All Questions
Tagged with apache-zookeeper distributed-system
47
questions
0
votes
0
answers
19
views
Does zookeeper preserver order when moving sessions?
In the zookeeper book it says:
When a client creates a ZooKeeper handle using a specific language
binding, it establishes a session with the service. The client
initially connects to any server in ...
- 89
0
votes
2
answers
96
views
Doesn't Paxos end up with the same instructions in the exact same order?
I am trying to understand why ZAB is required when Paxos does the same thing. I read multiple documentations and articles and all summed up that Zookeeper requires the instructions to be in the exact ...
- 1,165
0
votes
1
answer
90
views
Legal Hierarchical Quorums in Zookeeper
I am trying to understand hierarchical quorums in Zookeeper. I may not understand the example shown in the documentation (here). Are votes [from at least two servers from each of two different groups] ...
- 13
1
vote
0
answers
54
views
Managing Configuration Across Many Instances of Applications
Disclaimer: I as well as my company are new to developing cloud applications / distributed systems, so this question might have an obvious solution that I'm not aware of.
Summary of Problem
We are ...
- 580
1
vote
1
answer
327
views
Confused about the consistency guarantee of zookeeper (Sequential vs Eventual Consistency)
As I understand, Zookeeper enforces "sequential consistency" which states any execution is the same as if all read/write ops were executed in some global ordering. Basically, a client may ...
- 105
0
votes
0
answers
481
views
Zookeeper (Curator framework) : explicitly giving up the leaderLatch
Background
I have a web-socket consumer running on 1 of my backend servers. To keep this system HA, i want to keep 2 more standby machines in the setup. Expectation is -> 1 of the standby VM ...
- 1,214
0
votes
1
answer
654
views
Why do we need to use Zookeeper for a Coordination Service instead of just a central database?
Quoting the zookeeper docs
ZooKeeper is a distributed, open-source coordination service for
distributed applications. It exposes a simple set of primitives that
distributed applications can build ...
- 197
0
votes
0
answers
86
views
Maintain status history leader or not leader using Apache Curator ( or any other way)
Background
Deployment system uses minimum 2 instances to deploy job. But only 1 is needed.
So planning to use Apache Curator for leader election. So only 1 instance will launch the job and other will ...
- 669
2
votes
2
answers
524
views
Consensus Service vs Lock Service?
Going through the Google's Chubby Paper,
Like a lock service, a consensus service would
allow clients to make progress safely even with only one
active client process; a similar technique has been ...
- 408
0
votes
1
answer
464
views
How do I manage that the different nodes in a distributed scheduler picks unique events?
I have a distributed job scheduler running on three machines which picks events from a database (elastic search).
The problem that I am facing is sometimes all the nodes pick the same events. That is ...
- 91
1
vote
0
answers
116
views
How does zookeeper internally achieve data consistency among leader and follower when leader fail
Apache Zookeeper documentation described steps about how to implement a distributed lock, steps are:
Call create() with the sequence and ephemeral flags set.
Call getChildren(), check if the data ...
- 990
4
votes
2
answers
5k
views
Do you need multiple zookeeper instances to run a multiple-broker kafka?
I'm new to kafka.
Kafka is supposed to be used as a distributed service. But the tutorials and blog posts i found online never mention if there is one or several zookeeper nodes.
The tutorials just ...
- 87
1
vote
1
answer
1k
views
Kafka Static IP and Service Discovery
I have a three node Kakfa cluster that also has a three node Zookeeper ensemble managing it. My configuration for this cluster looks like
Node 1
IP - 192.168.1.11
Kafka Port - 9092
Zookeeper Port - ...
- 555
1
vote
0
answers
1k
views
HBase installation in cluster - Master is initializing error
I am installing a multi node HBase cluster - 3 master and 3 region servers.
After installation, all the nodes are up and connected, the HBase UI, everything connected and all fine.
I am able to HBase ...
1
vote
1
answer
238
views
How to design a system that can manage configurations in a dynamic way efficiently?
I am working on designing a system where I need to manage configuration (config files) in a dynamic way across bunch of application servers. I am working with Consul key value store to manage ...
- 579