We are running a 3 node cluster, 25GB each, index size is 3TB at the moment.
Only running indexing, no searches have been made and heap usage moves between 75%-95%.
We are running two parallel indexers, each sending bulks of 1-10000 docs of a few bytes to a few kb each.
- Are 3 nodes with 25GB each not enough for 3TB of data?
- What is ES using all this memory for? I checked, and fielddata stands at 0 (no searches were made).
- One of the nodes is always using 10% more heap than the rest, what could cause this?
ES version 1.7.3, previously were using 1.5.2 and getting the same behavior.