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I am having trouble with a zookeeper ensamble where one node is not able to join the quorum. Zookeeper will not join the cluster. How to apply patch/upgrade? This seems to be related to a bug which has been fixed in 3.4.6

Now the question is, how to upgrade within Ubuntu 14.04.3? I have already done apt-get update and apt-get upgrade and apt-get dist-upgrade, but the version still is Zookeeper version: 3.4.5--1, built on 06/10/2013 17:26 GMT

This is a production environment and it is important that the service stays live. Right now it is operational with 2 zookeeper nodes.

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The zookeeper service is a java process executing /usr/share/java/zookeeper.jar, which is a symlink to /usr/share/java/zookeeper-3.4.5.jar. I have downloaded the new version of zookeeper, stopped the service, copied the new jar to /usr/share/java/ and pointed the symlink to the new jar, then started the service:

sudo cp zookeeper-3.4.6.jar /usr/share/java/
sudo rm /usr/share/java/zookeeper.jar 
sudo ln -s /usr/share/java/zookeeper-3.4.6.jar /usr/share/java/zookeeper.jar
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