54 lines
1.8 KiB
Plaintext
54 lines
1.8 KiB
Plaintext
[[misc-cluster]]
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=== Miscellaneous cluster settings
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[[cluster-read-only]]
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==== Metadata
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An entire cluster may be set to read-only with the following _dynamic_ setting:
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`cluster.blocks.read_only`::
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Make the whole cluster read only (indices do not accept write
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operations), metadata is not allowed to be modified (create or delete
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indices).
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WARNING: Don't rely on this setting to prevent changes to your cluster. Any
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user with access to the <<cluster-update-settings,cluster-update-settings>>
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API can make the cluster read-write again.
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[[cluster-max-tombstones]]
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==== Index Tombstones
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The cluster state maintains index tombstones to explicitly denote indices that
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have been deleted. The number of tombstones maintained in the cluster state is
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controlled by the following property, which cannot be updated dynamically:
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`cluster.indices.tombstones.size`::
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Index tombstones prevent nodes that are not part of the cluster when a delete
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occurs from joining the cluster and reimporting the index as though the delete
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was never issued. To keep the cluster state from growing huge we only keep the
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last `cluster.indices.tombstones.size` deletes, which defaults to 500. You can
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increase it if you expect nodes to be absent from the cluster and miss more
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than 500 deletes. We think that is rare, thus the default. Tombstones don't take
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up much space, but we also think that a number like 50,000 is probably too big.
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[[cluster-logger]]
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==== Logger
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The settings which control logging can be updated dynamically with the
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`logger.` prefix. For instance, to increase the logging level of the
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`indices.recovery` module to `DEBUG`, issue this request:
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[source,js]
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-------------------------------
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PUT /_cluster/settings
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{
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"transient": {
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"logger.org.elasticsearch.indices.recovery": "DEBUG"
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}
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}
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-------------------------------
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