On our cluster, we set up a dynamic resource pool.
Set the rules so that the first yarn will look at the specified queue, and then Check the username, then check the main group…
But u
Author: Simo
Hadoop – How to Create a Spark DataFrame from Sequencefile
I am using spark 1.5. I want to create a data frame from a file in HDFS. The HDFS file contains json data with a large number of fields in a sequence input file format.
Is there a way to do t
Hadoop cluster time synchronization
1. Cluster time synchronization
Find a machine, as a practical server, all machines will synchronize with the cluster time regularly, for example, synchronize the time every ten minutes.
1.1 Steps
YARN multi-tenant management
yarn multi-tenant configuration management (CapacityScheduler) hadoop version is 2.7
One: Before multi-tenant implementation, there is only one default queue
Second configuration file m
NHibernate Queryover on iUserType
First of all let me apologize for the length of this article, it is mainly code, so I hope you all bear with me!
I have a scenario dealing with a legacy database, I need to write an IUserType
Insert and query HBase speeds are slower
Surface problem: Inserting and querying HBase is slower
Check the HBase node status and find that it is running normally:
Check the status of accessing the HBase service and find that t
Jetty introduction Handler
Article reference
http://ipjmc.iteye.com/blog /1839999
http://blog.csdn.net/huangmin2050/article/details/7487922
Embedding a jetty service generally involves the following steps ,
Java client for Secure HBase
Hi, I am trying to write a java client for secure hbase.
I want to do kinit from the code itself, because I am using the user group information class.
Can anyone point out where I am wrong?
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Sleep – repeatable reading and second loss update problem
Using a repeatable read isolation level, updates may still be lost (the second lost update problem). For example. In the scenario where the isolation level is set to RR: 1) Transaction t1 reads da
Hibernate – Creating a JPA EntityMananger in Spring Context
I have a JPA/Spring application which uses Hibernate as the JPA provider. In part of the code, I have to manually create DAOs in my application using the new operator, Instead of using Spring DI. W