowed in streaming sources when checkpointing " + "is enabled.");
        PluginContext pluginContext = new SparkPipelinePluginContext(sec.getPluginContext(), sec.getMetrics(), spec.isStageLoggingEnabled(), spec.isProcessTimingEnabled());
        source = pluginContext.newPluginInstance(stageSpec.getName(), macroEvaluator);
    }
    DataTracer dataTracer = sec.getDataTracer(stageSpec.getName());
    StreamingContext sourceContext = new DefaultStreamingContext(stageSpec, sec, streamingContext);
    JavaDStream<Object> javaDStream = source.getStream(sourceContext);
    if (dataTracer.isEnabled()) {
        // it will create a new function for each RDD, which would limit each RDD but not the entire DStream.
        javaDStream = javaDStream.transform(new LimitingFunction<>(spec.getNumOfRecordsPreview()));
    }
    JavaDStream<RecordInfo<Object>> outputDStream = javaDStream.transform(new CountingTransformFunction<>(stageSpec.getName(), sec.getMetrics(), "records.out", dataTracer)).map(new WrapOutputTransformFunction<>(stageSpec.getName()));
    return new DStreamCollection<>(sec, functionCacheFactory, outputDStream);
}