apache-zookeeper

I have a Cassandra cluster and Zookeeper server installed. Now I want to support transactions in cassandra using zookeeper. How do i do that. Zookeeper creates znodes to perform read and write operations and data to and fro goes through znodes in Zookeeper. I want to know that how to support rollback and commit feature in cassandra using Zookeeper. Is there any way by which we can specify cassandra configurations in zookeeper or zookeeper configurations in cassandra. I know cassandra and zookeeper individually how data is read and written but I dont know how to integrate both of them using

What exactly is the zookeeper quorum setting in hbase-site.xml? As described in hbase-default.xml, here's the setting: Comma separated list of servers in the ZooKeeper Quorum. For example, "host1.mydomain.com,host2.mydomain.com,host3.mydomain.com". By default this is set to localhost for local and pseudo-distributed modes of operation. For a fully-distributed setup, this should be set to a full list of ZooKeeper quorum servers. If HBASE_MANAGES_ZK is set in hbase-env.sh this is the list of servers which we will start/stop ZooKeeper on. What this actually does has been answered by Edward J.

I have a network with some weird (as I understand) DNS server which causes Hadoop or HBase to malfunction. It resolves my hostname to some address my machine doesn't know about (i.e. there is no such interface). Hadoop does work if I have following entries in /etc/hosts: 127.0.0.1 localhost 127.0.1.1 myhostname If entry "127.0.1.1 myhostname" is not present uploading file to HDFS fails and complains that it can replicate the file only to 0 datanodes instead of 1. But in this case HBase does not work: creating a table from HBase shell causes NotAllMetaRegionsOnlineException (caused actually by

I am new to Kafka and trying to create a new topic on my local machine. I am following this link . Here are the steps which i followed: Start zookeeper bin/zookeeper-server-start.sh config/zookeeper.properties Start kafka-server bin/kafka-server-start.sh config/server.properties Create a topic bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic test but when creating the topic, i am getting the following error: Exception in thread "main" joptsimple.UnrecognizedOptionException: bootstrap-server is not a recognized option at joptsimple

I'm planning to use Spring Boot for my assignment. Its a typical server application with connection to database. I know I can use Spring Configuration to externalize my properties e.g. db connection details. But I also have other dynamic properties which needs be updated at runtime. e.g. flippers/feature flags. Certain features of my application needs to be controlled dynamically e.g. imagine a property like app.cool-feature.enable=true and then after a while the same feature would be turned off by app.cool-feature.enable=false Any suggestions what is the best practice around ingesting such

I am trying to read messages on Kafka topic, but I am unable to read it. The process gets killed after sometime, without reading any messages. Here is the rebalancing error which I get: [2014-03-21 10:10:53,215] ERROR Error processing message, stopping consumer: (kafka.consumer.ConsoleConsumer$) kafka.common.ConsumerRebalanceFailedException: topic-1395414642817-47bb4df2 can't rebalance after 4 retries at kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.syncedRebalance(ZookeeperConsumerConnector.scala:428) at kafka.consumer.ZookeeperConsumerConnector.kafka$consumer