Solr experts, We found following link <https://www.google.com/url?q=http://lucene.472066.n3.nabble.com/CommitScheduler-Thread-blocked-due-to-excessive-number-of-Merging-Threads-td4353964.html&sa=D&source=hangouts&ust=1523527480128000&usg=AFQjCNENaNhq49nMSj8WtS_Qx-N4K23v0Q> where its mentioned like in 6.2.1 it's faster where as in 6.6 its slower.
We are also facing same issue...with 6.2.1 in our performance environment and we found that CPU usage is around 60 to 70% where as in 6.5.1 it was always more than 95% Settings are same and data size and indexing speed remains same. Pls check the JVM snapshot <https://lh3.googleusercontent.com/-MHYsop5Vovo/Ws3V8KrT2VI/AAAAAAAAALI/GXmcWA4OtPQwwpF09scU5riJ1VHFOUtHQCL0BGAYYCw/h1080/2018-04-11.png> when we index using 6.2.1 Following is the snapshot <https://lh3.googleusercontent.com/-FoOmxYACbKc/Ws3gUQ323rI/AAAAAAAACeA/xdZedHlr1pcRbBrxhNJFPSvZqaH6rIoEACL0BGAYYCw/h363/2018-04-11.png> taken with 6.5.1 Is there any reason why such a huge difference with CPU usage patterns between 6.2.1 and 6.5.1 ? Can we do something in 6.5.1 to make it as 6.2.1? Because we don't want to downgrade to 6.2.1 from 6.5.1. Let us know your thoughts on this. Thanks and Regards, -- Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html