kryo Questions
3
Solved
While using Apache Flink with the following code:
DataStream<List<String>> result = source.window(Time.of(1, TimeUnit.SECONDS)).mapWindow(new WindowMapFunction<String, List<Strin...
Michaelson asked 8/9, 2015 at 8:38
2
Solved
I need to modify a class by adding two new parameters. This class is serialized with Kryo.
I'm currently persisting the information related to this class, among other things, as an RDD, every time ...
Silicosis asked 23/8, 2016 at 15:22
4
I am trying to run Spark (Java) code and getting the error
org.apache.spark.SparkException: Kryo serialization failed: Buffer overflow. Available: 0, required: 27".
Other posts have suggested se...
Harp asked 8/6, 2016 at 18:4
2
Solved
I am trying to register a class with array (Spark Java with Kryo activated), log shows a clear message:
Class is not registered: org.apache.spark.sql.execution.datasources.InMemoryFileIndex$Serial...
Symposiarch asked 9/1, 2019 at 9:1
4
Solved
I get a NullPointerException when I unserialize an ArrayList object using kryo.
Caused by: java.lang.NullPointerException
at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:215)
at jav...
0
There is a Scala Flink application where I am parsing JSON using Jackson library. Parsing is handled by a custom method and it uses the lazy initiation concept to keep it fast.
Now, for whatever re...
Transfiguration asked 21/1, 2021 at 12:3
2
Solved
The question is a follow-up of How to store custom objects in Dataset?
Spark version: 3.0.1
Non-nested custom type is achievable:
import spark.implicits._
import org.apache.spark.sql.{Encoder, Enco...
Ingroup asked 3/10, 2020 at 23:59
1
Solved
Say you have this (solution of encoding custom type is brought from this thread):
// assume we handle custom type
class MyObj(val i: Int, val j: String)
implicit val myObjEncoder = org.apache.spark...
Sammiesammons asked 3/10, 2020 at 12:41
6
Please help to understand how Kryo serializer allocates memory for its buffer.
My Spark app fails on a collect step when it tries to collect about 122Mb of data to a driver from workers.
com.esot...
Spagyric asked 11/8, 2015 at 16:37
1
I made a class Person and registered it but on runtime, it shows class not registered.Why is it showing so?
Exception in thread "main" org.apache.spark.SparkException: Job aborted due to stage fai...
Avestan asked 29/11, 2019 at 5:16
2
Solved
In spark, java serialization is the default, if kryo is that efficient then why it is not set as default. Is there some cons using kryo or in what scenarios we should use kryo or java serialization...
Radiotherapy asked 20/11, 2019 at 4:59
2
Solved
I am trying to fully utilize kryo serialization for spark. Setting
.set("spark.kryo.registrationRequired", "true")
This will let me know which classes need to be registered. I have registered ab...
Gullible asked 13/6, 2016 at 13:21
3
Solved
I have kryo serialization turned on with this:
conf.set( "spark.serializer", "org.apache.spark.serializer.KryoSerializer" )
I want to ensure that a custom class is serialized using kryo when shu...
Natiha asked 13/7, 2015 at 21:53
1
Solved
I am trying to understand the following error and I am running in client ode.
org.apache.spark.SparkException: Kryo serialization failed: Buffer overflow. Available: 0, required: 61186304. To avo...
Divvy asked 1/4, 2018 at 4:24
1
Solved
1-The Problem
I have a Spark program that make use of Kryo but not as part of the Spark Mechanics. More specifically I am using Spark Structured Streaming connected to Kafka.
I read binary val...
Percival asked 29/9, 2018 at 21:35
1
Is Kryo serialization still required when working with the Dataset API?
Because Datasets use Encoders for or serialization and deserialization:
Does Kyro serialization even work for Datasets? (P...
Braeunig asked 24/6, 2017 at 8:36
2
Solved
Kryo helps improve the performance of Spark applications by the efficient serialization approach.
I'm wondering, if Kryo will help in the case of SparkSQL, and how should I use it.
In SparkSQL appl...
Undine asked 14/3, 2018 at 6:15
0
I have a java class serialized using kryo-shaded 4.0.1
class definition :
class A{
private int c1;
private Map<Integer, String> c2;
}
After serialization when I deserialized its fine,Bu...
Deem asked 21/2, 2018 at 3:30
1
I am going to ask this question in the context of Spark, because that's what I'm facing, but this might be a plain Java issue.
In our spark job, we have a Resolver which needs to be used in all of...
Arterio asked 21/1, 2018 at 19:53
2
Solved
I try to submit a job on Flink 1.4 and getting the following exception.
Any idea how to solve the problem?
Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
...
Cannae asked 21/12, 2017 at 15:43
3
I use Kryo to write Objects into byte arrays. It works fine. But when the byte arrays are converted into the Objects, it throws, com.esotericsoftware.kryo.KryoException: Buffer underflow. exception...
Stalk asked 30/6, 2014 at 6:23
1
I have a graph-like object that I'm sending from server to client that contains nodes that have adjacencyLists.
I have something similar to this:
Clearing c1 = new Clearing(1, 134, 151);
Clearing...
Tamworth asked 21/2, 2015 at 0:28
1
Solved
I am using Kryo serialization in Spark (v1.6.1) in Java and while serializing a class which has a collection in its field, it throws the following error -
Caused by: java.lang.UnsupportedOperation...
Stoned asked 18/10, 2017 at 20:1
9
Solved
Kryo is a very new and interesting Java serialization library, and one of the fastest in the thrift-protobuf benchmark. If you've used Kryo, has it already reached enough maturity to try it out in ...
Cental asked 27/4, 2010 at 21:20
2
I enabled Kryo serialization for my Spark job, enabled the setting to require registration, and ensured all my types were registered.
val conf = new SparkConf()
conf.set("spark.serializer", "org.a...
Summary asked 9/1, 2017 at 17:5
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