Deprecated

Features listed in this section should no longer be used, because they are considered obsolete and may get removed in a future release. They are currently kept for backward compatibility. There are usually better alternatives to replace the old features with:

• MMFiles Storage Engine: The MMFiles storage engine was deprecated in version 3.6.0 and removed in 3.7.0.

  MMFiles specific startup options still exist but will also be removed. This will affect the following options:

  • --compaction.*
  • --database.force-sync-properties
  • --database.index-threads
  • --database.maximal-journal-size
  • --database.throw-collection-not-loaded-error
  • --ttl.only-loaded-collection
  • --wal.*

  The collection attributes doCompact, indexBuckets, isVolatile, journalSize and path are only used with MMFiles and are thus also deprecated. They are completely ignored when specified in requests.

• Export API: The export REST API is deprecated and will be removed in a future version. Instead of using this API, please use an AQL query with a streaming cursor to dump the contents of a collection.

• Batch Requests API: The batch request REST API is deprecated and will be removed in a future version. Instead of using this API, please use the HTTP Interface for Documents that can insert, update, replace or remove arrays of documents.

• Simple Queries: Idiomatic interface in arangosh to perform trivial queries. They are superseded by AQL queries, which can also be run in arangosh. AQL is a language on its own and way more powerful than Simple Queries could ever be. In fact, the (still supported) Simple Queries are translated internally to AQL, then the AQL query is optimized and run against the database in recent versions, because of better performance and reduced maintenance complexity.

• Accessing collections by ID instead of by name: Accessing collections by their internal ID instead of accessing them by name is deprecated and highly discouraged. This functionality may be removed in future versions of ArangoDB.

• Old metrics REST API: The old metrics API under /_admin/metrics is deprecated and replaced by a new one under /_admin/metrics/v2 from version 3.8.0 on. This step was necessary because the old API did not follow quite a few Prometheus guidelines for metrics.

• Statistics REST API: The endpoints /_admin/statistics and /_admin/statistics-description are deprecated in favor of the new metrics API under /_admin/metrics/v2. The metrics API provides a lot more information than the statistics API, so it is much more useful.

• Replication logger-follow REST API: The endpoint /_api/replication/logger-follow is deprecated since 3.4.0 and may be removed in a future version. Client applications should use the REST API endpoint /_api/wal/tail instead, which is available since ArangoDB 3.3.

• Older cluster REST API endpoints: The following endpoints are simply redirects since ArangoDB 3.7 and are thus deprecated from ArangoDB 3.8 onwards:

  • /_admin/clusterNodeVersion: redirects to /_admin/cluster/nodeVersion
  • /_admin/clusterNodeEngine: redirects to /_admin/cluster/nodeEngine
  • /_admin/clusterNodeStats: redirects to /_admin/cluster/nodeStatistics
  • /_admin/clusterStatistics: redirects to /_admin/cluster/statistics

  The redirecting endpoints will be removed in a future version of ArangoDB. Their usage in client applications can be replaced by the endpoints they redirect to.

• Loading and unloading of collections: The JavaScript functions for explicitly loading and unloading collections, db.<collection-name>.load() and db.<collection-name>.unload() and their REST API endpoints PUT /_api/collection/<collection-name>/load and PUT /_api/collection/<collection-name>/unload are deprecated in 3.8. There should be no need to explicitly load or unload a collection with the RocksDB storage engine. The load/unload functionality was useful only with the MMFiles storage engine, which is not available anymore since 3.7.

• Actions: Snippets of JavaScript code on the server-side for minimal custom endpoints. Since the Foxx revamp in 3.0, it became really easy to write Foxx Microservices, which allow you to define custom endpoints even with complex business logic.

  From v3.5.0 on, the system collections _routing and _modules are not created anymore when the _system database is first created (blank new data folder). They are not actively removed, they remain on upgrade or backup restoration from previous versions.

• Outdated AQL functions: The following AQL functions are deprecated and their usage is discouraged:
  • IS_IN_POLYGON
  • NEAR
  • WITHIN
  • WITHIN_RECTANGLE

  See Geo functions for substitutes.

• bfs option in AQL graph traversal: Using the bfs attribute inside traversal options is deprecated since v3.8.0. The preferred way to start a breadth-first traversal is by using the new order attribute, and setting it to a value of bfs.

• Overwrite option: The overwrite option for insert operations (either single document operations or AQL INSERT operations) is deprecated in favor of the overwriteMode option, which provides more flexibility.

• minReplicationFactor collection option: The minReplicationFactor option for collections has been renamed to writeConcern. If minReplicationFactor is specified and no writeConcern is set, the minReplicationFactor value will still be picked up and used as writeConcern value. However, this compatibility mode will be removed eventually, so changing applications from using minReplicationFactor to writeConcern is advised.

• Outdated startup options

  The following arangod startup options are deprecated and will be removed in a future version:

  • --database.old-system-collections (no need to use it anymore)
  • --server.jwt-secret (use --server.jwt-secret-keyfile)
  • --arangosearch.threads / --arangosearch.threads-limit (use the following options instead):
    • --arangosearch.commit-threads
    • --arangosearch.commit-threads-idle
    • --arangosearch.consolidation-threads
    • --arangosearch.consolidation-threads-idle
  • --rocksdb.exclusive-writes (was intended only as a stopgap measure to make porting applications from MMFiles to RocksDB easier)
  • --http.allow-method-override: this option allows incoming HTTP POST request to override the actual HTTP method used by setting one of the special HTTP headers x-http-method, x-method-override or x-http-method-override. This was originally intended for very restricted callers, which only supported HTTP GET and HTTP POST, but seems very unnecessary nowadways.
  • --http.hide-product-header: whether or not to hide the Server: ArangoDB header in all responses served by arangod.

  The following options are deprecated for arangorestore:

  • --default-number-of-shards (use --number-of-shards instead)
  • --default-replication-factor (use --replication-factor instead)

  The following startup options are deprecated in arangod and all client tools:

  • --log (use --log.level instead)
  • --log.use-local-time (use --log.time-format instead)
  • --log.use-microtime (use --log.time-format instead)
  • --log.performance (use --log.level instead)

• Obsoleted startup options: Any startup options marked as obsolete can be removed in any future version of ArangoDB, so their usage is highly discouraged. Their functionality is already removed, but they still exist to prevent unknown startup option errors.

• HTTP and JavaScript traversal APIs: The HTTP traversal API is deprecated since version 3.4.0. The JavaScript traversal module @arangodb/graph/traversal is also deprecated since then. The preferred way to traverse graphs is via AQL.

• JavaScript-based AQL graph functions: The following JavaScript-based AQL graph functions are deprecated:
  • arangodb::GRAPH_EDGES
  • arangodb::GRAPH_VERTICES
  • arangodb::GRAPH_NEIGHBORS
  • arangodb::GRAPH_COMMON_NEIGHBORS
  • arangodb::GRAPH_COMMON_PROPERTIES
  • arangodb::GRAPH_PATHS
  • arangodb::GRAPH_SHORTEST_PATH
  • arangodb::GRAPH_DISTANCE_TO
  • arangodb::GRAPH_ABSOLUTE_ECCENTRICITY
  • arangodb::GRAPH_ECCENTRICITY
  • arangodb::GRAPH_ABSOLUTE_CLOSENESS
  • arangodb::GRAPH_CLOSENESS
  • arangodb::GRAPH_ABSOLUTE_BETWEENNESS
  • arangodb::GRAPH_BETWEENNESS
  • arangodb::GRAPH_RADIUS
  • arangodb::GRAPH_DIAMETER