The cluster nodes stats API allows to retrieve one or more (or all) of the cluster nodes statistics.
curl -XGET 'http://localhost:9200/_nodes/stats' curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/stats'
The first command retrieves stats of all the nodes in the cluster. The
second command selectively retrieves nodes stats of only
nodeId2. All the nodes selective options are explained
By default, all stats are returned. You can limit this by combining any
thread_pool. For example:
Indices stats about size, document count, indexing and deletion times, search times, field cache size, merges and flushes
File system information, data path, free disk space, read/write stats (see FS information)
HTTP connection information
JVM stats, memory pool information, garbage collection, buffer pools, number of loaded/unloaded classes
Operating system stats, load average, mem, swap (see OS statistics)
Process statistics, memory consumption, cpu usage, open file descriptors (see Process statistics)
Statistics about each thread pool, including current size, queue and rejected tasks
Transport statistics about sent and received bytes in cluster communication
Statistics about the field data circuit breaker
# return indices and os curl -XGET 'http://localhost:9200/_nodes/stats/os' # return just os and process curl -XGET 'http://localhost:9200/_nodes/stats/os,process' # specific type endpoint curl -XGET 'http://localhost:9200/_nodes/stats/process' curl -XGET 'http://localhost:9200/_nodes/10.0.0.1/stats/process'
all flag can be set to return all the stats.
fs flag can be set to retrieve
information that concern the file system:
- Last time the file stores statistics have been refreshed
- Total size (in bytes) of all file stores
- Total number of unallocated bytes in all file stores
- Total number of bytes available to this Java virtual machine on all file stores
- List of all file stores
- Path to the file store
- Mount point of the file store (ex: /dev/sda2)
- Type of the file store (ex: ext4)
- Total size (in bytes) of the file store
- Total number of unallocated bytes in the file store
- Total number of bytes available to this Java virtual machine on this file store
- Indicates if the file store is backed by spinning storage.
nullmeans we could not determine it,
truemeans the device possibly spins and
falsemeans it does not (ex: solid-state disks).
Operating System statisticsedit
os flag can be set to retrieve statistics that concern
the operating system:
- Last time the operating system statistics have been refreshed
- System load average for the last minute, or -1 if not supported
- Total amount of physical memory in bytes
- Amount of free physical memory in bytes
- Percentage of free memory
- Amount of used physical memory in bytes
- Percentage of used memory
- Total amount of swap space in bytes
- Amount of free swap space in bytes
- Amount of used swap space in bytes
process flag can be set to retrieve statistics that concern
the current running process:
- Last time the process statistics have been refreshed
- Number of opened file descriptors associated with the current process, or -1 if not supported
- Maximum number of file descriptors allowed on the system, or -1 if not supported
- CPU usage in percent, or -1 if not known at the time the stats are computed
- CPU time (in milliseconds) used by the process on which the Java virtual machine is running, or -1 if not supported
- Size in bytes of virtual memory that is guaranteed to be available to the running process
Field data statisticsedit
You can get information about field data memory usage on node level or on index level.
# Node Stats curl -XGET 'http://localhost:9200/_nodes/stats/indices/?fields=field1,field2&pretty' # Indices Stat curl -XGET 'http://localhost:9200/_stats/fielddata/?fields=field1,field2&pretty' # You can use wildcards for field names curl -XGET 'http://localhost:9200/_stats/fielddata/?fields=field*&pretty' curl -XGET 'http://localhost:9200/_nodes/stats/indices/?fields=field*&pretty'
You can get statistics about search groups for searches executed on this node.
# All groups with all stats curl -XGET 'http://localhost:9200/_nodes/stats?pretty&groups=_all' # Some groups from just the indices stats curl -XGET 'http://localhost:9200/_nodes/stats/indices?pretty&groups=foo,bar'