# If I set index.number\_of\_replica:1, then the minimum number of nodes should be 3 to assure that the status of the cluster is gree?
**URL:** https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944
**Category:** Elasticsearch
**Created:** [June 6, 2014, 3:41am UTC](https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944 "2014-06-06T03:41:08Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@flyer](https://discuss.elastic.co/u/flyer)
#### Post date: [June 6, 2014, 3:41am UTC](https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944/1 "2014-06-06T03:41:08Z")
I have a cluster of two nodes, and set the configs for shard number and
replica number as following:
index.number\_of\_shards: 10
index.number\_of\_replicas: 1
The master node is elected automatically.
Before I index data, the state of the cluster is green. After I index data,
the state of the cluster becomes yellow. Some replica shards are not
allocated.
But if I add another node and now the cluster consists of three nodes, then
I index data and the state of the cluster becomes green.
The version of ES that I use is 1.1.
Question 1:
If the replica number is 1, do I have to have at least 3 nodes to
assure the state of the cluster is green?
Question 2:
I have observed that one (not the master node) of the three nodes just
has primary nodes. What's the mechanism ES uses to allocate primary/replia
shards?
Thanks anyway.
--
宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
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### Author:  [@jprante](https://discuss.elastic.co/u/jprante)
#### Post date: [June 6, 2014, 7:05am UTC](https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944/2 "2014-06-06T07:05:26Z")
1. No. Did you change the configuration? You have two data nodes connected?
2. You do not need to be concerned where primary shards are allocated,
secondary shards play the same role (except primaries receive writes first
a few milliseconds earlier than secondaries). Elasticsearch randomly
allocates shards on all the available nodes. If nodes go away, shards on
remaining nodes are promoted to primaries automatically.
Jörg
On Fri, Jun 6, 2014 at 5:41 AM, flyer [flyer103@gmail.com](mailto:flyer103@gmail.com) wrote:
> I have a cluster of two nodes, and set the configs for shard number and
> replica number as following:
>
> index.number\_of\_shards: 10
>
> index.number\_of\_replicas: 1
>
> The master node is elected automatically.
>
> Before I index data, the state of the cluster is green. After I index
> data, the state of the cluster becomes yellow. Some replica shards are not
> allocated.
>
> But if I add another node and now the cluster consists of three nodes,
> then I index data and the state of the cluster becomes green.
>
> The version of ES that I use is 1.1.
>
> Question 1:
> If the replica number is 1, do I have to have at least 3 nodes to
> assure the state of the cluster is green?
>
> Question 2:
> I have observed that one (not the master node) of the three nodes just
> has primary nodes. What's the mechanism ES uses to allocate primary/replia
> shards?
>
> Thanks anyway.
>
> --
> 宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
>
> --
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> [https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.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:  [@flyer](https://discuss.elastic.co/u/flyer)
#### Post date: [June 6, 2014, 8:49am UTC](https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944/3 "2014-06-06T08:49:39Z")
The configurations on the two nodes are almost the same except the \*\*
node.name\*\*.
The first question is very strange.
I I run the same config on another cluster of two nodes and after I index
data, the state of the cluster is green. I have no idea why this
happened......Is there something I ignore?
I want to know how ES allocates nodes. Is there some reference? I googled
but couldn't find it.
Thank you 😃
On Fri, Jun 6, 2014 at 3:05 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \<[joergprante@gmail.com](mailto:joergprante@gmail.com)
> wrote:
> 1. No. Did you change the configuration? You have two data nodes connected?
>
> 2. You do not need to be concerned where primary shards are allocated,
> secondary shards play the same role (except primaries receive writes first
> a few milliseconds earlier than secondaries). Elasticsearch randomly
> allocates shards on all the available nodes. If nodes go away, shards on
> remaining nodes are promoted to primaries automatically.
>
> Jörg
>
> On Fri, Jun 6, 2014 at 5:41 AM, flyer [flyer103@gmail.com](mailto:flyer103@gmail.com) wrote:
>
> > I have a cluster of two nodes, and set the configs for shard number and
> > replica number as following:
> >
> > index.number\_of\_shards: 10
> >
> > index.number\_of\_replicas: 1
> >
> > The master node is elected automatically.
> >
> > Before I index data, the state of the cluster is green. After I index
> > data, the state of the cluster becomes yellow. Some replica shards are not
> > allocated.
> >
> > But if I add another node and now the cluster consists of three nodes,
> > then I index data and the state of the cluster becomes green.
> >
> > The version of ES that I use is 1.1.
> >
> > Question 1:
> > If the replica number is 1, do I have to have at least 3 nodes to
> > assure the state of the cluster is green?
> >
> > Question 2:
> > I have observed that one (not the master node) of the three nodes
> > just has primary nodes. What's the mechanism ES uses to allocate
> > primary/replia shards?
> >
> > Thanks anyway.
> >
> > --
> > 宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
> >
> > --
> > You received this message because you are subscribed to the Google Groups
> > "elasticsearch" group.
> > To unsubscribe from this group and stop receiving emails from it, send an
> > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com).
> > To view this discussion on the web visit
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> > [https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.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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> [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoES%2Bd5gmo\_OS-Si2dXLPGbk\_q-B554WeL13HC0DfFY1vw%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoES%2Bd5gmo_OS-Si2dXLPGbk_q-B554WeL13HC0DfFY1vw%40mail.gmail.com?utm_medium=email&utm_source=footer)
> .
> For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
--
宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
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### Author:  [@flyer](https://discuss.elastic.co/u/flyer)
#### Post date: [June 6, 2014, 9:27am UTC](https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944/4 "2014-06-06T09:27:22Z")
It's the ES version that causes the first problem.
In my previous test, one node use ES-1.1.1 and the other node use ES-1.1.2.
After I indexed data, the state of the cluster was yellow other than green.
I think there're some compatibility problems between the two versions.
Thank you very much 😃
On Fri, Jun 6, 2014 at 4:49 PM, flyer [flyer103@gmail.com](mailto:flyer103@gmail.com) wrote:
> The configurations on the two nodes are almost the same except the \*\*
> node.name\*\*.
>
> The first question is very strange.
> I I run the same config on another cluster of two nodes and after I index
> data, the state of the cluster is green. I have no idea why this
> happened......Is there something I ignore?
>
> I want to know how ES allocates nodes. Is there some reference? I googled
> but couldn't find it.
>
> Thank you 😃
>
> On Fri, Jun 6, 2014 at 3:05 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \<
> [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote:
>
> > 1. No. Did you change the configuration? You have two data nodes
> > connected?
> >
> > 2. You do not need to be concerned where primary shards are allocated,
> > secondary shards play the same role (except primaries receive writes first
> > a few milliseconds earlier than secondaries). Elasticsearch randomly
> > allocates shards on all the available nodes. If nodes go away, shards on
> > remaining nodes are promoted to primaries automatically.
> >
> > Jörg
> >
> > On Fri, Jun 6, 2014 at 5:41 AM, flyer [flyer103@gmail.com](mailto:flyer103@gmail.com) wrote:
> >
> > > I have a cluster of two nodes, and set the configs for shard number and
> > > replica number as following:
> > >
> > > index.number\_of\_shards: 10
> > >
> > > index.number\_of\_replicas: 1
> > >
> > > The master node is elected automatically.
> > >
> > > Before I index data, the state of the cluster is green. After I index
> > > data, the state of the cluster becomes yellow. Some replica shards are not
> > > allocated.
> > >
> > > But if I add another node and now the cluster consists of three nodes,
> > > then I index data and the state of the cluster becomes green.
> > >
> > > The version of ES that I use is 1.1.
> > >
> > > Question 1:
> > > If the replica number is 1, do I have to have at least 3 nodes to
> > > assure the state of the cluster is green?
> > >
> > > Question 2:
> > > I have observed that one (not the master node) of the three nodes
> > > just has primary nodes. What's the mechanism ES uses to allocate
> > > primary/replia shards?
> > >
> > > Thanks anyway.
> > >
> > > --
> > > 宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
> > >
> > > --
> > > You received this message because you are subscribed to the Google
> > > Groups "elasticsearch" group.
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> > > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com).
> > > To view this discussion on the web visit
> > > [https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.com)
> > > [https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.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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> > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoES%2Bd5gmo\_OS-Si2dXLPGbk\_q-B554WeL13HC0DfFY1vw%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoES%2Bd5gmo_OS-Si2dXLPGbk_q-B554WeL13HC0DfFY1vw%40mail.gmail.com?utm_medium=email&utm_source=footer)
> > .
> > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
>
> --
> 宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
--
宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
--
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---
### Author:  [@jprante](https://discuss.elastic.co/u/jprante)
#### Post date: [June 6, 2014, 9:57am UTC](https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944/5 "2014-06-06T09:57:36Z")
You must use same version throughout the cluster. Combination of different
versions is not always recognized and not warned, it will result in
unexpected behavior or strange error messages.
Jörg
On Fri, Jun 6, 2014 at 11:27 AM, flyer [flyer103@gmail.com](mailto:flyer103@gmail.com) wrote:
> It's the ES version that causes the first problem.
>
> In my previous test, one node use ES-1.1.1 and the other node use
> ES-1.1.2. After I indexed data, the state of the cluster was yellow other
> than green. I think there're some compatibility problems between the two
> versions.
>
> Thank you very much 😃
>
> On Fri, Jun 6, 2014 at 4:49 PM, flyer [flyer103@gmail.com](mailto:flyer103@gmail.com) wrote:
>
> > The configurations on the two nodes are almost the same except the \*\*
> > node.name\*\*.
> >
> > The first question is very strange.
> > I I run the same config on another cluster of two nodes and after I index
> > data, the state of the cluster is green. I have no idea why this
> > happened......Is there something I ignore?
> >
> > I want to know how ES allocates nodes. Is there some reference? I googled
> > but couldn't find it.
> >
> > Thank you 😃
> >
> > On Fri, Jun 6, 2014 at 3:05 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \<
> > [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote:
> >
> > > 1. No. Did you change the configuration? You have two data nodes
> > > connected?
> > >
> > > 2. You do not need to be concerned where primary shards are allocated,
> > > secondary shards play the same role (except primaries receive writes first
> > > a few milliseconds earlier than secondaries). Elasticsearch randomly
> > > allocates shards on all the available nodes. If nodes go away, shards on
> > > remaining nodes are promoted to primaries automatically.
> > >
> > > Jörg
> > >
> > > On Fri, Jun 6, 2014 at 5:41 AM, flyer [flyer103@gmail.com](mailto:flyer103@gmail.com) wrote:
> > >
> > > > I have a cluster of two nodes, and set the configs for shard number and
> > > > replica number as following:
> > > >
> > > > index.number\_of\_shards: 10
> > > >
> > > > index.number\_of\_replicas: 1
> > > >
> > > > The master node is elected automatically.
> > > >
> > > > Before I index data, the state of the cluster is green. After I index
> > > > data, the state of the cluster becomes yellow. Some replica shards are not
> > > > allocated.
> > > >
> > > > But if I add another node and now the cluster consists of three nodes,
> > > > then I index data and the state of the cluster becomes green.
> > > >
> > > > The version of ES that I use is 1.1.
> > > >
> > > > Question 1:
> > > > If the replica number is 1, do I have to have at least 3 nodes to
> > > > assure the state of the cluster is green?
> > > >
> > > > Question 2:
> > > > I have observed that one (not the master node) of the three nodes
> > > > just has primary nodes. What's the mechanism ES uses to allocate
> > > > primary/replia shards?
> > > >
> > > > Thanks anyway.
> > > >
> > > > --
> > > > 宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
> > > >
> > > > --
> > > > You received this message because you are subscribed to the Google
> > > > Groups "elasticsearch" group.
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> > > > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com).
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> > > > [https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKLbBG-o6JmkbPAAvGBP8t8Bdp-ONEWEFK5kGW%3Dcyn-h-O6dsg%40mail.gmail.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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> > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoES%2Bd5gmo\_OS-Si2dXLPGbk\_q-B554WeL13HC0DfFY1vw%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoES%2Bd5gmo_OS-Si2dXLPGbk_q-B554WeL13HC0DfFY1vw%40mail.gmail.com?utm_medium=email&utm_source=footer)
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> > --
> > 宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
>
> --
> 宠辱不惊，闲看庭前花开花落；去留无意，漫随天边云卷云舒。
>
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> For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
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---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:24am UTC](https://discuss.elastic.co/t/if-i-set-index-number-of-replica-1-then-the-minimum-number-of-nodes-should-be-3-to-assure-that-the-status-of-the-cluster-is-gree/17944/6 "2017-07-06T01:24:13Z")