Re: Saving Kafka Offsets to Cassandra at begining of each batch in Spark Streaming

[Abhishek Anand]

Hi Cody,

I am able to do using this piece of code

kafkaStreamRdd.foreachRDD((rdd,batchMilliSec) -> {
Date currentBatchTime = new Date();
currentBatchTime.setTime(batchMilliSec.milliseconds());
List r = new ArrayList();
OffsetRange[] offsetRanges = ((HasOffsetRanges)rdd.rdd()).offsetRanges();
for(int partition = 0; partition < offsetRanges.length; partition++){
//Add offsets to the list
}
JavaSparkContext ctx = new JavaSparkContext(rdd.context());
JavaRDD currrentBatchOffsets = ctx.parallelize(r);
//write currrentBatchOffsets rdd to cassandra
return null;
});


Is this the correct way of doing this ?


Thanks !!
Abhi

On Tue, Feb 16, 2016 at 9:31 PM, Cody Koeninger  wrote:

> You could use sc.parallelize... but the offsets are already available at
> the driver, and they're a (hopefully) small enough amount of data that's
> it's probably more straightforward to just use the normal cassandra client
> to save them from the driver.
>
> On Tue, Feb 16, 2016 at 1:15 AM, Abhishek Anand 
> wrote:
>
>> I have a kafka rdd and I need to save the offsets to cassandra table at
>> the begining of each batch.
>>
>> Basically I need to write the offsets of the type Offsets below that I am
>> getting inside foreachRD, to cassandra. The javafunctions api to write to
>> cassandra needs a rdd. How can I create a rdd from offsets and write to
>> cassandra table.
>>
>>
>> public static void writeOffsets(JavaPairDStream> String> kafkastream){
>> kafkastream.foreachRDD((rdd,batchMilliSec) -> {
>> OffsetRange[] offsets = ((HasOffsetRanges) rdd.rdd()).offsetRanges();
>> return null;
>> });
>>
>>
>> Thanks !!
>> Abhi
>>
>>
>>
>

Re: Saving Kafka Offsets to Cassandra at begining of each batch in Spark Streaming

[Todd Nist]

You could use the "withSessionDo" of the SparkCassandrConnector to preform
the simple insert:

CassandraConnector(conf).withSessionDo { session => session.execute() }

-Todd

On Tue, Feb 16, 2016 at 11:01 AM, Cody Koeninger  wrote:

> You could use sc.parallelize... but the offsets are already available at
> the driver, and they're a (hopefully) small enough amount of data that's
> it's probably more straightforward to just use the normal cassandra client
> to save them from the driver.
>
> On Tue, Feb 16, 2016 at 1:15 AM, Abhishek Anand 
> wrote:
>
>> I have a kafka rdd and I need to save the offsets to cassandra table at
>> the begining of each batch.
>>
>> Basically I need to write the offsets of the type Offsets below that I am
>> getting inside foreachRD, to cassandra. The javafunctions api to write to
>> cassandra needs a rdd. How can I create a rdd from offsets and write to
>> cassandra table.
>>
>>
>> public static void writeOffsets(JavaPairDStream> String> kafkastream){
>> kafkastream.foreachRDD((rdd,batchMilliSec) -> {
>> OffsetRange[] offsets = ((HasOffsetRanges) rdd.rdd()).offsetRanges();
>> return null;
>> });
>>
>>
>> Thanks !!
>> Abhi
>>
>>
>>
>

Re: Saving Kafka Offsets to Cassandra at begining of each batch in Spark Streaming

[Cody Koeninger]

You could use sc.parallelize... but the offsets are already available at
the driver, and they're a (hopefully) small enough amount of data that's
it's probably more straightforward to just use the normal cassandra client
to save them from the driver.

On Tue, Feb 16, 2016 at 1:15 AM, Abhishek Anand 
wrote:

> I have a kafka rdd and I need to save the offsets to cassandra table at
> the begining of each batch.
>
> Basically I need to write the offsets of the type Offsets below that I am
> getting inside foreachRD, to cassandra. The javafunctions api to write to
> cassandra needs a rdd. How can I create a rdd from offsets and write to
> cassandra table.
>
>
> public static void writeOffsets(JavaPairDStream String> kafkastream){
> kafkastream.foreachRDD((rdd,batchMilliSec) -> {
> OffsetRange[] offsets = ((HasOffsetRanges) rdd.rdd()).offsetRanges();
> return null;
> });
>
>
> Thanks !!
> Abhi
>
>
>

Saving Kafka Offsets to Cassandra at begining of each batch in Spark Streaming

[Abhishek Anand]

I have a kafka rdd and I need to save the offsets to cassandra table at the
begining of each batch.

Basically I need to write the offsets of the type Offsets below that I am
getting inside foreachRD, to cassandra. The javafunctions api to write to
cassandra needs a rdd. How can I create a rdd from offsets and write to
cassandra table.


public static void writeOffsets(JavaPairDStream kafkastream){
kafkastream.foreachRDD((rdd,batchMilliSec) -> {
OffsetRange[] offsets = ((HasOffsetRanges) rdd.rdd()).offsetRanges();
return null;
});


Thanks !!
Abhi