distributed-system

问题 I want to run multiple worker daemons on single machine. As per damienfrancois's answer on what is the minimum number of computers for a slurm cluster it can be done. Problem is currently I am able to execute only 1 worker daemon on one machine. for example When I run sudo slurmd -N linux1 -cDvv sudo slurmd -N linux2 -cDvv linux1 goes down when I run linux2. Is it possible to run multiple worker daemons on one machine? Here is my slurm.conf file 回答1: as your intention seems to be just testing

问题 The distributed file systems which like Google File System and Hadoop doesn't support random I/O. (It can't modify the file which were written before. Only writing and appending is possible.) Why did they design file system like this? What are the important advantages of the design? P.S I know Hadoop will support modifing the data which were written. But they said, it's performance will very not good. Why? 回答1: Hadoop distributes and replicates files. Since the files are replicated, any write

问题 The distributed file systems which like Google File System and Hadoop doesn't support random I/O. (It can't modify the file which were written before. Only writing and appending is possible.) Why did they design file system like this? What are the important advantages of the design? P.S I know Hadoop will support modifing the data which were written. But they said, it's performance will very not good. Why? 回答1: Hadoop distributes and replicates files. Since the files are replicated, any write

问题 I tried to add slave in master machine. But when it adds it ask for password. That I didn't understand. Master = jhamb Slave = naveen, raja, gaurav Please solve below error. Looking for your kind response. Snapshot of console :- when I try to add any hosts it shows these lines 0successful HOST DTID ANY NAME NO SUCH HOST vim /etc/hosts shows :- # Do not remove the following line, or various programs # that require network functionality will fail. #127.0.0.1 localhost.localdomain localhost 10

问题 I am trying to use Hydra-CLI on a node.js local system, while connecting to a redis db that is hosted on redislabs. Howver, the redislabs db requires a password and I can't seem to find any configuration for password in the Hydra-CLI configuration options. I can connect to the database using hydra-express with a password set in the config.json hydra object. { "environment": "development", "hydra": { "serviceName": "hydraApp", "serviceIP": "", "servicePort": 3000, "serviceType": "sending back

问题 I would like to implement an distributed Point-Of-Sale system, somewhat like the one described in Point of sale app architecture advice. It is a distributed system with these charachteristics: The clients are mission critical , they should work even if the network connection or the server fails, but just for a few days or so. The clients must be easy to install. Each client has it's own local embedded database. The communication between the clients and the server is using a message queue. The

问题 I would like to know if my understanding of Message Bus and Message Queue workings is correct. First thing first, I need to clear the naming, a service bus is used interchangeably with message bus ? It is a publisher-subscriber type of system where messages are added let's say to a message collection by any number of publishers and from where any number of subscribers can read, am i right so far ? P1 --- /``````S1 \________ Service Bus Middleware ------+------ S2 / MESSAGE-COLLECTION \_____

问题 Background I have a system consisting of several distributed services, each of which is continuously generating events and reporting these to a central service. I need to present a unified timeline of the events, where the ordering in the timeline corresponds to the moment event occurred. The frequency of event occurrence and the network latency is such that I cannot simply use time of arrival at the central collector to order the events. E.g. in the following scenario: E1 needs to be

问题 I am picking up knowledge of consensus protocols in a distributed system. Such a distributed system does primary-backup on databases. I learned that "every consensus protocol can loop forever." from Leader election for paxos-based replicated key value store Where is the information source of "every consensus protocol can loop forever"? Status update: question answered. The same information source was provided by rystsov and another person of another post. Could more theoretical results and

问题 I'm reading gossip akka cluster documentation and still have one little misunderstanding about gossip. As said in this answer, two nodes are gossiping about the value and then who seen this value. But this comes with some issue about convergence. Here's how I see this: S - is a seen set. The issue is at some time, only node 4 knows that convergence happened. node 1, 2 and 3 still think it does not. I'm interesting about how should node 4 deal with convergence? Should it initiate a new gossip