flink-examples | using Apache Flink framework to complement my blog Brewing | SQL Database library

by mushketyk Java Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | flink-examples Summary

flink-examples is a Java library typically used in Database, SQL Database applications. flink-examples has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub.

A repository of examples of using Apache Flink framework to complement my blog Brewing Codes.

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Quality

Security

License

Reuse

Support

flink-examples has a low active ecosystem.

It has 27 star(s) with 24 fork(s). There are 6 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 1 have been closed. On average issues are closed in 1 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of flink-examples is current.

Quality

flink-examples has 0 bugs and 0 code smells.

Security

flink-examples has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

flink-examples code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

flink-examples is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

flink-examples releases are not available. You will need to build from source code and install.

Build file is available. You can build the component from source.

flink-examples saves you 391 person hours of effort in developing the same functionality from scratch.

It has 930 lines of code, 52 functions and 14 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed flink-examples and discovered the below as its top functions. This is intended to give you an instant insight into flink-examples implemented functionality, and help decide if they suit your requirements.

Gets the next record in the buffer
Set the follower
Set the user number
Opens the reader for the given split
Gets the FileSystem
The path
Entry point for testing
Writes the text to a file
Main method for testing
Gets input splits
Main entry point
Entry point for testing
Entry point
Sets the ratings
Returns the graph statistics for the input path
Closes the reader

Get all kandi verified functions for this library.

flink-examples Key Features

No Key Features are available at this moment for flink-examples.

flink-examples Examples and Code Snippets

No Code Snippets are available at this moment for flink-examples.

Community Discussions

Trending Discussions on flink-examples

Numbers in output of Flink WordCount in IntelliJ

How does Flink countWindow work in detail

Computing variables before each iteration using the DataSet API in Apache Flink

Apache Flink example job fails to run with "Job not found"

Error while deploying Flink custom JAR file in AWS EMR

Flink: no suitable method found for process

Apache Flink: How to get timestamp of events in ingestion time mode?

Apache Flink: How can I read a DataStream/DataSet from Cassandra?

java.lang.ClassCastException: Netty fail on jar execution on Flink

class file for org.apache.flink.api.common.serialization.DeserializationSchema not found

QUESTION

Numbers in output of Flink WordCount in IntelliJ

Asked 2021-Jan-21 at 21:32

I am learning Apache Flink, and integrated it via Maven in IntelliJ. I tried this WordCount example from GitHub: WordCount example from GitHub

where I simply adjusted the input text.

The main part of the code producing the output is:

...

ANSWER

Answered 2021-Jan-21 at 07:46

WordCoiunt is the "hello world" in the streaming space.

NUMBER shows the number of repetitions
"florian" is twice in you input and shows up the first time with (florian,1) and the second occurs with (florian,2) if you add another "florian" to the input flink will count and show (florian,3)

Source https://stackoverflow.com/questions/65796104

QUESTION

How does Flink countWindow work in detail

Asked 2020-Sep-15 at 08:29

I'm learning Flink with simple toy examples.

I have adapted the WindowWordCount example from here and run it on this simple data file

...

ANSWER

Answered 2020-Sep-15 at 08:29

The Trigger for CountWindow only triggers the window function for complete windows -- in other words, after processing windowSize events for a given key, then the window will fire.

For example, with windowSize = 2, only for a and c are there enough events. Since there is only one b, the job ends with a partially filled window for b.

You can use a custom trigger that also reacts to a timeout if you want to generate reports for partial count windows.

Source https://stackoverflow.com/questions/63895423

QUESTION

Computing variables before each iteration using the DataSet API in Apache Flink

Asked 2020-Mar-03 at 08:50

I am working with the clustering example provided with Flink (Kmeans) and trying to extend the functionality of it. The goal is to reduce the number of distance computations by computing a multidimensional-array consisting of the distances between each centroid, such that the distances can be found in a double[][] array. This array must be computed at the beginning of each iteration and broadcasted, when the points are assigned clusters.

I have tried the following:

...

ANSWER

Answered 2020-Mar-03 at 08:50

DataSets are inherently unordered and sharded, both which are not suited for your use case.

What you want to do is to first collect all centroids in one method invocation.

Source https://stackoverflow.com/questions/60456001

QUESTION

Apache Flink example job fails to run with "Job not found"

Asked 2019-Aug-17 at 07:37

Attempting to run the SocketWindowWordCount example tutorial found on the flink site here.

I started the flink cluster, then ran a local socket server:

...

ANSWER

Answered 2019-Jul-10 at 10:14

This is usually happening when you have a Flink UI tab open in your browser, which is left open from previous job deployments. So the UI is pointing to a URL with http://.../f9b3c58ca3026855fd2612e3c86551fa which is a JobID that doesn't exist. This causes the above log to show up.

Source https://stackoverflow.com/questions/56961507

QUESTION

Error while deploying Flink custom JAR file in AWS EMR

Asked 2018-Oct-11 at 15:55

Basically I want to deploy a Flink custom JAR file to a new AWS EMR cluster. Here is a summary of what I did. I created a new AWS EMR cluster.

Step1:Software and steps changes -
- Created a AWS EMR cluster with flink as the service. (EMR release version - 5.17.0) and clicked Flink 1.5.2 as the software configuration.
- Entered the Configuration JSON:-
  
  [ { "Classification": "flink-conf", "Properties": { "jobmanager.heap.mb": "3072", "taskmanager.heap.mb": "51200", "taskmanager.numberOfTaskSlots":"2", "taskmanager.memory.preallocate": "false",
  "parallelism.default": "1" } ]
Step2:Hardware - No change in the hardware configuration.By default we have 1 master, 2 core and 0 Task instances. All are m3.xlarge type.
Step3:General Cluster Settings - No change here.
Step4:Security - Provided my EC2 key pair.

Once the cluster creation is ready I SSHed to the EC2 machine and tried to deploy the custom jar file. Below are the different errors I got everytime tried to deploy it via the CLI.

flink run -m yarn-cluster -yn 2 -c com.deepak.flink.examples.WordCount flink-examples-assembly-1.0.jar

...

ANSWER

Answered 2018-Oct-11 at 15:55

You should reduce memory allocation for task manager. Currently, you are trying to allocate 51.2G of memory whereas single m3.xlarge machine has only 15G of memory and in total 30G for 2 machines cluster.

Source https://stackoverflow.com/questions/52722213

QUESTION

Flink: no suitable method found for process

Asked 2018-Oct-02 at 09:18

I'm trying to apply per window functionality on Flink's DataStream. Following is my code

...

ANSWER

Answered 2018-Oct-02 at 09:18

The problem is that there's a mismatch between the KeySelector used in the keyBy and the key type specified in the ProcessWindowFunction. You have specified the key using an index into the Tuple2, and as a consequence, the compiler is unable to infer that the keys will be Strings. In this situation, Flink passes the key as a Tuple.

There are a couple of ways you can fix this. If you leave the keyBy as is, then you'll need to modify the ProcessWindowFunction to use Tuple as the key type, and you'll have to cast the key to a String if you want to use it. Something like ((Tuple1)key).f0. A better solution would be a use a more explicit key selector, such as keyBy(t -> t.f0), so that the keys are known to be Strings at compile time.

Source https://stackoverflow.com/questions/52598634

QUESTION

Apache Flink: How to get timestamp of events in ingestion time mode?

Asked 2018-Apr-16 at 22:00

I am wondering is it possible to obtain the timestamp of record by using Flink's ingestion time mode. Considering the following flink code example (https://github.com/apache/flink/blob/master/flink-examples/flink-examples-streaming/src/main/scala/org/apache/flink/streaming/scala/examples/join/WindowJoinSampleData.scala),

...

ANSWER

Answered 2018-Mar-05 at 15:15

Use ProcessFunction wich gives you a Context, that you can use to get the element's timestamp (whether its ingestion, processing or event time).

Source https://stackoverflow.com/questions/49107932

QUESTION

Apache Flink: How can I read a DataStream/DataSet from Cassandra?

Asked 2018-Apr-16 at 21:30

I tried to treat Cassandra as the source of data in Flink with the information provided in the following links:

I got the AsyncWaitOperator exception when I run the task. According the the first link, this exception occurs due to network problem. However, the strange thing is that I am running Cassandra on my local VM with only 10 rows of data in the target table.

@Jicaar in first link also mentions that switching from RichAsyncFunction to RichMapFunction can avoid the AsyncWaitOperator exception, can someone with similar experience share how to do it in RichMapFunction?

AsyncWaitOperator exception trace -->

...

ANSWER

Answered 2018-Apr-03 at 13:53

The below code should work for reading from Cassandra for batch processing in Flink.

Source https://stackoverflow.com/questions/49625265

QUESTION

java.lang.ClassCastException: Netty fail on jar execution on Flink

Asked 2018-Feb-14 at 11:28

I have a flink jar that sink a datastream of serializable datatype on elastic and cassandra with a beahaviour that differ from stand-alone context. I have read about netty conflict with Flink process and I excluded it from the pom file but it follow to be included in the package
Any suggestions?

This is the exception:

...

ANSWER

Answered 2018-Feb-14 at 11:28

I added the argument to the conf/flink.yaml and great, it works like a charm!!!! I lost hours checking the pom file with my collegues. :) Thankkkss

REF: https://docs.datastax.com/en/developer/java-driver-dse/1.4/faq/ https://ci.apache.org/projects/flink/flink-docs-release-1.2/setup/config.html#runtime-algorithms

Source https://stackoverflow.com/questions/48762857

QUESTION

class file for org.apache.flink.api.common.serialization.DeserializationSchema not found

Asked 2017-Dec-29 at 20:32

I'm trying to develop a flink stream job. The job should read from a kafka topic.

I've tried to update the example at https://github.com/dataArtisans/kafka-example/blob/master/src/main/java/com/dataartisans/ReadFromKafka.java

I want to use Flink 1.4 and Kafka 0.11.

When I try to build the (maven) project I get the following error:

...

ANSWER

Answered 2017-Dec-29 at 20:29

I think its because you are trying to use flink 1.3.0 according to your Pom.xml.

Source https://stackoverflow.com/questions/48028007

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install flink-examples

You can download it from GitHub.
You can use flink-examples like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the flink-examples component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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