Nodes Stats
editNodes Stats
editNodes statistics
editThe cluster nodes stats API allows to retrieve one or more (or all) of the cluster nodes statistics.
GET /_nodes/stats GET /_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 nodeId1
and
nodeId2
. All the nodes selective options are explained
here.
By default, all stats are returned. You can limit this by combining any
of indices
, os
, process
, jvm
, transport
, http
,
fs
, breaker
and 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 |
|
Statistics about the discovery |
|
Statistics about ingest preprocessing |
|
Statistics about adaptive replica selection. See adaptive selection statistics. |
# return just indices GET /_nodes/stats/indices # return just os and process GET /_nodes/stats/os,process # return just process for node with IP address 10.0.0.1 GET /_nodes/10.0.0.1/stats/process
All stats can be explicitly requested via /_nodes/stats/_all
or /_nodes/stats?metric=_all
.
FS information
editThe fs
flag can be set to retrieve
information that concern the file system:
-
fs.timestamp
- Last time the file stores statistics have been refreshed
-
fs.total.total_in_bytes
- Total size (in bytes) of all file stores
-
fs.total.free_in_bytes
- Total number of unallocated bytes in all file stores
-
fs.total.available_in_bytes
- Total number of bytes available to this Java virtual machine on all file stores
-
fs.data
- List of all file stores
-
fs.data.path
- Path to the file store
-
fs.data.mount
- Mount point of the file store (ex: /dev/sda2)
-
fs.data.type
- Type of the file store (ex: ext4)
-
fs.data.total_in_bytes
- Total size (in bytes) of the file store
-
fs.data.free_in_bytes
- Total number of unallocated bytes in the file store
-
fs.data.available_in_bytes
- Total number of bytes available to this Java virtual machine on this file store
-
fs.data.spins
(Linux only) -
Indicates if the file store is backed by spinning storage.
null
means we could not determine it,true
means the device possibly spins andfalse
means it does not (ex: solid-state disks). -
fs.io_stats.devices
(Linux only) - Array of disk metrics for each device that is backing an Elasticsearch data path. These disk metrics are probed periodically and averages between the last probe and the current probe are computed.
-
fs.io_stats.devices.device_name
(Linux only) - The Linux device name.
-
fs.io_stats.devices.operations
(Linux only) - The total number of read and write operations for the device completed since starting Elasticsearch.
-
fs.io_stats.devices.read_operations
(Linux only) - The total number of read operations for the device completed since starting Elasticsearch.
-
fs.io_stats.devices.write_operations
(Linux only) - The total number of write operations for the device completed since starting Elasticsearch.
-
fs.io_stats.devices.read_kilobytes
(Linux only) - The total number of kilobytes read for the device since starting Elasticsearch.
-
fs.io_stats.devices.write_kilobytes
(Linux only) - The total number of kilobytes written for the device since starting Elasticsearch.
-
fs.io_stats.operations
(Linux only) - The total number of read and write operations across all devices used by Elasticsearch completed since starting Elasticsearch.
-
fs.io_stats.read_operations
(Linux only) - The total number of read operations for across all devices used by Elasticsearch completed since starting Elasticsearch.
-
fs.io_stats.write_operations
(Linux only) - The total number of write operations across all devices used by Elasticsearch completed since starting Elasticsearch.
-
fs.io_stats.read_kilobytes
(Linux only) - The total number of kilobytes read across all devices used by Elasticsearch since starting Elasticsearch.
-
fs.io_stats.write_kilobytes
(Linux only) - The total number of kilobytes written across all devices used by Elasticsearch since starting Elasticsearch.
Operating System statistics
editThe os
flag can be set to retrieve statistics that concern
the operating system:
-
os.timestamp
- Last time the operating system statistics have been refreshed
-
os.cpu.percent
- Recent CPU usage for the whole system, or -1 if not supported
-
os.cpu.load_average.1m
- One-minute load average on the system (field is not present if one-minute load average is not available)
-
os.cpu.load_average.5m
- Five-minute load average on the system (field is not present if five-minute load average is not available)
-
os.cpu.load_average.15m
- Fifteen-minute load average on the system (field is not present if fifteen-minute load average is not available)
-
os.mem.total_in_bytes
- Total amount of physical memory in bytes
-
os.mem.free_in_bytes
- Amount of free physical memory in bytes
-
os.mem.free_percent
- Percentage of free memory
-
os.mem.used_in_bytes
- Amount of used physical memory in bytes
-
os.mem.used_percent
- Percentage of used memory
-
os.swap.total_in_bytes
- Total amount of swap space in bytes
-
os.swap.free_in_bytes
- Amount of free swap space in bytes
-
os.swap.used_in_bytes
- Amount of used swap space in bytes
-
os.cgroup.cpuacct.control_group
(Linux only) -
The
cpuacct
control group to which the Elasticsearch process belongs -
os.cgroup.cpuacct.usage_nanos
(Linux only) - The total CPU time (in nanoseconds) consumed by all tasks in the same cgroup as the Elasticsearch process
-
os.cgroup.cpu.control_group
(Linux only) -
The
cpu
control group to which the Elasticsearch process belongs -
os.cgroup.cpu.cfs_period_micros
(Linux only) - The period of time (in microseconds) for how regularly all tasks in the same cgroup as the Elasticsearch process should have their access to CPU resources reallocated.
-
os.cgroup.cpu.cfs_quota_micros
(Linux only) -
The total amount of time (in microseconds) for which all tasks in
the same cgroup as the Elasticsearch process can run during one
period
os.cgroup.cpu.cfs_period_micros
-
os.cgroup.cpu.stat.number_of_elapsed_periods
(Linux only) -
The number of reporting periods (as specified by
os.cgroup.cpu.cfs_period_micros
) that have elapsed -
os.cgroup.cpu.stat.number_of_times_throttled
(Linux only) - The number of times all tasks in the same cgroup as the Elasticsearch process have been throttled.
-
os.cgroup.cpu.stat.time_throttled_nanos
(Linux only) - The total amount of time (in nanoseconds) for which all tasks in the same cgroup as the Elasticsearch process have been throttled.
-
os.cgroup.memory.control_group
(Linux only) -
The
memory
control group to which the Elasticsearch process belongs -
os.cgroup.memory.limit_in_bytes
(Linux only) -
The maximum amount of user memory (including file cache) allowed
for all tasks in the same cgroup as the Elasticsearch process.
This value can be too big to store in a
long
, so is returned as a string so that the value returned can exactly match what the underlying operating system interface returns. Any value that is too large to parse into along
almost certainly means no limit has been set for the cgroup. -
os.cgroup.memory.usage_in_bytes
(Linux only) -
The total current memory usage by processes in the cgroup (in bytes)
by all tasks in the same cgroup as the Elasticsearch process.
This value is stored as a string for consistency with
os.cgroup.memory.limit_in_bytes
.
For the cgroup stats to be visible, cgroups must be compiled into
the kernal, the cpu
and cpuacct
cgroup subsystems must be
configured and stats must be readable from /sys/fs/cgroup/cpu
and /sys/fs/cgroup/cpuacct
.
Process statistics
editThe process
flag can be set to retrieve statistics that concern
the current running process:
-
process.timestamp
- Last time the process statistics have been refreshed
-
process.open_file_descriptors
- Number of opened file descriptors associated with the current process, or -1 if not supported
-
process.max_file_descriptors
- Maximum number of file descriptors allowed on the system, or -1 if not supported
-
process.cpu.percent
- CPU usage in percent, or -1 if not known at the time the stats are computed
-
process.cpu.total_in_millis
- CPU time (in milliseconds) used by the process on which the Java virtual machine is running, or -1 if not supported
-
process.mem.total_virtual_in_bytes
- Size in bytes of virtual memory that is guaranteed to be available to the running process
Indices statistics
editYou can get information about indices stats on node
, indices
, or shards
level.
# Fielddata summarised by node GET /_nodes/stats/indices/fielddata?fields=field1,field2 # Fielddata summarised by node and index GET /_nodes/stats/indices/fielddata?level=indices&fields=field1,field2 # Fielddata summarised by node, index, and shard GET /_nodes/stats/indices/fielddata?level=shards&fields=field1,field2 # You can use wildcards for field names GET /_nodes/stats/indices/fielddata?fields=field*
Supported metrics are:
-
completion
-
docs
-
fielddata
-
flush
-
get
-
indexing
-
merge
-
query_cache
-
recovery
-
refresh
-
request_cache
-
search
-
segments
-
store
-
translog
-
warmer
Search groups
editYou can get statistics about search groups for searches executed on this node.
# All groups with all stats GET /_nodes/stats?groups=_all # Some groups from just the indices stats GET /_nodes/stats/indices?groups=foo,bar
Ingest statistics
editThe ingest
flag can be set to retrieve statistics that concern ingest:
-
ingest.total.count
- The total number of document ingested during the lifetime of this node
-
ingest.total.time_in_millis
- The total time spent on ingest preprocessing documents during the lifetime of this node
-
ingest.total.current
- The total number of documents currently being ingested.
-
ingest.total.failed
- The total number ingest preprocessing operations failed during the lifetime of this node
On top of these overall ingest statistics, these statistics are also provided on a per pipeline basis.
Adaptive selection statistics
editThe adaptive_selection
flag can be set to retrieve statistics that concern
adaptive replica selection. These statistics are
keyed by node. For each node:
-
adaptive_selection.outgoing_searches
- The number of outstanding search requests from the node these stats are for to the keyed node.
-
avg_queue_size
- The exponentially weighted moving average queue size of search requests on the keyed node.
-
avg_service_time_ns
- The exponentially weighted moving average service time of search requests on the keyed node.
-
avg_response_time_ns
- The exponentially weighted moving average response time of search requests on the keyed node.
-
rank
- The rank of this node; used for shard selection when routing search requests.