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How to increase CPU Utilization in Linux (CPU Spike)
There are scenarios, Where we need to test or replicate an issue in the cluster, which requires a CPU spike…
Deleting Documents in Apache Solr manually
Multiple times, we need to remove the collection data manually, Like when it occupies a lot of space in the…
What is meant by “Tablet server is quiescing” in Apache Kudu
“Tablet server is quiescing” in a state When the Kudu Tablet server is down or not responding and the Kudu…
Resolve the “Memory limit exceeded” issue in IMPALA
“Memory limit exceeded” usually, happens When the query reached its max limit and is unable to allocate any more memory
Resolve “TTransportException: MaxMessageSize reached” Hive
Symptoms The “TTransportException: MaxMessageSize reached” exception will cause hive query failures when it tries to access a table that has…
Resolve “Slow BlockReceiver write packet to mirror”
“Slow BlockReceiver write packet to mirror” error usually indicates an unhealthy node in your Hadoop cluster or if the Node…
How to find and delete files older than X days in HDFS
find and delete files older than X days in HDFS
How to get the specific column from the command output in Linux
The awk command is used in Linux to get the value of the specific column from a command output or…
Solr TTL – Auto-Purging Solr Documents
In this blog, We will learn about Auto-Purging and the importance of TTL (Time-To-Live), and how to remove documents automatically…
How to Recover Standby Namenode (Bootstrap Standby Namenode)
– There are scenarios, Where we can’t able to bring back the standby Name node due to Disk crash, OS…
Kafka CLI Command Cheat Sheet
This article, Helps you to know the Kafka CLI Command used to create and list of topics and to start…
Resolve “Orphan region in HDFS: Unable to load .regioninfo from table” in Hbase
“Orphan region in HDFS: Unable to load .regioninfo from table” usually happens, When “.regioninfo” is unavailable under the HDFS table…
Resolve “org.apache.hadoop.hbase.TableInfoMissingException: No table descriptor file under” in Hbase
“org.apache.hadoop.hbase.TableInfoMissingException: No table descriptor file under” usually happens if the table descriptor file went missing (which is called an Orphan…
Resolve Region “found in META, but not in HDFS” issue in Hbase
When you are seeing the below ERROR messages in the logs then most probably there is a stale reference in…
How to stop an application in bash after a certain amount of time
Using a “timeout” command to stop an application or a command after a certain time limit is the best and…
Resolve “org.apache.hadoop.hbase.NotServingRegionException” in Apache Hbase
Symptom: The application fails while accessing the regions that are offline org.apache.hadoop.hbase.NotServingRegionException: org.apache.hadoop.hbase.NotServingRegionException: test:test,4:sample.703243:201310,1632342333102.3067sdfs84js51dd3e374aa1bfa2bea. is not online on <hostname>,16020,1632342333102 Cause:…
Resolve “Cannot modify at runtime. It is not in list of params that are allowed to be modified at runtime” in Hive
“Cannot modify at runtime. It is not in the list of params that are allowed to be modified at runtime”…
Resolve “application/x-www-form-urlencoded content length (X bytes) exceeds upload limit of 2048 KB” issue in Solr
“application/x-www-form-urlencoded content length (X bytes) exceeds upload limit of 2048 KB” error occurs when “formdataUploadLimit” reaches its max limit. This…
How to Add or Delete Replicas in Solr Collection
In this article, We will understand about Solr Search and How to add or delete a replica in the Solr…
Resolve “org.apache.hadoop.hive.ql.lockmgr.LockException(No record of transaction could be found)”
Symptom: Hive/Tez job fails with the below error messages Error while compiling statement: FAILED: Hive Internal Error: org.apache.hadoop.hive.ql.lockmgr.LockException(No record of…
Does Python have a Block Scope? (Scope in Python explained)
Python doesn’t have a block scope. If you come from a programming languages background like C, C++, or Java, In…
TypeError: a bytes-like object is required, not str error
TypeError: a bytes-like object is required, not str error occurs in Python when we try to use string where a…
How to Calculate the Average of Numbers in Python
In the day to activities of a programmer, Calculating the average for a set of numbers is one of the…
How to Find Factors of a Number in Python
In mathematics, factors play an important role in various operations such as finding prime numbers, calculating greatest common divisors, and…
FIX – Consider using the –user option
Consider using the –user option is one of the common issues that Python users face permission issues while installing Python…
Python Find in List – How to Find the Index of an Item in a List (with example)
To Find the Index of an Item in a List, We can use the index() function, Which takes a single…
Python Program to Print all Prime Numbers in an Interval
Printing all prime numbers in an interval is a common problem in mathematics. It involves finding all prime numbers within…
Defining and Calling a Function in Python
What is a function? It’s a block of statements that performs a specific task, which can be later reused any…
FizzBuzz Interview Question Python
FizzBuzz is one of the top Python interview questions asked to check, How the candidate arrives at the logic for…
Difference between List and String in Python
Python has several built-in data types to store and manipulate values. Two of the most commonly used data types in…
How to connect Apache Hive from Python
First of all, let’s start with some background information. Apache Hive is a data warehousing tool that allows you to…
Create Your First Python Game Rock, Paper, Scissors
What is Rock Paper Scissors and How to play it? Its a game played by 2 people with their hands,…
Generate random Words or Letters in Python
Have you ever needed to generate random words or letters in Python? Check out this article to learn different ways…
What is Randomization in Python – Explained with Coin Flip Example
What is Randomization? Randomization is to make something unpredictable and with no rules. But in real-time making a program unpredictable…
Python program to iterate through two lists in parallel
Have you ever needed to work with two lists of data in Python, and wanted to process them at the…
How custom classes are created in Python?
Custom classes in Python allow you to create your own data types with specific properties and behaviors. It will make…
How to Make a Tip Calculator in Python
Let’s Learn together: This blog helps to write Python code that will calculate tips for a restaurant bill and share…
How to read a file and write it to another file in python
Python has inbuilt functions to open, read, write a file and perform various activities around it Let’s learn about the functions and how…
How To Create A Brand Name Generator Using Python
Let’s Learn together: To create a simple brand name generator program using python, we need to be aware of the…
“IndexError: list index out of range” in Python
When working with lists in Python, you may come across an “IndexError: list index out of range” error message. “IndexError:…
Resolve “Job aborted due to stage failure” in Spark
When it comes to troubleshooting Spark issues. One thing you get used to it is knowing what the error exactly…
Resolve “Could not find CoarseGrainedScheduler” in Spark
In this article, we will understand and learn about the CoarseGrainedScheduler and why we are encountering this error in the…
FIX – TypeError: an integer is required (got type bytes)
In this article, we will learn about the “TypeError: an integer is required (got type bytes)” that occurs in PySpark…
How to Save DataFrame as a CSV File in Spark
Spark provides a lot of APIs to save DataFrame to multiple formats like CSV, Parquet, Hive tables, etc. In this…
How to Save Spark DataFrame directly to Hive
I hope you have encountered a similar situation, Where you wanted to do some manipulation on a spark dataframe and…
How to set Apache Spark Executor and Driver Memory/Cores ( pyspark and spark-submit)
In multiple cases, We need to increase the Driver/executors memory/cores to improve performance or to avoid Out of Memory issues
Spark Driver in Apache Spark and Where does the spark driver run?
Drivers are the one that starts the spark context or session in Spark, which helps in communicating with resource managers and runs tasks in
What are broadcast variables in Spark
Broadcast variables are commonly used by Spark developers to optimize their code for better performance. This article will provide a…
Resolve the “Container killed by YARN for exceeding memory limits” Issue in Hive, Tez, and Spark jobs
“Container killed by YARN for exceeding memory limits” usually happens, When the JVM usage goes beyond the Yarn container memory…
Why Spark/MR not considering UTF-8 encoding
Reading/WRITING UTF-8 enabled file Sometimes, we could have encountered issues in which Spark returns non-ASCII characters in the wrong format….
How to read and write Excel files with Spark
Apache Spark is a powerful data processing framework, Commonly, Spark is used to process data stored in various formats, including…
Difference between groupByKey and reduceByKey in Spark
groupByKey and reduceByKey are the two different operations that help to transform RDD (Resilient Distributed Datasets). What is the difference…
Understanding the Spark stack function for pivoting data
Hello! If you’re into big data processing, you’ve probably heard of Spark, right? It’s a popular distributed computing framework used…
How to Enable Kerberos Debugging for Spark Application and “hdfs dfs” Command
Kerberos debugging involves enabling debug log level for the Krb5LoginModule module at the JVM level, This would help us to…
Resolve “org.apache.hadoop.hive.serde2.SerDeException: Unexpected tag” in Spark and Hive
We usually see the ERROR “org.apache.hadoop.hive.serde2.SerDeException: Unexpected tag” in Spark, When you are trying to connect the hive…
Total size of serialized results of tasks (1024.5 MB) is bigger than spark.driver.maxResultSize
“failure: Total size of serialized results of x tasks (1024.5 MB) is bigger than spark.driver.maxResultSize (1024.0 MB)” in Spark
spark.driver.memoryOverhead and spark.executor.memoryOverhead explained
In this article, We will learn about memory overhead configuration in spark and explore more about spark.driver.memoryOverhead & spark.executor.memoryOverhead and…
“Futures timed out” issue in spark
“Futures timed out” is a common error that can occur when running Spark applications. In this article, We will learn,…
How to Kill Running Yarn Application ( Spark, Hive, and Tez)
One of the easiest ways to kill a Spark application is by issuing the “yarn kill” command
How to Access Kudu table from Spark
There are multiple use cases, Where we need to access Kudu from spark to store and retrieve data, In this…
How to Become Certified Kubernetes Administrator & Developer (CKA, CKAD)
Writing this article from my personal experience and hope it will help you to become a CKA & CKAD (Cheers) Before starting with the tips,…
Learn Kubernetes Deployments and how to record changes
There are two ways to create a deployment in Kubernetes – Imperative way – Declarative way This has been explained…
How to Format the Output of “kubectl” Command
By default, the output from the “kubectl” command will be easily readable by humans, But it can be further formatted based on our needs
How to Update the Image in Kubernetes Deployment
We can update the image of a Kubernetes deployment by simply running the “kubectl set image” command with the updated image
How to get the YAML file from Kubernetes objects (Pod, Deployment, Services, and combined)?
Using the “-o yaml ” option with the “kubectl get” command will get you the latest YAML file of currently deployed objects
Resolve “node has conditions: [DiskPressure]”
You might have faced the “DiskPressure” error messages in the Kubernetes cluster, Which results in pod/container eviction. In this article,…
How to list all running pod names in Kubernetes
list the pod name in Kubernetes
How to View Kubernetes Pod Logs (With Docker logging Examples)
Viewing Kubernetes pod logs is an essential task for debugging and troubleshooting issues with applications running in a Kubernetes cluster….
How to Create and Edit a pod in Kubernetes
We can create pods and other objects (like deployments, services, etc.) using the imperative or declarative method. Check here to…
How to Backup and Restore Kubernetes cluster manually
Kubernetes is a powerful tool for container orchestration, but like any complex system, it is susceptible to failures and data…
How to run a command inside a Kubernetes Container/Pod
Kubernetes is an open-source container orchestration platform that automates container deployment, scaling, and management. In Kubernetes, a pod is the…
Kubernetes: Use and where to find KubeConfig File
Use of Kubeconfig file: To access a Kubenetes cluster, we need to be aware about the Kube-API-Server and where it…
Authentication vs Authorization: What’s the Difference (Kubernetes)
Authentication: Let’s start this with different type of users, Who will be trying to access the cluster (We will use…
How to create a Dockerfile
— Dockerfile is a text file, Which is in a specific format Dockerfile [INSTRUCATION] [ARGUMENT] FROM python:3.6 <- Start from…
How to create our own Docker Image
-> Why would we need it in the 1st place, Because if you can’t find a command or service, which…
How can I keep a pod/container running on Kubernetes?
In general, containers are meant to exit on completion. Basically, Container will perform the task assigned to them and exit on completion (
What is Helm Chart in Kubernetes
What is Helm? Consider helm as a package + Release manager. Let’s talk about the current difficulty in deploying applications…
What’s the difference between ClusterIP, NodePort, and LoadBalancer service types in Kubernetes?
What are Kubernetes Services? A service is just another Kubernetes object just like a pod (Pod is the smallest unit…
Declarative vs Imperative way of creating Kubernetes objects
There are 2 ways to create an object in a Kubernetes cluster, either imperative or declarative. Let’s see a few…
Useful commands during Kubernetes certification (CKA,CKAD)
Know the shortcuts Kubernetes certification is basically a practical scanrios-based exam. Creating shortcuts would help you to save a lot…
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