How to use snapshot feature of MapR-FS to isolate Hive reads and writes

Goal:

As we know, Hive locks can be used to isolate reads and writes.
Please refer to my previous blogs for details:
http://www.openkb.info/2014/11/hive-locks-tablepartition-level.html
http://www.openkb.info/2018/07/hive-different-lock-behaviors-between.html

That lock mechanism is maintained by Hive and it could have performance overhead or unexpected lock behavior based on your application logic.
This article shows another way to use snapshot feature of MapR-FS to isolate Hive reads and writes.

"msck repair" of a partition table fails with error "Expecting only one partition but more than one partitions are found.".

Symptom:

In spark-shell, "msck repair" of a partition table named "database_name.table_name" fails with error "Expecting only one partition but more than one partitions are found.".

gcloud cheat sheet

This article records the common gcloud commands.
Please refer to the gcloud doc.

How to configure Drill to use cgroups to hard limit CPU resource in Redhat/CentOS 7

Goal:

This article explains how to configure Drill to use cgroups to hard limit CPU resource in Redhat/CentOS 7.

How to write an example MapR Drill JDBC code which connects to a MapR-Drill Cluster with MapRSASL authentication

Goal:

How to write an example MapR Drill JDBC code which connects to a MapR-Drill Cluster with MapRSASL authentication.
The reason why we are using Simba Drill JDBC Driver instead of open source JDBC Driver is:
The open-source JDBC driver is not tested on the MapR Converged Data Platform. The driver supports Kerberos and Plain authentication mechanisms, but does not support the MapR-SASL authentication mechanism. 

How to install MapR Data Fabric for Kubernetes(KDF) on Kubernetes Cluster

Goal:

This article explains the steps in details on how to install MapR Data Fabric for Kubernetes(KDF) on Kubernetes Cluster.

How to start Dashboard in a test Kubernetes Cluster

Goal:

How to start Dashboard in a test Kubernetes Cluster.
Dashboard is a web-based Kubernetes user interface. You can use Dashboard to deploy containerized applications to a Kubernetes cluster, troubleshoot your containerized application, and manage the cluster itself along with its attendant resources.

How to install a Kubernetes Cluster on CentOS 7

Goal:

How to install a Kubernetes Cluster on CentOS 7

Kubernetes Tutorial cheat sheet

This article records the commands for Kubernetes Tutorial online sessions:https://kubernetes.io/docs/tutorials/kubernetes-basics/

Minikube cheat sheet

This article records the command commands for Minikube from https://kubernetes.io/docs/tutorials/hello-minikube/