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@krojew krojew released this 21 Dec 08:10
· 268 commits to master since this release
6.0.0
d639de8

This version is a departure from legacy API design, stemming from the sync version migration. Due to large
performance issues and lack of dynamic topology handling in earlier versions, a decision has been made to cut
the ties and focus on delivering the best functionality without legacy burden. The API surface changes are
quite large, but everyone is encouraged to update - the performance improvements and new features cannot be
understated.

New

  • Topology-aware load balancing: TopologyAwareNodeDistanceEvaluator and TopologyAwareLoadBalancingStrategy.
  • New ReconnectionPolicy used when trying to re-establish connections to downed nodes.
  • Error now implements standard Error.
  • SessionBuilder introduced as the preferred way to create a session.
  • Added missing traits for BatchType and QueryFlags.
  • ToString implementation for SimpleServerEvent.
  • Standard trait implementations for event frames.
  • contains_column, is_empty_by_name and is_empty functions for Row.
  • Display implementation for public enums.
  • Missing traits for PreparedMetadata, Value, Consistency and ColType.
  • New PreparedMetadataFlags.
  • New ClusterMetadata representing information about a cluster.
  • Extracted protocol functionality to separate cassandra-protocol crate.
  • Passing final auth data from the server to SaslAuthenticator.
  • SpeculativeExecutionPolicy for speculative execution control.

Changed

  • All with_name fields or args in the query API are now bool instead of Option<bool>
  • flags field removed from QueryParams (flags are now derived from the other fields at serialization time)
  • Rewritten transport layer for massive performance improvements (including removing bb8). This
    involves changing a large portion of public API related to transport and server events.
  • Rewritten event mechanism - now you can subscribe to server events via create_event_receiver() in Session.
  • Replaced RowsMetadataFlag, QueryFlags and frame::Flags vectors with bitflags.
  • Changed Target and ChangeType enums to SchemaChangeTarget and SchemaChangeType.
  • The varint type now uses num::BigInt representation (this implies Decimal also uses "big" types).
  • Removed unstable-dynamic-cluster feature, since it wasn't working as expected and introduced performance
    penalty. Dynamic topology handling is now built-in.
  • Removed AsBytes in favor of new Serialize trait due to performance penalty.
  • Removed FromSingleByte and AsByte in favor of From/TryFrom.
  • Removed traits along with async-trait dependency: BatchExecutor, ExecExecutor, PrepareExecutor,
    QueryExecutor, GetConnection and CdrsSession. Everything is now embedded directly in Session.
  • Load balancing strategy now returns query plans, rather than individual nodes, and operates on cluster metadata.
  • Removed SingleNode load balancing strategy.
  • Removed empty SimpleError.
  • Renamed connect_generic_static to connect_generic.
  • Removed GetRetryPolicy.
  • Renamed ChangeSchemeOptions to SchemaChangeOptions.
  • Protocol version can now be selected at run time.
  • Value now directly contains the value in the Some variant instead of a separate body field.
  • Consistent naming convention in all builders.
  • Split protocol-level parameters from high-level statement parameters (QueryParams vs StatementParams) and
    simplified API.
  • add_query_prepared for batch queries now takes PreparedQuery by reference.
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