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Elastic Docs ›Elasticsearch Guide [7.6] ›Modules ›Indices

Index recovery

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Index recovery

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Peer recovery syncs data from a primary shard to a new or existing shard copy.

Peer recovery automatically occurs when Elasticsearch:

  • Recreates a shard lost during node failure
  • Relocates a shard to another node due to a cluster rebalance or changes to the shard allocation settings

You can view a list of in-progress and completed recoveries using the cat recovery API.

Peer recovery settings

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indices.recovery.max_bytes_per_sec

(Dynamic) Limits total inbound and outbound recovery traffic for each node. Defaults to 40mb.

This limit applies to each node separately. If multiple nodes in a cluster perform recoveries at the same time, the cluster’s total recovery traffic may exceed this limit.

If this limit is too high, ongoing recoveries may consume an excess of bandwidth and other resources, which can destabilize the cluster.

This is a dynamic setting, which means you can set it in each node’s elasticsearch.yml config file and you can update it dynamically using the cluster update settings API. If you set it dynamically then the same limit applies on every node in the cluster. If you do not set it dynamically then you can set a different limit on each node, which is useful if some of your nodes have better bandwidth than others. For example, if you are using Index Lifecycle Management then you may be able to give your hot nodes a higher recovery bandwidth limit than your warm nodes.

Expert peer recovery settings

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You can use the following expert setting to manage resources for peer recoveries.

indices.recovery.max_concurrent_file_chunks

(Dynamic, Expert) Number of file chunk requests sent in parallel for each recovery. Defaults to 2.

You can increase the value of this setting when the recovery of a single shard is not reaching the traffic limit set by indices.recovery.max_bytes_per_sec.

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