# Elastic 2.2.0 impact of adding nodes

**URL:** <https://discuss.elastic.co/t/elastic-2-2-0-impact-of-adding-nodes/102274>\
**Category:** Elasticsearch\
**Created:** [September 29, 2017, 2:58pm UTC](https://discuss.elastic.co/t/elastic-2-2-0-impact-of-adding-nodes/102274 "2017-09-29T14:58:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jeannot](https://avatars.discourse-cdn.com/v4/letter/j/ebca7d/32.png) [@jeannot](https://discuss.elastic.co/u/jeannot)\
**Post date:** [September 29, 2017, 2:58pm UTC](https://discuss.elastic.co/t/elastic-2-2-0-impact-of-adding-nodes/102274/1 "2017-09-29T14:58:57Z")

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Hi all,

We add 2 nodes on a heavy 3 nodes elastic cluster and I'm not clear on what happens after.  
Can someone explain me what the cluster is doing when new nodes arrive ?  
In fact the cluster seems to work for several hours ans only put 50Mb of data on the new nodes.

thanks

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [October 1, 2017, 10:09pm UTC](https://discuss.elastic.co/t/elastic-2-2-0-impact-of-adding-nodes/102274/2 "2017-10-01T22:09:13Z")

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It will move shards around to balance allocation.

> [@jeannot](#):
>
> In fact the cluster seems to work for several hours ans only put 50Mb of data on the new nodes.

How many indices and shards do you have?

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**Author:** ![jeannot](https://avatars.discourse-cdn.com/v4/letter/j/ebca7d/32.png) [@jeannot](https://discuss.elastic.co/u/jeannot)\
**Post date:** [October 3, 2017, 8:02am UTC](https://discuss.elastic.co/t/elastic-2-2-0-impact-of-adding-nodes/102274/3 "2017-10-03T08:02:36Z")

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shards: 488, indices: 78.  
the default of 5 shards and one replica is used on indices and we add 2 nodes (to have 5 nodes).  
At the moment, the cluster hangs for several hours (degrading performance) and did almost nothing.  
Can a shard be moved without interruption (I cannot stop the data flow)?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [October 31, 2017, 8:02am UTC](https://discuss.elastic.co/t/elastic-2-2-0-impact-of-adding-nodes/102274/4 "2017-10-31T08:02:53Z")

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