Examples with MultiInputTaggedSplit co.cask.cdap.internal.app.runtime.batch.dataset.input.MultiInputTaggedSplit used on opensource projects

Example 1 with MultiInputTaggedSplit

use of co.cask.cdap.internal.app.runtime.batch.dataset.input.MultiInputTaggedSplit in project cdap by caskdata.

the class MapperWrapper method createAutoFlushingContext.

private WrappedMapper.Context createAutoFlushingContext(final Context context, final BasicMapReduceTaskContext basicMapReduceContext) {
    // NOTE: we will change auto-flush to take into account size of buffered data, so no need to do/test a lot with
    //       current approach
    final int flushFreq = context.getConfiguration().getInt("c.mapper.flush.freq", 10000);
    @SuppressWarnings("unchecked") WrappedMapper.Context flushingContext = new WrappedMapper().new Context(context) {

        private int processedRecords = 0;

        @Override
        public boolean nextKeyValue() throws IOException, InterruptedException {
            boolean result = super.nextKeyValue();
            if (++processedRecords > flushFreq) {
                try {
                    LOG.trace("Flushing dataset operations...");
                    basicMapReduceContext.flushOperations();
                } catch (Exception e) {
                    LOG.error("Failed to persist changes", e);
                    throw Throwables.propagate(e);
                }
                processedRecords = 0;
            }
            return result;
        }

        @Override
        public InputSplit getInputSplit() {
            InputSplit inputSplit = super.getInputSplit();
            if (inputSplit instanceof TaggedInputSplit) {
                // expose the delegate InputSplit to the user
                inputSplit = ((TaggedInputSplit) inputSplit).getInputSplit();
            }
            return inputSplit;
        }

        @Override
        public Class<? extends InputFormat<?, ?>> getInputFormatClass() throws ClassNotFoundException {
            InputSplit inputSplit = super.getInputSplit();
            if (inputSplit instanceof MultiInputTaggedSplit) {
                // expose the delegate InputFormat to the user
                return ((MultiInputTaggedSplit) inputSplit).getInputFormatClass();
            }
            return super.getInputFormatClass();
        }
    };
    return flushingContext;
}

Example 2 with MultiInputTaggedSplit

use of co.cask.cdap.internal.app.runtime.batch.dataset.input.MultiInputTaggedSplit in project cdap by caskdata.

the class MapperWrapper method run.

@SuppressWarnings("unchecked")
@Override
public void run(Context context) throws IOException, InterruptedException {
    MapReduceClassLoader classLoader = MapReduceClassLoader.getFromConfiguration(context.getConfiguration());
    ClassLoader weakReferenceClassLoader = new WeakReferenceDelegatorClassLoader(classLoader);
    BasicMapReduceTaskContext basicMapReduceContext = classLoader.getTaskContextProvider().get(context);
    String program = basicMapReduceContext.getProgramName();
    // this is a hook for periodic flushing of changes buffered by datasets (to avoid OOME)
    WrappedMapper.Context flushingContext = createAutoFlushingContext(context, basicMapReduceContext);
    basicMapReduceContext.setHadoopContext(flushingContext);
    InputSplit inputSplit = context.getInputSplit();
    if (inputSplit instanceof MultiInputTaggedSplit) {
        basicMapReduceContext.setInputContext(InputContexts.create((MultiInputTaggedSplit) inputSplit));
    }
    ClassLoader programClassLoader = classLoader.getProgramClassLoader();
    Mapper delegate = createMapperInstance(programClassLoader, getWrappedMapper(context.getConfiguration()), context, program);
    // injecting runtime components, like datasets, etc.
    try {
        Reflections.visit(delegate, delegate.getClass(), new PropertyFieldSetter(basicMapReduceContext.getSpecification().getProperties()), new MetricsFieldSetter(basicMapReduceContext.getMetrics()), new DataSetFieldSetter(basicMapReduceContext));
    } catch (Throwable t) {
        Throwable rootCause = Throwables.getRootCause(t);
        USERLOG.error("Failed to initialize program '{}' with error: {}. Please check the system logs for more details.", program, rootCause.getMessage(), rootCause);
        throw new IOException(String.format("Failed to inject fields to %s", delegate.getClass()), t);
    }
    ClassLoader oldClassLoader;
    if (delegate instanceof ProgramLifecycle) {
        oldClassLoader = ClassLoaders.setContextClassLoader(weakReferenceClassLoader);
        try {
            ((ProgramLifecycle) delegate).initialize(new MapReduceLifecycleContext(basicMapReduceContext));
        } catch (Exception e) {
            Throwable rootCause = Throwables.getRootCause(e);
            USERLOG.error("Failed to initialize program '{}' with error: {}. Please check the system logs for more " + "details.", program, rootCause.getMessage(), rootCause);
            throw new IOException(String.format("Failed to initialize mapper with %s", basicMapReduceContext), e);
        } finally {
            ClassLoaders.setContextClassLoader(oldClassLoader);
        }
    }
    oldClassLoader = ClassLoaders.setContextClassLoader(weakReferenceClassLoader);
    try {
        delegate.run(flushingContext);
    } finally {
        ClassLoaders.setContextClassLoader(oldClassLoader);
    }
    // memory by tx agent)
    try {
        basicMapReduceContext.flushOperations();
    } catch (Exception e) {
        throw new IOException("Failed to flush operations at the end of mapper of " + basicMapReduceContext, e);
    }
    // Close all writers created by MultipleOutputs
    basicMapReduceContext.closeMultiOutputs();
    if (delegate instanceof ProgramLifecycle) {
        oldClassLoader = ClassLoaders.setContextClassLoader(weakReferenceClassLoader);
        try {
            ((ProgramLifecycle<? extends RuntimeContext>) delegate).destroy();
        } catch (Exception e) {
            LOG.error("Error during destroy of mapper {}", basicMapReduceContext, e);
        // Do nothing, try to finish
        } finally {
            ClassLoaders.setContextClassLoader(oldClassLoader);
        }
    }
}