# Separate data and metadata
**URL:** https://discuss.elastic.co/t/separate-data-and-metadata/248531
**Category:** Elasticsearch
**Created:** [September 14, 2020, 1:20pm UTC](https://discuss.elastic.co/t/separate-data-and-metadata/248531 "2020-09-14T13:20:09Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Oleg\_Ruchovets](https://discuss.elastic.co/u/Oleg_Ruchovets)
#### Post date: [September 14, 2020, 1:20pm UTC](https://discuss.elastic.co/t/separate-data-and-metadata/248531/1 "2020-09-14T13:20:09Z")
Hello.
In Hadoop echo system and some other solution: data and metadata are stored separately. For Hadoop, there are master nodes to store metadata.
Question: does Elasticsearch have similar architecture? I mean is there metadata and data separation or ES hold data and metadata as part of the same JSON document?
Thanks.
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### Author:  [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)
#### Post date: [September 14, 2020, 1:52pm UTC](https://discuss.elastic.co/t/separate-data-and-metadata/248531/2 "2020-09-14T13:52:56Z")
In Elasticsearch the master-eligible nodes are responsible for the cluster metadata, whereas the data nodes are responsible for the data. A single node can do both roles, or you can separate them. See [these docs](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html#node-roles) for more information.
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### Author:  [@Oleg\_Ruchovets](https://discuss.elastic.co/u/Oleg_Ruchovets)
#### Post date: [September 14, 2020, 2:16pm UTC](https://discuss.elastic.co/t/separate-data-and-metadata/248531/3 "2020-09-14T14:16:50Z")
Ok, Thank @DavidTurner for the quick answer.
Is it a best practice to separate the master node from data nodes?
In case of a master crashed elastic will elect a new master, right? what will be in this case with metadata? Should master machine configuration be more memory / CPU / disk intensive comparing to the data node?
Thanks
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [September 14, 2020, 10:17pm UTC](https://discuss.elastic.co/t/separate-data-and-metadata/248531/4 "2020-09-14T22:17:02Z")
> [@Oleg\_Ruchovets](#):
>
> Is it a best practice to separate the master node from data nodes?
Yes.
> [@Oleg\_Ruchovets](#):
>
> In case of a master crashed elastic will elect a new master, right? what will be in this case with metadata?
Yes. All nodes in the cluster hold the cluster state.
> [@Oleg\_Ruchovets](#):
>
> Should master machine configuration be more memory / CPU / disk intensive comparing to the data node?
No, you might even be able to go with less.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [October 12, 2020, 10:17pm UTC](https://discuss.elastic.co/t/separate-data-and-metadata/248531/5 "2020-10-12T22:17:08Z")
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