# When new ES worker nodes are created? **URL:** \ **Category:** Elasticsearch\ **Created:** [May 19, 2014, 11:15am UTC](https://discuss.elastic.co/t/when-new-es-worker-nodes-are-created/17586 "2014-05-19T11:15:08Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Piotr\_Jacewicz](https://avatars.discourse-cdn.com/v4/letter/p/85e7bf/32.png) [@Piotr\_Jacewicz](https://discuss.elastic.co/u/Piotr_Jacewicz)\ **Post date:** [May 19, 2014, 11:15am UTC](https://discuss.elastic.co/t/when-new-es-worker-nodes-are-created/17586/1 "2014-05-19T11:15:08Z")
Hi, Recently I have found out that on one of the servers my ES create additional node few days after launch, then one more 2 days later. ES on this host was alone node not connected to any cluster. I have already found out that these are worker nodes and number of all nodes on this host is exact equivalent of max number of nodes per host . They were created exactly at midnight. From logs I see that it's right before performing daily reindexing from DB (about 2000 docs, so tiny number). I've got some questions related to that for which I couldn't google the answer: 1. What could cause these nodes to be created (and what usually is the cause - is there any documentation about that)? Was that reindexing init? (actual reindexing is logged after creating a node) 2. Does number of nodes shrink under any circumstances? I'm wondering ... that host was almost completely idle and only daily reindexing was some work, but still small considering index's size. Considering load one node is fairly enough to handle that, so why add more? If it could be caused just by splitting shards and creating replicas to have a 'healthy' cluster, why those nodes were added so late? This all just doesn't add up. Regards, Peter. -- 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 [https://groups.google.com/d/msgid/elasticsearch/344f6e70-65cb-4ac6-af3d-ceb5baf09dc2%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/344f6e70-65cb-4ac6-af3d-ceb5baf09dc2%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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:** [May 19, 2014, 9:34pm UTC](https://discuss.elastic.co/t/when-new-es-worker-nodes-are-created/17586/2 "2014-05-19T21:34:25Z")
The only time a new node will automatically join a cluster is if it has the same cluster.name and you are using multicast discovery. ES does not automatically create nodes for the cluster, there must be something else happening on your end. Regards, Mark Walkom Infrastructure Engineer Campaign Monitor email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) web: [www.campaignmonitor.com](http://www.campaignmonitor.com) On 19 May 2014 21:15, Piotr Jacewicz [piotr.jacewicz.88@gmail.com](mailto:piotr.jacewicz.88@gmail.com) wrote: > Hi, > > Recently I have found out that on one of the servers my ES create > additional node few days after launch, then one more 2 days later. ES on > this host was alone node not connected to any cluster. I have already found > out that these are worker nodes and number of all nodes on this host is > exact equivalent of max number of nodes per host . They were created > exactly at midnight. From logs I see that it's right before performing > daily reindexing from DB (about 2000 docs, so tiny number). > > I've got some questions related to that for which I couldn't google the > answer: > > 1. What could cause these nodes to be created (and what usually is the > cause - is there any documentation about that)? Was that reindexing init? > (actual reindexing is logged after creating a node) > 2. Does number of nodes shrink under any circumstances? > > I'm wondering ... that host was almost completely idle and only daily > reindexing was some work, but still small considering index's size. > Considering load one node is fairly enough to handle that, so why add > more? If it could be caused just by splitting shards and creating replicas > to have a 'healthy' cluster, why those nodes were added so late? This all > just doesn't add up. > > Regards, > Peter. > > -- > 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 > [https://groups.google.com/d/msgid/elasticsearch/344f6e70-65cb-4ac6-af3d-ceb5baf09dc2%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/344f6e70-65cb-4ac6-af3d-ceb5baf09dc2%40googlegroups.com)[https://groups.google.com/d/msgid/elasticsearch/344f6e70-65cb-4ac6-af3d-ceb5baf09dc2%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/344f6e70-65cb-4ac6-af3d-ceb5baf09dc2%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- 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 [https://groups.google.com/d/msgid/elasticsearch/CAEM624a%3Dhq5eozzSCR3N1OGkKEK1WBN6foWwudx3A1%2BSL2qJYg%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAEM624a%3Dhq5eozzSCR3N1OGkKEK1WBN6foWwudx3A1%2BSL2qJYg%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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, 1:28am UTC](https://discuss.elastic.co/t/when-new-es-worker-nodes-are-created/17586/3 "2017-07-06T01:28:21Z")
Closed on July 6, 2017, 1:28am UTC