elasticsearch/docs/reference/elasticsearch-plugins/repository-hdfs-config.md

mapped_pages
https://www.elastic.co/guide/en/elasticsearch/plugins/current/repository-hdfs-config.html

Configuration properties [repository-hdfs-config]

Once installed, define the configuration for the hdfs repository through the REST API:

PUT _snapshot/my_hdfs_repository
{
  "type": "hdfs",
  "settings": {
    "uri": "hdfs://namenode:8020/",
    "path": "elasticsearch/repositories/my_hdfs_repository",
    "conf.dfs.client.read.shortcircuit": "true"
  }
}

The following settings are supported:

uri

The uri address for hdfs. ex: "hdfs://:/". (Required)

path

The file path within the filesystem where data is stored/loaded. ex: "path/to/file". (Required)

load_defaults

Whether to load the default Hadoop configuration or not. (Enabled by default)

conf.<key>

Inlined configuration parameter to be added to Hadoop configuration. (Optional) Only client oriented properties from the hadoop core and hdfs configuration files will be recognized by the plugin.

compress

Whether to compress the metadata or not. (Enabled by default)

max_restore_bytes_per_sec

Throttles per node restore rate. Defaults to unlimited. Note that restores are also throttled through recovery settings.

max_snapshot_bytes_per_sec

Throttles per node snapshot rate. Defaults to 40mb per second. Note that if the recovery settings for managed services are set, then it defaults to unlimited, and the rate is additionally throttled through recovery settings.

readonly

Makes repository read-only. Defaults to false.

chunk_size

Override the chunk size. (Disabled by default)

security.principal

Kerberos principal to use when connecting to a secured HDFS cluster. If you are using a service principal for your elasticsearch node, you may use the _HOST pattern in the principal name and the plugin will replace the pattern with the hostname of the node at runtime (see Creating the Secure Repository).

replication_factor

The replication factor for all new HDFS files created by this repository. Must be greater or equal to dfs.replication.min and less or equal to dfs.replication.max HDFS option. Defaults to using HDFS cluster setting.

A note on HDFS availability [repository-hdfs-availability]

When you initialize a repository, its settings are persisted in the cluster state. When a node comes online, it will attempt to initialize all repositories for which it has settings. If your cluster has an HDFS repository configured, then all nodes in the cluster must be able to reach HDFS when starting. If not, then the node will fail to initialize the repository at start up and the repository will be unusable. If this happens, you will need to remove and re-add the repository or restart the offending node.