# Why node uuid replace by {bootstrap-placeholder}-{NodeName}

**URL:** <https://discuss.elastic.co/t/why-node-uuid-replace-by-bootstrap-placeholder-nodename/225869>\
**Category:** Elasticsearch\
**Created:** [March 31, 2020, 1:20pm UTC](https://discuss.elastic.co/t/why-node-uuid-replace-by-bootstrap-placeholder-nodename/225869 "2020-03-31T13:20:16Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [March 31, 2020, 3:14pm UTC](https://discuss.elastic.co/t/why-node-uuid-replace-by-bootstrap-placeholder-nodename/225869/2 "2020-03-31T15:14:06Z")

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> [@yc1024](#):
>
> 1. Why the uuid of master3 were replaced by {bootstrap-placeholder}-nameOfMaster3?

At the time the cluster bootstrapped, it did not know the ID of master 3 so it uses a placeholder that will be replaced with master 3's ID later. This is quite a low-level implementation detail that almost certainly isn't relevant to your problem

> [@yc1024](#):
>
> 1. Why master3 have a different cluster uuid ? is it brain-split?

You did not set `cluster.initial_master_nodes` to the same value on all three nodes, or you have changed it after the first time you started these nodes.

> [@yc1024](#):
>
> 1. Is there something wrong with my configuration?

Not obviously, but if you changed `cluster.initial_master_nodes` then that was wrong.

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