apache-zookeeper

问题 I am new to zookeeper.I have configured it in single machine.But I came across the words ensemble and quorum in the documentation of zookeeper.can anyone please tell me the difference between ensemble and quorum... Thanks.. 回答1: This answer is for those who still have doubt understanding Ensemble and Quorum . Ensemble is nothing but a cluster of Zookeeper servers, where in Quorum defines the rule to form a healthy Ensemble . Which is defined using a formula Q = 2N+1 where Q defines number of

问题 I was running some tests with table mappers and reducers on large scale problems. After a certain point my reducers started failing when the job was 80% done. From what I can tell when looking at the syslogs the problem is that one of my zookeepers is attempting to connect to the localhost as opposed to the other zookeepers in the quorum Oddly it seems to do just fine connecting to the other nodes when mapping is going on, its reducing that it has a problem with. Here are selected portions of

问题 In zookeeper, I can use zookeeper.exists(path,false) to check if the path exists. But if the path exists, witch method can I use to get the create mode of the path?(Persistent or Ephemeral) 回答1: On this call :zookeeper.exists(path,false) .. Zookeeper server will return you a Stat structure . From the Stat structure you check the property "ephemeralOwner" . this corresponds to session id of the owner of this znode if the znode is an ephemeral node. If it is not an ephemeral node, it will be

问题 when i run the zookeeper from the package in the kakfa_2.12-2.3.0 i am getting the following error $ export KAFKA_OPTS="-Djava.security.auth.login.config=/kafka/kafka_2.12-2.3.0/config/zookeeper_jaas.conf" $ ./bin/zookeeper-server-start.sh config/zookeeper.properties and the zookeeper_jaas.conf is KafkaServer { org.apache.kafka.common.security.plain.PlainLoginModule required username="admin" password="admin-secret" user_admin="admin-secret"; }; and the zookeeper.properties file is server

问题 I have written methods to retrieve data from zookeeper node without watcher. zookeeper.getData(nodePath, false, null); The above method call will return the data in the node. Now I want to fetch data from the node and later when an update occurs in the node, I want the updated data to be returned. This is the source to interact with zookeeper public class ZooKeeperOperations { public enum ZooKeeperResult { SUCCESS, NO_NODE_EXISTS, NODE_ALREADY_EXISTS, BAD_VERSION, CONNECTION_LOSS, NODE_NOT

问题 I have written methods to retrieve data from zookeeper node without watcher. zookeeper.getData(nodePath, false, null); The above method call will return the data in the node. Now I want to fetch data from the node and later when an update occurs in the node, I want the updated data to be returned. This is the source to interact with zookeeper public class ZooKeeperOperations { public enum ZooKeeperResult { SUCCESS, NO_NODE_EXISTS, NODE_ALREADY_EXISTS, BAD_VERSION, CONNECTION_LOSS, NODE_NOT

问题 I'm trying to setup a zookeeper and kafka as separate Kubernetes deployments/pods in a shared namespace. I've bootstraped a local K8s 1.8 with Calico via kubeadm on my Ubuntu sandbox... For the Zookeeper, I'm using the image zookeeper:3.4 from hub.docker.com and I created a Kubernetes deployment and service, where I expose ports: 2181 2888 3888. Service name is zookeeper and I assume I should be able to use it by this hostname from the pods in the namespace. For the Kafka 1.0, I've created my

问题 I'm trying to setup Apache Storm (1.0.2) on my Macbook Pro but apparently running into timeout issues if I try to deploy the topology. Also the UI hangs up spitting the same exception. 3491 [main] INFO o.a.s.StormSubmitter - Generated ZooKeeper secret payload for MD5-digest: -8915636774701640550:-6510752657961785886 3580 [main] INFO o.a.s.s.a.AuthUtils - Got AutoCreds [] Exception in thread "main" java.lang.RuntimeException: org.apache.storm.thrift.transport.TTransportException: java.net

问题 I am having issues trying to import this .so file in Python...I added this to my /etc/bashrc and source 'd it to make it reload...no luck so far... LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib The file DOES exist at /usr/local/lib/lobzookeeper_mt.so.2 File "build/bdist.linux-x86_64/egg/zookeeper.py", line 7, in <module> File "build/bdist.linux-x86_64/egg/zookeeper.py", line 6, in __bootstrap__ ImportError: libzookeeper_mt.so.2: cannot open shared object file: No such file or directory I

问题 The title may look like silly, but I really can't understand the zookeeper failover policy when the master is down although I read a lot of docs about Zookeeper. My question as following: If I have three nodes zookeeper, then the master is down, so how do the remaining two nodes elect the new master(right now it's an even number nodes, how do they vote by majority). If one of the remaining two nodes down, then the last one will become master and continually serve the service, right please? If