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7f32e8c707
BlobContainer used to provide async APIs which are not used internally. The implementation of these APIs are also not async by nature and neither is any of the pluggable BlobContainers. This commit simplifies the API to a simple input / output stream and reduces the hierarchy of BlobContainer dramatically. NOTE: This is a breaking change! Closes #7551
123 lines
3.3 KiB
Plaintext
123 lines
3.3 KiB
Plaintext
[[modules-threadpool]]
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== Thread Pool
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A node holds several thread pools in order to improve how threads are
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managed and memory consumption within a node. There are several thread
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pools, but the important ones include:
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[horizontal]
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`index`::
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For index/delete operations, defaults to `fixed`,
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size `# of available processors`.
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queue_size `200`.
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`search`::
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For count/search operations, defaults to `fixed`,
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size `3x # of available processors`.
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queue_size `1000`.
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`suggest`::
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For suggest operations, defaults to `fixed`,
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size `# of available processors`.
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queue_size `1000`.
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`get`::
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For get operations, defaults to `fixed`
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size `# of available processors`.
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queue_size `1000`.
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`bulk`::
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For bulk operations, defaults to `fixed`
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size `# of available processors`.
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queue_size `50`.
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`percolate`::
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For percolate operations, defaults to `fixed`
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size `# of available processors`.
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queue_size `1000`.
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`snapshot`::
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For snapshot/restore operations, defaults to `scaling`
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keep-alive `5m`,
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size `(# of available processors)/2`.
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`warmer`::
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For segment warm-up operations, defaults to `scaling`
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with a `5m` keep-alive.
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`refresh`::
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For refresh operations, defaults to `scaling`
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with a `5m` keep-alive.
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Changing a specific thread pool can be done by setting its type and
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specific type parameters, for example, changing the `index` thread pool
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to have more threads:
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[source,js]
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--------------------------------------------------
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threadpool:
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index:
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type: fixed
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size: 30
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--------------------------------------------------
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NOTE: you can update threadpool settings live using
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<<cluster-update-settings>>.
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[float]
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[[types]]
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=== Thread pool types
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The following are the types of thread pools that can be used and their
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respective parameters:
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[float]
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==== `cache`
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The `cache` thread pool is an unbounded thread pool that will spawn a
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thread if there are pending requests. Here is an example of how to set
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it:
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[source,js]
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--------------------------------------------------
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threadpool:
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index:
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type: cached
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--------------------------------------------------
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[float]
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==== `fixed`
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The `fixed` thread pool holds a fixed size of threads to handle the
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requests with a queue (optionally bounded) for pending requests that
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have no threads to service them.
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The `size` parameter controls the number of threads, and defaults to the
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number of cores times 5.
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The `queue_size` allows to control the size of the queue of pending
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requests that have no threads to execute them. By default, it is set to
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`-1` which means its unbounded. When a request comes in and the queue is
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full, it will abort the request.
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[source,js]
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--------------------------------------------------
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threadpool:
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index:
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type: fixed
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size: 30
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queue_size: 1000
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--------------------------------------------------
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[float]
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[[processors]]
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=== Processors setting
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The number of processors is automatically detected, and the thread pool
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settings are automatically set based on it. Sometimes, the number of processors
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are wrongly detected, in such cases, the number of processors can be
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explicitly set using the `processors` setting.
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In order to check the number of processors detected, use the nodes info
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API with the `os` flag.
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