119 lines
4.4 KiB
Plaintext
119 lines
4.4 KiB
Plaintext
[[circuit-breaker]]
|
|
=== Circuit breaker settings
|
|
|
|
Elasticsearch contains multiple circuit breakers used to prevent operations from
|
|
causing an OutOfMemoryError. Each breaker specifies a limit for how much memory
|
|
it can use. Additionally, there is a parent-level breaker that specifies the
|
|
total amount of memory that can be used across all breakers.
|
|
|
|
Except where noted otherwise, these settings can be dynamically updated on a
|
|
live cluster with the <<cluster-update-settings,cluster-update-settings>> API.
|
|
|
|
[[parent-circuit-breaker]]
|
|
[float]
|
|
==== Parent circuit breaker
|
|
|
|
The parent-level breaker can be configured with the following settings:
|
|
|
|
`indices.breaker.total.use_real_memory`::
|
|
|
|
_Static_ setting determining whether the parent breaker should take real
|
|
memory usage into account (`true`) or only consider the amount that is
|
|
reserved by child circuit breakers (`false`). Defaults to `true`.
|
|
|
|
`indices.breaker.total.limit`::
|
|
|
|
Starting limit for overall parent breaker, defaults to 70% of JVM heap if
|
|
`indices.breaker.total.use_real_memory` is `false`. If `indices.breaker.total.use_real_memory`
|
|
is `true`, defaults to 95% of the JVM heap.
|
|
|
|
[[fielddata-circuit-breaker]]
|
|
[float]
|
|
==== Field data circuit breaker
|
|
The field data circuit breaker allows Elasticsearch to estimate the amount of
|
|
memory a field will require to be loaded into memory. It can then prevent the
|
|
field data loading by raising an exception. By default the limit is configured
|
|
to 40% of the maximum JVM heap. It can be configured with the following
|
|
parameters:
|
|
|
|
`indices.breaker.fielddata.limit`::
|
|
|
|
Limit for fielddata breaker, defaults to 40% of JVM heap
|
|
|
|
`indices.breaker.fielddata.overhead`::
|
|
|
|
A constant that all field data estimations are multiplied with to determine a
|
|
final estimation. Defaults to 1.03
|
|
|
|
[[request-circuit-breaker]]
|
|
[float]
|
|
==== Request circuit breaker
|
|
|
|
The request circuit breaker allows Elasticsearch to prevent per-request data
|
|
structures (for example, memory used for calculating aggregations during a
|
|
request) from exceeding a certain amount of memory.
|
|
|
|
`indices.breaker.request.limit`::
|
|
|
|
Limit for request breaker, defaults to 60% of JVM heap
|
|
|
|
`indices.breaker.request.overhead`::
|
|
|
|
A constant that all request estimations are multiplied with to determine a
|
|
final estimation. Defaults to 1
|
|
|
|
[[in-flight-circuit-breaker]]
|
|
[float]
|
|
==== In flight requests circuit breaker
|
|
|
|
The in flight requests circuit breaker allows Elasticsearch to limit the memory usage of all
|
|
currently active incoming requests on transport or HTTP level from exceeding a certain amount of
|
|
memory on a node. The memory usage is based on the content length of the request itself. This
|
|
circuit breaker also considers that memory is not only needed for representing the raw request but
|
|
also as a structured object which is reflected by default overhead.
|
|
|
|
`network.breaker.inflight_requests.limit`::
|
|
|
|
Limit for in flight requests breaker, defaults to 100% of JVM heap. This means that it is bound
|
|
by the limit configured for the parent circuit breaker.
|
|
|
|
`network.breaker.inflight_requests.overhead`::
|
|
|
|
A constant that all in flight requests estimations are multiplied with to determine a
|
|
final estimation. Defaults to 2.
|
|
|
|
[[accounting-circuit-breaker]]
|
|
[float]
|
|
==== Accounting requests circuit breaker
|
|
|
|
The accounting circuit breaker allows Elasticsearch to limit the memory
|
|
usage of things held in memory that are not released when a request is
|
|
completed. This includes things like the Lucene segment memory.
|
|
|
|
`indices.breaker.accounting.limit`::
|
|
|
|
Limit for accounting breaker, defaults to 100% of JVM heap. This means that it is bound
|
|
by the limit configured for the parent circuit breaker.
|
|
|
|
`indices.breaker.accounting.overhead`::
|
|
|
|
A constant that all accounting estimations are multiplied with to determine a
|
|
final estimation. Defaults to 1
|
|
|
|
[[script-compilation-circuit-breaker]]
|
|
[float]
|
|
==== Script compilation circuit breaker
|
|
|
|
Slightly different than the previous memory-based circuit breaker, the script
|
|
compilation circuit breaker limits the number of inline script compilations
|
|
within a period of time.
|
|
|
|
See the "prefer-parameters" section of the <<modules-scripting-using,scripting>>
|
|
documentation for more information.
|
|
|
|
`script.context.$CONTEXT.max_compilations_rate`::
|
|
|
|
Limit for the number of unique dynamic scripts within a certain interval
|
|
that are allowed to be compiled for a given context. Defaults to `75/5m`,
|
|
meaning 75 every 5 minutes.
|