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mike_bronson7
mike_bronson7
Gold ⭐️⭐️⭐️
June 27, 2019
Solved

Should zookeeper be run on independent machines? in production environment



we have HDP version 2.6.4 in our cluster

cluster include 285 data node machines and 3 kafka machines

for now zookeeper servers are installed on the masters machines and zookeepers are not independent machines

but since this is very important production cluster

we think to separate the zookeeper from the masters machines

and install the zookeeper servers on separate servers to be independent machines

am I right here?

jsensharma
jsensharmaAnswer
Platinum ⭐️⭐️
June 28, 2019

@Michael Bronson

Zookeeper is a light weight process hence it won't consume too much resource.

(EDIT😞 However there is the following recommendation from Hortonworks (For Kafka + Zookeeper) :

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.4/bk_kafka-component-guide/content/kafka-zookeeper-multiple-apps.html

Here are several recommendations for ZooKeeper configuration with Kafka:

  • Do not run ZooKeeper on a server where Kafka is running.

  • When using ZooKeeper with Kafka you should dedicate ZooKeeper to Kafka, and not use ZooKeeper for any other components.

  • Make sure you allocate sufficient JVM memory. A good starting point is 4GB.

  • To monitor the ZooKeeper instance, use JMX metrics.

.

As far as high availability is concerned for zookeepers then you can refer to the following HCC thread which talks about more on How to decide, how many zookeepers should I have?

https://community.hortonworks.com/questions/35287/how-to-decide-how-many-zookeepers-should-i-have.html


it depends on your requirement and then based on the requirement we can decide the number of ZK hosts as 3 or 5 (..etc). More ZK comes with a cost so please go through the above thread.


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14 replies

jsensharma
Platinum ⭐️⭐️
jsensharmaAnswer
Platinum ⭐️⭐️
June 28, 2019

@Michael Bronson

Zookeeper is a light weight process hence it won't consume too much resource.

(EDIT😞 However there is the following recommendation from Hortonworks (For Kafka + Zookeeper) :

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.4/bk_kafka-component-guide/content/kafka-zookeeper-multiple-apps.html

Here are several recommendations for ZooKeeper configuration with Kafka:

  • Do not run ZooKeeper on a server where Kafka is running.

  • When using ZooKeeper with Kafka you should dedicate ZooKeeper to Kafka, and not use ZooKeeper for any other components.

  • Make sure you allocate sufficient JVM memory. A good starting point is 4GB.

  • To monitor the ZooKeeper instance, use JMX metrics.

.

As far as high availability is concerned for zookeepers then you can refer to the following HCC thread which talks about more on How to decide, how many zookeepers should I have?

https://community.hortonworks.com/questions/35287/how-to-decide-how-many-zookeepers-should-i-have.html


it depends on your requirement and then based on the requirement we can decide the number of ZK hosts as 3 or 5 (..etc). More ZK comes with a cost so please go through the above thread.


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    mike_bronson7
    mike_bronson7Author
    Gold ⭐️⭐️⭐️
    June 28, 2019

    @dear jay - about - Make sure you allocate sufficient JVM memory. A good starting point is 4GB. , which parameter in ambari need to find in order to set the value to 4G?

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    Michael-Bronson
    jsensharma
    Platinum ⭐️⭐️
    jsensharma
    Platinum ⭐️⭐️
    June 28, 2019

    @Michael Bronson
    Zookeeper memory related settings can be specified inside the zookeeper-env script (via ambari zookeeper-env template)

    # grep 'SERVER_JVMFLAGS' /etc/zookeeper/3.1.0.0-78/0/zookeeper-env.sh
    export SERVER_JVMFLAGS=-Xmx4096m

    .

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    ask_bill_brooks
    Platinum ⭐️
    ask_bill_brooks
    Platinum ⭐️
    June 28, 2019

    @Michael Bronson originally posted the above in the Community Help track. On Fri Jun 28 07:12 UTC 2019, a member of the HCC moderation staff moved it and the entire reply thread below to the Design & Architecture track. The Community Help Track is intended for questions about using the HCC site itself, not technical questions about zookeeper servers or Kafka.

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    Bill Brooks, Community Moderator Was your question answered? Make sure to mark the answer as the accepted solution. If you find a reply useful, say thanks by clicking on the thumbs up button.
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