distributed

What algorithms there are for failover in a distributed system?

随声附和 提交于 2019-12-03 02:10:53
问题 I'm planning on making a distributed database system using a shared-nothing architecture and multiversion concurrency control. Redundancy will be achieved through asynchronous replication (it's allowed to lose some recent changes in case of a failure, as long as the data in the system remains consistent). For each database entry, one node has the master copy (only that node has write access to it), in addition to which one or more nodes have secondary copies of the entry for scalability and

Best Practice for synchronizing common distributed data

爷,独闯天下 提交于 2019-12-03 02:00:48
I have a internet application that supports offline mode where users might create data that will be synchronized with the server when the user comes back online. So because of this I'm using UUID's for identity in my database so the disconnected clients can generate new objects without fear of using an ID used by another client, etc. However, while this works great for objects that are owned by this user there are objects that are shared by multiple users. For example, tags used by a user might be global, and there's no possible way the remote database could hold all possible tags in the

Pass by reference problem in RMI?

狂风中的少年 提交于 2019-12-03 01:21:36
问题 can somebody please tell me where i m wrong why this RMI chat application not working,the goal is to achieve decoupleing between client, server and logic by remote objects or serialized objects. import javax.swing.*; import java.awt.event.*; import java.rmi.*; import java.rmi.server.*; public class ChatClient1 implements ICallback { JFrame frame = new JFrame("Chat Client"); private JTextArea myText; private static JTextArea TAUinDispMsg; private JScrollPane myTextScroll; private JScrollPane

Real World Use of Zookeeper [closed]

瘦欲@ 提交于 2019-12-03 00:02:35
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 years ago . This post is a Community Wiki . Edit existing answers to improve this post. It is not currently accepting new answers. I've been looking at Zookeeper recently and wondered whether anybody was using it currently and what they were specifically using it for storing. The most

Distributed Storage of BLOBs for .NET?

别说谁变了你拦得住时间么 提交于 2019-12-02 21:59:41
I am looking for a reasonably well tested library+server to store a persistent distributed hash table. I am hesistant to use SQL-based solutions as the data is highly document oriented, consisting of millions of ~64KB blobs with only a single index (computed by hash of said BLOB) - and needs to be able to be distributed for long term scaling prospects. Due to expense and bandwidth considerations, external solutions such as S3 are not an option. Something like CouchDB or Project Voldemort would be ideal - however there is a noticable lack of .NET bindings for both (PV can be IKVMC'd from Java -

How do you keep two related, but separate, systems in sync with each other?

半腔热情 提交于 2019-12-02 21:38:28
My current development project has two aspects to it. First, there is a public website where external users can submit and update information for various purposes. This information is then saved to a local SQL Server at the colo facility. The second aspect is an internal application which employees use to manage those same records (conceptually) and provide status updates, approvals, etc. This application is hosted within the corporate firewall with its own local SQL Server database. The two networks are connected by a hardware VPN solution, which is decent, but obviously not the speediest

Distributed development team - Tools Needed [closed]

最后都变了- 提交于 2019-12-02 21:28:20
Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. I have a team of developers distributed Globally over different time zones. what are the best tools to achieve maximum productivity in such a team? I am looking for: Source Control Bug Tracking Build Management Any other thing that may help Thanks When you say "open source" do you just mean free software, or do you mean "I need/prefer to be able to see the source"? Note that your decision will be influenced by the nature

Proposed solution: Generate unique IDs in a distributed environment

本小妞迷上赌 提交于 2019-12-02 20:46:29
I've been browsing the net trying to find a solution that will allow us to generate unique IDs in a regionally distributed environment. I looked at the following options (among others): SNOWFLAKE (by Twitter) It seems like a great solutions, but I just don't like the added complexity of having to manage another software just to create IDs; It lacks documentation at this stage, so I don't think it will be a good investment; The nodes need to be able to communicate to one another using Zookeeper (what about latency / communication failure?) UUID Just look at it: 550e8400-e29b-41d4-a716

JMeter - Loopback address error when launching jmeter-server on Linux

老子叫甜甜 提交于 2019-12-02 18:01:28
I'm trying to set up a distributed load testing environment using JMeter. I need to set up the remote clients using something portable like a Linux Live CD, but whenever I attempt to launch jmeter-server in Linux, I receive the following error... Created remote object: UnicastServerRef [liveRef: [endpoint:[127.0.0.1:49018](local),objID:[3b0d3d42:12985b7a49b:-7fff, -8459389540436649718]]] Server failed to start: java.rmi.RemoteException: Cannot start. testbox01.qa.nwr.lan is a loopback address. After extensive googling, the only remedy I can find is to edit the /etc/hosts file so the hostname

Jmeter Distributed Testing using Java Code

◇◆丶佛笑我妖孽 提交于 2019-12-02 16:38:09
问题 i am able to run Jmeter using Java Code, but if i want to do the same as Distributed Testing then how do i add the remote engines in the Java Code. 回答1: Here's a sample code to start a remote engine from Java code. Documentation about remote testing with JMeter And a sample to code a local test. 来源: https://stackoverflow.com/questions/36690957/jmeter-distributed-testing-using-java-code