File Descriptors
editFile Descriptors
editThis is only relevant for Linux and macOS and can be safely ignored if running Elasticsearch on Windows. On Windows the JVM uses an API limited only by available resources.
Elasticsearch uses a lot of file descriptors or file handles. Running out of file descriptors can be disastrous and will most probably lead to data loss. Make sure to increase the limit on the number of open files descriptors for the user running Elasticsearch to 65,535 or higher.
For the .zip
and .tar.gz
packages, set ulimit -n 65535
as
root before starting Elasticsearch, or set nofile
to 65535
in
/etc/security/limits.conf
.
On macOS, you must also pass the JVM option -XX:-MaxFDLimit
to Elasticsearch in order for it to make use of the higher file descriptor limit.
RPM and Debian packages already default the maximum number of file descriptors to 65535 and do not require further configuration.
You can check the max_file_descriptors
configured for each node
using the Nodes stats API, with:
response = client.nodes.stats( metric: 'process', filter_path: '**.max_file_descriptors' ) puts response
GET _nodes/stats/process?filter_path=**.max_file_descriptors