By default, Elasticsearch uses memory mapping (
mmap) to efficiently access indices.
Usually, default values for virtual address space on Linux distributions are too low for Elasticsearch to work properly, which may result in out-of-memory exceptions.
To increase virtual memory, ECK sets the recommended value by default.
The kernel setting
vm.max_map_count=2621441 can be set on the host either directly or by a dedicated init container, which needs to be privileged. If the kernel setting is set directly, you might disable the init container in the Elasticsearch specification:
spec: setVmMaxMapCount: false
For more information, see the Elasticsearch documentation on Virtual memory.
Optionally, you can select a different type of file system implementation for the storage. For possible options, see the store module documentation.
spec: nodes: - nodeCount: 3 config: index.store.type: niofs