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From Dmitry Goldenberg <dgoldenberg...@gmail.com>
Subject Re: Batchdurationmillis seems "sticky" with direct Spark streaming
Date Tue, 08 Sep 2015 16:35:31 GMT
I just disabled checkpointing in our consumers and I can see that the batch
duration millis set to 20 seconds is now being honored.

Why would that be the case?

And how can we "untie" batch duration millis from checkpointing?

Thanks.

On Tue, Sep 8, 2015 at 11:48 AM, Cody Koeninger <cody@koeninger.org> wrote:

> Well, I'm not sure why you're checkpointing messages.
>
> I'd also put in some logging to see what values are actually being read
> out of your params object for the various settings.
>
>
> On Tue, Sep 8, 2015 at 10:24 AM, Dmitry Goldenberg <
> dgoldenberg123@gmail.com> wrote:
>
>> I've stopped the jobs, the workers, and the master. Deleted the contents
>> of the checkpointing dir. Then restarted master, workers, and consumers.
>>
>> I'm seeing the job in question still firing every 10 seconds.  I'm seeing
>> the 10 seconds in the Spark Jobs GUI page as well as our logs.  Seems quite
>> strange given that the jobs used to fire every 1 second, we've switched to
>> 10, now trying to switch to 20 and batch duration millis is not changing.
>>
>> Does anything stand out in the code perhaps?
>>
>> On Tue, Sep 8, 2015 at 9:53 AM, Cody Koeninger <cody@koeninger.org>
>> wrote:
>>
>>> Have you tried deleting or moving the contents of the checkpoint
>>> directory and restarting the job?
>>>
>>> On Fri, Sep 4, 2015 at 8:02 PM, Dmitry Goldenberg <
>>> dgoldenberg123@gmail.com> wrote:
>>>
>>>> Sorry, more relevant code below:
>>>>
>>>> SparkConf sparkConf = createSparkConf(appName, kahunaEnv);
>>>> JavaStreamingContext jssc = params.isCheckpointed() ?
>>>> createCheckpointedContext(sparkConf, params) : createContext(sparkConf,
>>>> params);
>>>> jssc.start();
>>>> jssc.awaitTermination();
>>>> jssc.close();
>>>> ……………………………..
>>>>   private JavaStreamingContext createCheckpointedContext(SparkConf
>>>> sparkConf, Parameters params) {
>>>>     JavaStreamingContextFactory factory = new
>>>> JavaStreamingContextFactory() {
>>>>       @Override
>>>>       public JavaStreamingContext create() {
>>>>         return createContext(sparkConf, params);
>>>>       }
>>>>     };
>>>>     return JavaStreamingContext.getOrCreate(params.getCheckpointDir(),
>>>> factory);
>>>>   }
>>>>
>>>>   private JavaStreamingContext createContext(SparkConf sparkConf,
>>>> Parameters params) {
>>>>     // Create context with the specified batch interval, in
>>>> milliseconds.
>>>>     JavaStreamingContext jssc = new JavaStreamingContext(sparkConf,
>>>> Durations.milliseconds(params.getBatchDurationMillis()));
>>>>     // Set the checkpoint directory, if we're checkpointing
>>>>     if (params.isCheckpointed()) {
>>>>       jssc.checkpoint(params.getCheckpointDir());
>>>>     }
>>>>
>>>>     Set<String> topicsSet = new HashSet<String>(Arrays.asList(params
>>>> .getTopic()));
>>>>
>>>>     // Set the Kafka parameters.
>>>>     Map<String, String> kafkaParams = new HashMap<String, String>();
>>>>     kafkaParams.put(KafkaProducerProperties.METADATA_BROKER_LIST,
>>>> params.getBrokerList());
>>>>     if (StringUtils.isNotBlank(params.getAutoOffsetReset())) {
>>>>       kafkaParams.put(KafkaConsumerProperties.AUTO_OFFSET_RESET, params
>>>> .getAutoOffsetReset());
>>>>     }
>>>>
>>>>     // Create direct Kafka stream with the brokers and the topic.
>>>>     JavaPairInputDStream<String, String> messages =
>>>> KafkaUtils.createDirectStream(
>>>>       jssc,
>>>>       String.class,
>>>>       String.class,
>>>>       StringDecoder.class,
>>>>       StringDecoder.class,
>>>>       kafkaParams,
>>>>       topicsSet);
>>>>
>>>>     // See if there's an override of the default checkpoint duration.
>>>>     if (params.isCheckpointed() && params.getCheckpointMillis() >
0L) {
>>>>       messages.checkpoint(Durations.milliseconds(params
>>>> .getCheckpointMillis()));
>>>>     }
>>>>
>>>>     JavaDStream<String> messageBodies = messages.map(new
>>>> Function<Tuple2<String, String>, String>() {
>>>>       @Override
>>>>       public String call(Tuple2<String, String> tuple2) {
>>>>         return tuple2._2();
>>>>       }
>>>>     });
>>>>
>>>>     messageBodies.foreachRDD(new Function<JavaRDD<String>, Void>()
{
>>>>       @Override
>>>>       public Void call(JavaRDD<String> rdd) throws Exception {
>>>>         ProcessPartitionFunction func = new
>>>> ProcessPartitionFunction(params);
>>>>         rdd.foreachPartition(func);
>>>>         return null;
>>>>       }
>>>>     });
>>>>
>>>>     return jssc;
>>>> }
>>>>
>>>> On Fri, Sep 4, 2015 at 8:57 PM, Dmitry Goldenberg <
>>>> dgoldenberg123@gmail.com> wrote:
>>>>
>>>>> I'd think that we wouldn't be "accidentally recovering from
>>>>> checkpoint" hours or even days after consumers have been restarted, plus
>>>>> the content is the fresh content that I'm feeding, not some content that
>>>>> had been fed before the last restart.
>>>>>
>>>>> The code is basically as follows:
>>>>>
>>>>>     SparkConf sparkConf = createSparkConf(...);
>>>>>     // We'd be 'checkpointed' because we specify a checkpoint
>>>>> directory which makes isCheckpointed true
>>>>>     JavaStreamingContext jssc = params.isCheckpointed() ?
>>>>> createCheckpointedContext(sparkConf, params) : createContext(sparkConf,
>>>>> params);    jssc.start();
>>>>>
>>>>>     jssc.awaitTermination();
>>>>>
>>>>>     jssc.close();
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Sep 4, 2015 at 8:48 PM, Tathagata Das <tdas@databricks.com>
>>>>> wrote:
>>>>>
>>>>>> Are you sure you are not accidentally recovering from checkpoint?
How
>>>>>> are you using StreamingContext.getOrCreate() in your code?
>>>>>>
>>>>>> TD
>>>>>>
>>>>>> On Fri, Sep 4, 2015 at 4:53 PM, Dmitry Goldenberg <
>>>>>> dgoldenberg123@gmail.com> wrote:
>>>>>>
>>>>>>> Tathagata,
>>>>>>>
>>>>>>> In our logs I see the batch duration millis being set first to
10
>>>>>>> then to 20 seconds. I don't see the 20 being reflected later
during
>>>>>>> ingestion.
>>>>>>>
>>>>>>> In the Spark UI under Streaming I see the below output, notice
the *10
>>>>>>> second* Batch interval.  Can you think of a reason why it's stuck
>>>>>>> at 10?  It used to be 1 second by the way, then somehow over
the course of
>>>>>>> a few restarts we managed to get it to be 10 seconds.  Now it
won't get
>>>>>>> reset to 20 seconds.  Any ideas?
>>>>>>>
>>>>>>> Streaming
>>>>>>>
>>>>>>>    - *Started at: *Thu Sep 03 10:59:03 EDT 2015
>>>>>>>    - *Time since start: *1 day 8 hours 44 minutes
>>>>>>>    - *Network receivers: *0
>>>>>>>    - *Batch interval: *10 seconds
>>>>>>>    - *Processed batches: *11790
>>>>>>>    - *Waiting batches: *0
>>>>>>>    - *Received records: *0
>>>>>>>    - *Processed records: *0
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Statistics over last 100 processed batchesReceiver Statistics
>>>>>>> No receivers
>>>>>>> Batch Processing Statistics
>>>>>>>
>>>>>>>    MetricLast batchMinimum25th percentileMedian75th percentile
>>>>>>>    MaximumProcessing Time23 ms7 ms10 ms11 ms14 ms172 msScheduling
>>>>>>>    Delay1 ms0 ms0 ms0 ms1 ms2 msTotal Delay24 ms8 ms10 ms12 ms14
ms173
>>>>>>>    ms
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Sep 4, 2015 at 3:50 PM, Tathagata Das <tdas@databricks.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Could you see what the streaming tab in the Spark UI says?
It
>>>>>>>> should show the underlying batch duration of the StreamingContext,
the
>>>>>>>> details of when the batch starts, etc.
>>>>>>>>
>>>>>>>> BTW, it seems that the 5.6 or 6.8 seconds delay is present
only
>>>>>>>> when data is present (that is, * Documents processed: >
0)*
>>>>>>>>
>>>>>>>> On Fri, Sep 4, 2015 at 3:38 AM, Dmitry Goldenberg <
>>>>>>>> dgoldenberg123@gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Tathagata,
>>>>>>>>>
>>>>>>>>> Checkpointing is turned on but we were not recovering.
I'm looking
>>>>>>>>> at the logs now, feeding fresh content hours after the
restart. Here's a
>>>>>>>>> snippet:
>>>>>>>>>
>>>>>>>>> 2015-09-04 06:11:20,013 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:11:30,014 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:11:40,011 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:11:50,012 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:12:00,010 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:12:10,047 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:12:20,012 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:12:30,011 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:12:40,012 ... Documents processed: 0.
>>>>>>>>> *2015-09-04 06:12:55,629 ... Documents processed: 4.*
>>>>>>>>> 2015-09-04 06:13:00,018 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:13:10,012 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:13:20,019 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:13:30,014 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:13:40,041 ... Documents processed: 0.
>>>>>>>>> 2015-09-04 06:13:50,009 ... Documents processed: 0.
>>>>>>>>> ...
>>>>>>>>> 2015-09-04 06:17:30,019 ... Documents processed: 0.
>>>>>>>>> *2015-09-04 06:17:46,832 ... Documents processed: 40.*
>>>>>>>>>
>>>>>>>>> Interestingly, the fresh content (4 documents) is fed
about 5.6
>>>>>>>>> seconds after the previous batch, not 10 seconds. The
second fresh batch
>>>>>>>>> comes in 6.8 seconds after the previous empty one.
>>>>>>>>>
>>>>>>>>> Granted, the log message is printed after iterating over
the
>>>>>>>>> messages which may account for some time differences.
But generally,
>>>>>>>>> looking at the log messages being printed before we iterate,
it's still 10
>>>>>>>>> seconds each time, not 20 which is what batchdurationmillis
is currently
>>>>>>>>> set to.
>>>>>>>>>
>>>>>>>>> Code:
>>>>>>>>>
>>>>>>>>> JavaPairInputDStream<String, String> messages =
>>>>>>>>> KafkaUtils.createDirectStream(....);
>>>>>>>>> messages.checkpoint(Durations.milliseconds(checkpointMillis));
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>   JavaDStream<String> messageBodies = messages.map(new
Function<Tuple2<String,
>>>>>>>>> String>, String>() {
>>>>>>>>>       @Override
>>>>>>>>>       public String call(Tuple2<String, String>
tuple2) {
>>>>>>>>>         return tuple2._2();
>>>>>>>>>       }
>>>>>>>>>     });
>>>>>>>>>
>>>>>>>>>     messageBodies.foreachRDD(new Function<JavaRDD<String>,
Void>()
>>>>>>>>> {
>>>>>>>>>       @Override
>>>>>>>>>       public Void call(JavaRDD<String> rdd) throws
Exception {
>>>>>>>>>
>>>>>>>>>   ProcessPartitionFunction func = new ProcessPartitionFunction(...);
>>>>>>>>>         rdd.foreachPartition(func);
>>>>>>>>>         return null;
>>>>>>>>>       }
>>>>>>>>>     });
>>>>>>>>>
>>>>>>>>> The log message comes from ProcessPartitionFunction:
>>>>>>>>>
>>>>>>>>> public void call(Iterator<String> messageIterator)
throws Exception
>>>>>>>>> {
>>>>>>>>>     log.info("Starting data partition processing. AppName={},
>>>>>>>>> topic={}.)...", appName, topic);
>>>>>>>>>     // ... iterate ...
>>>>>>>>>     log.info("Finished data partition processing (appName={},
>>>>>>>>> topic={}). Documents processed: {}.", appName, topic,
docCount);
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> Any ideas? Thanks.
>>>>>>>>>
>>>>>>>>> - Dmitry
>>>>>>>>>
>>>>>>>>> On Thu, Sep 3, 2015 at 10:45 PM, Tathagata Das <
>>>>>>>>> tdas@databricks.com> wrote:
>>>>>>>>>
>>>>>>>>>> Are you accidentally recovering from checkpoint files
which has
>>>>>>>>>> 10 second as the batch interval?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Thu, Sep 3, 2015 at 7:34 AM, Dmitry Goldenberg
<
>>>>>>>>>> dgoldenberg123@gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>>> I'm seeing an oddity where I initially set the
>>>>>>>>>>> batchdurationmillis to 1 second and it works
fine:
>>>>>>>>>>>
>>>>>>>>>>> JavaStreamingContext jssc = new JavaStreamingContext(sparkConf,
>>>>>>>>>>> Durations.milliseconds(batchDurationMillis));
>>>>>>>>>>>
>>>>>>>>>>> Then I tried changing the value to 10 seconds.
The change didn't
>>>>>>>>>>> seem to take. I've bounced the Spark workers
and the consumers and now I'm
>>>>>>>>>>> seeing RDD's coming in once around 10 seconds
(not always 10 seconds
>>>>>>>>>>> according to the logs).
>>>>>>>>>>>
>>>>>>>>>>> However, now I'm trying to change the value to
20 seconds and
>>>>>>>>>>> it's just not taking. I've bounced Spark master,
workers, and consumers and
>>>>>>>>>>> the value seems "stuck" at 10 seconds.
>>>>>>>>>>>
>>>>>>>>>>> Any ideas? We're running Spark 1.3.0 built for
Hadoop 2.4.
>>>>>>>>>>>
>>>>>>>>>>> Thanks.
>>>>>>>>>>>
>>>>>>>>>>> - Dmitry
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>

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