I try to get zookeeper stat from shell by using nc, call nc localhost 2181 first, then type in: stat works. while echo "stat" | nc localhost 2181 returns nothing. why?

Im new in hadoop and apache environment. Now I'm trying to learn about kafka I've installed hadoop via ambari. And i can see that there are some services installed. Including zookeeper . When i cli...

While I am trying to start zookeeper I am getting below error [2017-05-24 11:52:31,633] ERROR Last transaction was partial. (org.apache.zookeeper.server.persistence.Util) [2017-05-24 11:52:31,634]...

I am trying to set up a single zookeeper instance using the configuration below , however the start log indicates that the zookeeper is halting while trying to bind the port 2181.Can some one pleas...

I'm using kafka-python and I'm wondering if there is a way for showing all the topics. Something like this: ./bin/kafka-topics.sh --list --zookeeper localhost:2181

I'm learning how to use Kafka on this website link(except I'm using port 2182 in zookeeper), but it shows: zookeeper is not a recognized option after executing: sudo ./bin/kafka-console-consumer...

Zookeeper's rapidly pooping its internal binary files all over our production environment. According to: http://zookeeper.apache.org/doc/r3.3.3/zookeeperAdmin.html and http://dougchang333.blogspot....

I'm attempting to use Apache Curator with a dockerized zookeeper instance and no matter how I attempt to connect I always end up with a org.apache.zookeeper.KeeperException$UnimplementedExcepti...

how do I update a file with zkCli without any third party tools? I can't seem to find any examples anywhere. I can connect to the zookeeper instance, create/delete nodes and etc... but can't figure...

I just downloaded Kafka 2.8.0 from Apache website, and I am trying to setup using the instructions given on the website. But when I try to start zookeper server, I am getting below error: Error: C...

I’m learning Zookeeper and so far I don't understand the purpose of using it for distributed systems that databases can't solve. The use cases I’ve read are implementing a lock, barrier, etc for d...

I have a recent zookeeper build (version=3.4.3-1240972, built on 02/06/2012 10:48 GMT), and am having trouble forcing SASL to be used on all client connections. Using the local conf/ directory of ...

I want to create a topic in Kafka (kafka_2.8.0-0.8.1.1) through java. It is working fine if I create a topic in command prompt, and If I push message through java api. But I want to create a topic ...

I've generally implemented sequence number generation using database sequences in the past. e.g. Using Postgres SERIAL type http://www.neilconway.org/docs/sequences/ I'm curious though as how to ...

I'm working on a project using Zookeeper 3.4.6, and am performing some failure mode testing. While doing so, I found (what I think is) unexpected behaviour. Should followers restart if the leader ...

Let's say, I have P processes running some business logic on N physical machines. These processes call some web service S, say. I want to ensure that not more than X calls are made to the service S...

I am trying to understand ZooKeeper, how it works and what it does. Is there any application which is comparable to ZooKeeper? If you know, then how would you describe ZooKeeper to a layman? I h...

Dynamo-like databases (e.g. Cassandra) can enforce consistency by means of quorum, i.e. a number of synchronously written replicas (W) and a number of replicas to read (R) should be chosen in such ...

While reading the ZooKeeper's recipe for lock, I got confused. It seems that this recipe for distributed locks can not guarantee "any snapshot in time no two clients think they hold the same lock"....

What is the difference between Zookeeper and the load balancer ?

I have implemented a simulator (in Java) to show the performance of my protocol designed for distributed and peer-to-peer networks, in which transactions are processed via a consensus mechanism. Si...

When I pull the images from docker hub. Sometimes, I would like to run the images in a multi-container way. So I choose to use docker-compose. For example, I would run the zookeeper in replicated m...

I install a hadoop multi-node cluster on top of tow ubuntu virtual machines. In next step I trying to installing HBase on this virtual cluster. But when I running HBase with start-hbase.sh, HMaste...

I recently installed a new ZK node w/ Exhibitor, it started fine. When I do a telnet localhost 2181 and then run a stats to see the version, even though I installed 3.4.11, I keep seeing 3.4.5 buil...

Hi all I have setup multi node cluster (i.e 5 node) in my network which working fine. now I wanted to insert and retrieve data from cluster using hive thus I have setup hive latest release apache-h...