57 lines
1.8 KiB
Plaintext
57 lines
1.8 KiB
Plaintext
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[[circuit-breaker]]
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=== Circuit Breaker
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Elasticsearch contains multiple circuit breakers used to prevent operations from
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causing an OutOfMemoryError. Each breaker specifies a limit for how much memory
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it can use. Additionally, there is a parent-level breaker that specifies the
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total amount of memory that can be used across all breakers.
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These settings can be dynamically updated on a live cluster with the
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<<cluster-update-settings,cluster-update-settings>> API.
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[[parent-circuit-breaker]]
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[float]
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==== Parent circuit breaker
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The parent-level breaker can be configured with the following setting:
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`indices.breaker.total.limit`::
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Starting limit for overall parent breaker, defaults to 70% of JVM heap.
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[[fielddata-circuit-breaker]]
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[float]
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==== Field data circuit breaker
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The field data circuit breaker allows Elasticsearch to estimate the amount of
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memory a field will require to be loaded into memory. It can then prevent the
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field data loading by raising an exception. By default the limit is configured
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to 60% of the maximum JVM heap. It can be configured with the following
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parameters:
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`indices.breaker.fielddata.limit`::
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Limit for fielddata breaker, defaults to 60% of JVM heap
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`indices.breaker.fielddata.overhead`::
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A constant that all field data estimations are multiplied with to determine a
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final estimation. Defaults to 1.03
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[[request-circuit-breaker]]
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[float]
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==== Request circuit breaker
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The request circuit breaker allows Elasticsearch to prevent per-request data
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structures (for example, memory used for calculating aggregations during a
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request) from exceeding a certain amount of memory.
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`indices.breaker.request.limit`::
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Limit for request breaker, defaults to 40% of JVM heap
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`indices.breaker.request.overhead`::
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A constant that all request estimations are multiplied with to determine a
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final estimation. Defaults to 1
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