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### Author:  [@jprante](https://discuss.elastic.co/u/jprante)
#### Post date: [February 2, 2015, 7:07pm UTC](https://discuss.elastic.co/t/java-client-node-creates-data-directory/21948/5 "2015-02-02T19:07:11Z")
Cluster state must be persisted, that is the reason why NodeClient needs to
write data to files.
It is a myth that TransportClient is slower because of two-hop. You will
not notice the difference in reality because the total time of an ES
operation takes usually longer than the extra hop. And, for the overhead of
managing cluster state, TransportClient does not need to care about that.
Jörg
On Mon, Feb 2, 2015 at 4:30 PM, Daniel Woo [daniel.y.woo@gmail.com](mailto:daniel.y.woo@gmail.com) wrote:
> Using a transport client would be slightly slower due to the two-hops,
> that's why I prefer a client node. I guess a pure client node just need
> some cluster info in memory, I don't see a reason why client need to save
> cluster info to disk.
> Now I have a interesting question, if I start multiple client nodes
> (multiple VMs with the same working directory), they will write to the same
> temporary data directory, will the data directory be messed up?
>
> On Monday, February 2, 2015 at 10:31:34 PM UTC+8, David Pilato wrote:
>
> > As it's a node, it's storing some cluster info in it.
> > You could use a Transport Client which will act as a pure Client without
> > joining the cluster.
> >
> > --
> > David 😉
> > Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs
> >
> > Le 2 févr. 2015 à 15:08, Daniel Woo [daniel...@gmail.com](mailto:daniel...@gmail.com) a écrit :
> >
> > Hi guys, I start a client node with the parameter "node.data" turned off,
> > why is the data directory automatically created in my working directory?
> > Can I avoid creating the "data" directory since it's a pure client node?
> >
> > --
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> > msgid/elasticsearch/37534520-ec4d-4076-b6c6-d6c65b2f9207%
> > [40googlegroups.com](http://40googlegroups.com)
> > [https://groups.google.com/d/msgid/elasticsearch/37534520-ec4d-4076-b6c6-d6c65b2f9207%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/37534520-ec4d-4076-b6c6-d6c65b2f9207%40googlegroups.com?utm_medium=email&utm_source=footer)
> > .
> > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
> >
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> > .
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### Author:  [@Daniel\_Woo](https://discuss.elastic.co/u/Daniel_Woo)
#### Post date: [February 3, 2015, 1:31am UTC](https://discuss.elastic.co/t/java-client-node-creates-data-directory/21948/6 "2015-02-03T01:31:29Z")
If only each nodes(VMs) use its own sub dir, that's fine. Thanks.
On Tue, Feb 3, 2015 at 12:00 AM, David Pilato [david@pilato.fr](mailto:david@pilato.fr) wrote:
> No each node will use its own subdir. This also applies to data nodes BTW.
>
> --
> _David Pilato_ | _Technical Advocate_ | _[Elasticsearch.com](http://Elasticsearch.com)
> [http://Elasticsearch.com](http://Elasticsearch.com)_
> @dadoonet [https://twitter.com/dadoonet](https://twitter.com/dadoonet) | @elasticsearchfr
> [https://twitter.com/elasticsearchfr](https://twitter.com/elasticsearchfr) | @scrutmydocs
> [https://twitter.com/scrutmydocs](https://twitter.com/scrutmydocs)
>
> Le 2 févr. 2015 à 16:30, Daniel Woo [daniel.y.woo@gmail.com](mailto:daniel.y.woo@gmail.com) a écrit :
>
> Using a transport client would be slightly slower due to the two-hops,
> that's why I prefer a client node. I guess a pure client node just need
> some cluster info in memory, I don't see a reason why client need to save
> cluster info to disk.
> Now I have a interesting question, if I start multiple client nodes
> (multiple VMs with the same working directory), they will write to the same
> temporary data directory, will the data directory be messed up?
>
> On Monday, February 2, 2015 at 10:31:34 PM UTC+8, David Pilato wrote:
>
> > As it's a node, it's storing some cluster info in it.
> > You could use a Transport Client which will act as a pure Client without
> > joining the cluster.
> >
> > --
> > David 😉
> > Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs
> >
> > Le 2 févr. 2015 à 15:08, Daniel Woo [daniel...@gmail.com](mailto:daniel...@gmail.com) a écrit :
> >
> > Hi guys, I start a client node with the parameter "node.data" turned off,
> > why is the data directory automatically created in my working directory?
> > Can I avoid creating the "data" directory since it's a pure client node?
> >
> > --
> > You received this message because you are subscribed to the Google Groups
> > "elasticsearch" group.
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> > msgid/elasticsearch/37534520-ec4d-4076-b6c6-d6c65b2f9207%
> > [40googlegroups.com](http://40googlegroups.com)
> > [https://groups.google.com/d/msgid/elasticsearch/37534520-ec4d-4076-b6c6-d6c65b2f9207%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/37534520-ec4d-4076-b6c6-d6c65b2f9207%40googlegroups.com?utm_medium=email&utm_source=footer)
> > .
> > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
>
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### Author:  [@Daniel\_Woo](https://discuss.elastic.co/u/Daniel_Woo)
#### Post date: [February 3, 2015, 1:42am UTC](https://discuss.elastic.co/t/java-client-node-creates-data-directory/21948/7 "2015-02-03T01:42:18Z")
Yes, I guess the extra hop is not a big deal compared to the disk IO ops on
the data node. I kind of prefer transport client now, the data directory
really drives me crazy 🙂
On Tue, Feb 3, 2015 at 3:07 AM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \<[joergprante@gmail.com](mailto:joergprante@gmail.com)
> wrote:
> Cluster state must be persisted, that is the reason why NodeClient needs
> to write data to files.
>
> It is a myth that TransportClient is slower because of two-hop. You will
> not notice the difference in reality because the total time of an ES
> operation takes usually longer than the extra hop. And, for the overhead of
> managing cluster state, TransportClient does not need to care about that.
>
> Jörg
>
> On Mon, Feb 2, 2015 at 4:30 PM, Daniel Woo [daniel.y.woo@gmail.com](mailto:daniel.y.woo@gmail.com) wrote:
>
> > Using a transport client would be slightly slower due to the two-hops,
> > that's why I prefer a client node. I guess a pure client node just need
> > some cluster info in memory, I don't see a reason why client need to save
> > cluster info to disk.
> > Now I have a interesting question, if I start multiple client nodes
> > (multiple VMs with the same working directory), they will write to the same
> > temporary data directory, will the data directory be messed up?
> >
> > On Monday, February 2, 2015 at 10:31:34 PM UTC+8, David Pilato wrote:
> >
> > > As it's a node, it's storing some cluster info in it.
> > > You could use a Transport Client which will act as a pure Client without
> > > joining the cluster.
> > >
> > > --
> > > David 😉
> > > Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs
> > >
> > > Le 2 févr. 2015 à 15:08, Daniel Woo [daniel...@gmail.com](mailto:daniel...@gmail.com) a écrit :
> > >
> > > Hi guys, I start a client node with the parameter "node.data" turned
> > > off, why is the data directory automatically created in my working
> > > directory? Can I avoid creating the "data" directory since it's a pure
> > > client node?
> > >
> > > --
> > > You received this message because you are subscribed to the Google
> > > Groups "elasticsearch" group.
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> > > msgid/elasticsearch/37534520-ec4d-4076-b6c6-d6c65b2f9207%
> > > [40googlegroups.com](http://40googlegroups.com)
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> > > .
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 12:35am UTC](https://discuss.elastic.co/t/java-client-node-creates-data-directory/21948/8 "2017-07-06T00:35:17Z")