Hi, everybody. I met a problem:  one batch in spark streaming hangs allover, and other batchs run normally.
    
    Environment:

    spark-version: 2.0.0
    mode: yarn-cluster
    spark.executor.cores: 8
    spark.executor.memory: 12g
    spark.driver.memory: 3g

    I also check the driver/executors logs, don't find any usefull exceptions, and also do not find any useful solutions in website, can somebody expain to me why this batch hangs , or why not fails?