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Questions tagged [master-slave]

A master/slave protocol involves one dominant participant (the master) controlling communication with one or more other participants (slaves). Prefer to tag the specific protocol, such as "i2c". For master/slave database replication, prefer "replication".

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Does mongodb master node need to be accessible from clients?

In a MongoDB replica set, Does master node need to be accessible from clients? Or secondary nodes will redirect write queries to master node?
Majid Azimi
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Execute load test with 0.1 million concurrent threads via JMeter

I'm a newbie to JMeter and I'm told to perform load test with 0.1 million concurrent threads via JMeter. Will each Server configuration of 16GB RAM,4 VCPU's be sufficient in master/slave configuration to handle the load. I tried with 1000 users…
speedy
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Is there a way to restrict writes to master only in redis?

I have a redis cluster created with master slave mode. I want to create a redisson client to access the cluster but I want to specify separate endpoints for reads and writes. Writes should go to master and reads should happen from the slaves. There…
Yellowjacket
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In SPI, How to count the frequency of the clock signal "sckl" from the master to the slave using VHDL?

I have created SPI master and slave modules and the connection is working fine but for verification purposes I would like to know how the slave could possibly determine the count of the output clock, sclk, that has been sent by the master. Thanks in…
Amr
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hadoop's start-dfs not creating datanode on the slave

I am trying to set a Hadoop cluster over two nodes. start-dfs.sh on my master node is opening a window and shortly after the window closes, and when i execute start-dfs it logs namenode is correctly launched, but datanode is not and logs the…
Patrick Schulz
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How to make an array to send the data to slave in AVR

I'm working on an AVR to learn it. my code is working properly. mean it gave me the output same as I want but I want to modify the code. I made 4 functions to send the data to the slave. like as it's in the code I want to send 61,62,63,64. but for…
Study only
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Can i create a Slave node on the same machine in which we have a Master node in Jenkins?

When i try to create a Slave node on my master node, that mean i want my master server to act as a slave node then i get lot of AccessDenied errors like remoting or logs folder. I am trying to create a Slave node in Jenkins so that i can run my…
nick
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MySQL master-slave replication connection failure

I'm trying to setup replication of a very simple database located on a MySQL8.0 installation on a computer running Scientific Linux release 6.10 (Carbon). The slave computer has Mysql 5.7.18 on a CentOS Linux release 7.8.2003 (Core). The slave…
user1621123
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Master-Slave replication is not working but status is ok

Did replication on the tutorial. SHOW SLAVE STATUS shows that everything is ok. Slave_IO_Running: Yes, Slave_SQL_Running: Yes, Last_Errno: 0, Slave_IO_State: Waiting for master to send event No errors will not fall, with any changes on the master,…
Владислав Ковалев
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Profibus with rpi master and slave

I am tasked with building profibus master and slave network using Rpi and Rs-485 convertor . One Rpi will be master and other will be slave. I am using https://github.com/mbuesch/pyprofibus for DP-stack to implement the same. How can I assign…
Zaks
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How to push code from gitlab to slave node using JENKINS

I have one master and multiple slave nodes, Master and nodes are the connection established. How can I push the code from gitlab to my slave nodes using Jenkins in master?
pbms
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If I cut a network cable and split a ReDiS cluster's masters from that cluster's ReDiS slaves, what do I do if the number of masters doubles?

More specifically, let us say that I trip on a network cable and split a ReDiS cluster's masters from that cluster's ReDiS slaves. If the number of masters doubles, can I just make my client only write to the "first" masters from before the…
Nathan Basanese
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Hadoop doesn't recognize the slave

I have the Hadoop installation on my local machine and on my slave node. I want to use it for the multinode cluster (master + 1 slave currently). I also read the hadoop multinode tutorial and try to run my hadoop on master and slave. I have the next…
Guforu
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MySql Slave, how to check if it is used

I've configured a master-slave replication and everything seems working properly and the slave is running with 0 seconds behind master. Now I want to remove the word "seems". I'd expect to have a gain in reads, but if I execute a heavy query on…
Riccardo Messineo
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MySQL replication fails with error

I've got two mysql servers and they are configured to act as master and slave for mysql replication. Things works fine till I execute following query against the master database. The query runs without any issues on master and the replication fails…
kuma DK
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