# Primary and replica set question? **URL:** \ **Category:** Elasticsearch\ **Created:** [January 18, 2013, 12:08pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408 "2013-01-18T12:08:41Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Janusz\_Dalecki](https://avatars.discourse-cdn.com/v4/letter/j/73ab20/32.png) [@Janusz\_Dalecki](https://discuss.elastic.co/u/Janusz_Dalecki)\ **Post date:** [January 18, 2013, 12:08pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/1 "2013-01-18T12:08:41Z")
Hi, I have run three nodes (on one laptop) and expected that by default only one replica is going to be created (5 shards and one replica right?). However when I run plugin head GUI I can see two replicas for shard 0 (“\*Dragon Man” as primary, \*_Frost, Deacon – replica, Stygorr - replica_) – why? Am I missing something? Regards, Janusz -- ---
**Author:** ![Clinton\_Gormley](https://avatars.discourse-cdn.com/v4/letter/c/50afbb/32.png) [@Clinton\_Gormley](https://discuss.elastic.co/u/Clinton_Gormley)\ **Post date:** [January 18, 2013, 12:13pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/2 "2013-01-18T12:13:44Z")
On Fri, 2013-01-18 at 04:08 -0800, JD wrote: > Hi, > > I have run three nodes (on one laptop) and expected that by default > only one replica is going to be created (5 shards and one replica > right?). > > However when I run plugin head GUI I can see two replicas for shard 0 > (“Dragon Man” as primary, Frost, Deacon – replica, Stygorr - replica) > – why? > > Am I missing something? I think so. If you have number\_of\_replicas set to 1, then you will have a max of 1 replica per shard. Have a look at the output of this request to get a better idea of what is happening: curl -XGET '[http://127.0.0.1:9200/\_cluster/state?pretty=1](http://127.0.0.1:9200/_cluster/state?pretty=1)' It may be that it is moving a shard from one node to another, which is why it appears twice clint -- ---
**Author:** ![Janusz\_Dalecki](https://avatars.discourse-cdn.com/v4/letter/j/73ab20/32.png) [@Janusz\_Dalecki](https://discuss.elastic.co/u/Janusz_Dalecki)\ **Post date:** [January 18, 2013, 12:54pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/3 "2013-01-18T12:54:30Z")
Hi, That is even more strage On Friday, January 18, 2013 11:08:41 PM UTC+11, JD wrote: > Hi, > > I have run three nodes (on one laptop) and expected that by default only > one replica is going to be created (5 shards and one replica right?). > > However when I run plugin head GUI I can see two replicas for shard 0 (“\*Dragon > Man” as primary, \*_Frost, Deacon – replica, Stygorr - replica_) – why? > > Am I missing something? > > Regards, > > Janusz -- ---
**Author:** ![Janusz\_Dalecki](https://avatars.discourse-cdn.com/v4/letter/j/73ab20/32.png) [@Janusz\_Dalecki](https://discuss.elastic.co/u/Janusz_Dalecki)\ **Post date:** [January 18, 2013, 12:55pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/4 "2013-01-18T12:55:24Z")
OK. I have three nodes and two of them are marked as primary (bold border under plugin head Web GUI) – is that correct? Regards, Janusz On Friday, January 18, 2013 11:08:41 PM UTC+11, JD wrote: > Hi, > > I have run three nodes (on one laptop) and expected that by default only > one replica is going to be created (5 shards and one replica right?). > > However when I run plugin head GUI I can see two replicas for shard 0 (“\*Dragon > Man” as primary, \*_Frost, Deacon – replica, Stygorr - replica_) – why? > > Am I missing something? > > Regards, > > Janusz -- ---
**Author:** ![Janusz\_Dalecki](https://avatars.discourse-cdn.com/v4/letter/j/73ab20/32.png) [@Janusz\_Dalecki](https://discuss.elastic.co/u/Janusz_Dalecki)\ **Post date:** [January 18, 2013, 2:07pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/5 "2013-01-18T14:07:18Z")
Sorry. Just clarification. Can I have few primary shards on a few nodes? Regards, Janusz On Friday, January 18, 2013 11:08:41 PM UTC+11, JD wrote: > Hi, > > I have run three nodes (on one laptop) and expected that by default only > one replica is going to be created (5 shards and one replica right?). > > However when I run plugin head GUI I can see two replicas for shard 0 (“\*Dragon > Man” as primary, \*_Frost, Deacon – replica, Stygorr - replica_) – why? > > Am I missing something? > > Regards, > > Janusz -- ---
**Author:** ![Janusz\_Dalecki](https://avatars.discourse-cdn.com/v4/letter/j/73ab20/32.png) [@Janusz\_Dalecki](https://discuss.elastic.co/u/Janusz_Dalecki)\ **Post date:** [January 18, 2013, 2:17pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/6 "2013-01-18T14:17:39Z")
Sorry. I have been looking across different indexes - my appology. All good, Regards, Janusz On Friday, January 18, 2013 11:08:41 PM UTC+11, JD wrote: > Hi, > > I have run three nodes (on one laptop) and expected that by default only > one replica is going to be created (5 shards and one replica right?). > > However when I run plugin head GUI I can see two replicas for shard 0 (“\*Dragon > Man” as primary, \*_Frost, Deacon – replica, Stygorr - replica_) – why? > > Am I missing something? > > Regards, > > Janusz -- ---
**Author:** ![drewr](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/drewr/32/7803_2.png) [@drewr](https://discuss.elastic.co/u/drewr)\ **Post date:** [January 28, 2013, 6:09pm UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/7 "2013-01-28T18:09:38Z")
JD wrote: > Sorry. I have been looking across different indexes - my appology. We have a tool called es2unix[1] which has a shards command for quick visualization of this type of data. Example from my laptop: % curl -O [download.elasticsearch.org/es2unix/es](http://download.elasticsearch.org/es2unix/es); chmod +x es % ./es shards wiki 0 p STARTED 1160290 7.2gb 7776371641 127.0.0.1 Feline wiki 0 r STARTED 1160290 7.2gb 7776371602 127.0.0.1 Amphibius wiki 0 r STARTED 1160290 7.2gb 7776371602 127.0.0.1 Jenkins, Abner wiki 1 r STARTED 1159509 7.5gb 8116295811 127.0.0.1 Feline wiki 1 p STARTED 1159509 7.5gb 8116295811 127.0.0.1 Amphibius wiki 1 r STARTED 1159509 7.5gb 8116295811 127.0.0.1 Jenkins, Abner foo 0 r STARTED 0 79b 79 127.0.0.1 Amphibius foo 0 p STARTED 0 99b 99 127.0.0.1 Jenkins, Abner foo 1 p STARTED 0 99b 99 127.0.0.1 Feline foo 1 r STARTED 0 79b 79 127.0.0.1 Amphibius You can quickly tell that all the shards belong to the wiki index. If you just want the primaries that belong to foo: % ./es shards fo | fgrep ' p ' foo 0 p STARTED 0 99b 99 127.0.0.1 Jenkins, Abner foo 1 p STARTED 0 99b 99 127.0.0.1 Feline Sometimes this is nicer than a graphical tool, especially over ssh. -Drew Footnotes: [1] [GitHub - elastic/es2unix: Command-line ES](https://github.com/elasticsearch/es2unix) -- ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:54am UTC](https://discuss.elastic.co/t/primary-and-replica-set-question/10408/8 "2017-07-06T02:54:21Z")