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arangodb/Documentation/DocuBlocks/Rest/Replication/put_api_replication_applier.md

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@startDocuBlock put_api_replication_applier @brief fetch the current replication configuration

@RESTHEADER{GET /_api/replication/applier-config, Return configuration of replication applier, handleCommandApplierGetConfig}

@RESTDESCRIPTION Returns the configuration of the replication applier.

The body of the response is a JSON object with the configuration. The following attributes may be present in the configuration:

  • endpoint: the logger server to connect to (e.g. "tcp://192.168.173.13:8529").

  • database: the name of the database to connect to (e.g. "_system").

  • username: an optional ArangoDB username to use when connecting to the endpoint.

  • password: the password to use when connecting to the endpoint.

  • maxConnectRetries: the maximum number of connection attempts the applier will make in a row. If the applier cannot establish a connection to the endpoint in this number of attempts, it will stop itself.

  • connectTimeout: the timeout (in seconds) when attempting to connect to the endpoint. This value is used for each connection attempt.

  • requestTimeout: the timeout (in seconds) for individual requests to the endpoint.

  • chunkSize: the requested maximum size for log transfer packets that is used when the endpoint is contacted.

  • autoStart: whether or not to auto-start the replication applier on (next and following) server starts

  • adaptivePolling: whether or not the replication applier will use adaptive polling.

  • includeSystem: whether or not system collection operations will be applied

  • autoResync: whether or not the slave should perform a full automatic resynchronization with the master in case the master cannot serve log data requested by the slave, or when the replication is started and no tick value can be found.

  • autoResyncRetries: number of resynchronization retries that will be performed in a row when automatic resynchronization is enabled and kicks in. Setting this to 0 will effectively disable autoResync. Setting it to some other value will limit the number of retries that are performed. This helps preventing endless retries in case resynchronizations always fail.

  • initialSyncMaxWaitTime: the maximum wait time (in seconds) that the initial synchronization will wait for a response from the master when fetching initial collection data. This wait time can be used to control after what time the initial synchronization will give up waiting for a response and fail. This value is relevant even for continuous replication when autoResync is set to true because this may re-start the initial synchronization when the master cannot provide log data the slave requires. This value will be ignored if set to 0.

  • connectionRetryWaitTime: the time (in seconds) that the applier will intentionally idle before it retries connecting to the master in case of connection problems. This value will be ignored if set to 0.

  • idleMinWaitTime: the minimum wait time (in seconds) that the applier will intentionally idle before fetching more log data from the master in case the master has already sent all its log data. This wait time can be used to control the frequency with which the replication applier sends HTTP log fetch requests to the master in case there is no write activity on the master. This value will be ignored if set to 0.

  • idleMaxWaitTime: the maximum wait time (in seconds) that the applier will intentionally idle before fetching more log data from the master in case the master has already sent all its log data and there have been previous log fetch attempts that resulted in no more log data. This wait time can be used to control the maximum frequency with which the replication applier sends HTTP log fetch requests to the master in case there is no write activity on the master for longer periods. This configuration value will only be used if the option adaptivePolling is set to true. This value will be ignored if set to 0.

  • requireFromPresent: if set to true, then the replication applier will check at start whether the start tick from which it starts or resumes replication is still present on the master. If not, then there would be data loss. If requireFromPresent is true, the replication applier will abort with an appropriate error message. If set to false, then the replication applier will still start, and ignore the data loss.

  • verbose: if set to true, then a log line will be emitted for all operations performed by the replication applier. This should be used for debugging replication problems only.

  • restrictType: the configuration for restrictCollections

  • restrictCollections: the optional array of collections to include or exclude, based on the setting of restrictType

@RESTRETURNCODES

@RESTRETURNCODE{200} is returned if the request was executed successfully.

@RESTRETURNCODE{405} is returned when an invalid HTTP method is used.

@RESTRETURNCODE{500} is returned if an error occurred while assembling the response.

@EXAMPLES

@EXAMPLE_ARANGOSH_RUN{RestReplicationApplierGetConfig} var url = "/_api/replication/applier-config"; var response = logCurlRequest('GET', url);

assert(response.code === 200);
logJsonResponse(response);

@END_EXAMPLE_ARANGOSH_RUN @endDocuBlock