# Garbage Collection problem **URL:** \ **Category:** Elasticsearch\ **Created:** [May 31, 2018, 12:57pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054 "2018-05-31T12:57:37Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![f26227279](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/f26227279/32/21296_2.png) [@f26227279](https://discuss.elastic.co/u/f26227279)\ **Post date:** [May 31, 2018, 12:57pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054/1 "2018-05-31T12:57:37Z")
Hi, my cluster has 4 nodes with 3 shards and 1 replica. Every node has 16G RAM and 8 cores CPU. About 50-60G data per day and now there's 55 indices, 234 shards and 2T total data. The GC problem is a little serious, and how could I improve it? ![image](https://us1.discourse-cdn.com/elastic/original/3X/7/3/738e3f0c6cac8f680996c2ecbdcfeec61b696c54.png) Besides, I found that when I query through Dev Tools, it would return bad gateway and timeout sometimes and the index rate become very slowly. In addition, when I display the dashboard, the index rate would become very slowly too. How can I improve this problem? thank you in advance 🙂 ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [May 31, 2018, 1:22pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054/2 "2018-05-31T13:22:31Z")
May be 234 shards for 4 nodes is too much? ---
**Author:** ![f26227279](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/f26227279/32/21296_2.png) [@f26227279](https://discuss.elastic.co/u/f26227279)\ **Post date:** [May 31, 2018, 1:34pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054/3 "2018-05-31T13:34:02Z")
so 4 nodes with 2 primary shards is better? If yes, I will tune it. whether 2 primary shards slow down the query speed? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [May 31, 2018, 1:48pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054/4 "2018-05-31T13:48:29Z")
I think I already shared that with but let's do it in case I did not. Look at the following resources about sizing: [https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing](https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing) > **[How many shards should I have in my Elasticsearch cluster? | Elastic](https://www.elastic.co/blog/how-many-shards-should-i-have-in-my-elasticsearch-cluster)** > > Elasticsearch is a very versatile platform, that supports a variety of use cases, and provides great flexibility around data organisation and replication strategies. This flexibility can however somet... > **[NetSecureDay: Managing your Black Friday Logs](https://speakerdeck.com/elastic/netsecureday-managing-your-black-friday-logs)** > > Surveiller une application complexe n’est pas une tâche aisée, mais avec les bons outils, ce n’est pas si sorcier. Néanmoins, des périodes fortes telles que les opérations de type « Black Friday » (Vendredi noir) ou période de Noël peuvent pousser... ---
**Author:** ![f26227279](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/f26227279/32/21296_2.png) [@f26227279](https://discuss.elastic.co/u/f26227279)\ **Post date:** [May 31, 2018, 2:32pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054/5 "2018-05-31T14:32:45Z")
could the Force Merge improve the search query speed or reduce the nodes pressure? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [May 31, 2018, 2:51pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054/6 "2018-05-31T14:51:07Z")
Improve search: probably. As long as you are not writing anymore to the indices. Reduce pressure: I'm unsure ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [June 28, 2018, 2:51pm UTC](https://discuss.elastic.co/t/garbage-collection-problem/134054/7 "2018-06-28T14:51:12Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.