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@songweijia songweijia released this 25 Jun 22:28
· 725 commits to master since this release
v2.0.0
3d6038f

Major improvements since v0.9.2

New Features

  • Enabled external client API.
  • Revived code for using ibverbs API with flow control.
  • Derecho can now be configured with a "restart leader" distinct from its normal leader, and if the enable_backup_restart_leaders option is True, it can also use a list of multiple restart leaders in priority order.
  • Added a build script.
  • The type T in Replicated is now aware of the subgroup ID it belongs to.
  • Moved the ObjectStore out to the new Cascade project.
  • Renamed rpc_port to state_transfer_port in configuration.

Bugfixes

  • Fixed the completion queue overrun issue.
  • Avoided relying on ibv_wc::wr_id (or fi_cq_err_entry::op_context) to determine which remote node failed when a request posted to a queue pair fails. Now uses timeout logic to detect the failure.
  • Refactored p2p_connection code.
  • Stored Persistent state into a file named by SHA256 hash string instead of a type string, which might be longer than filename length limitation.
  • Fixed TCP listen() backlog issue contributing to the slow startup with many nodes.

Dependencies

  • Moved to spdlog v1.3.1
  • Moved to libfabric v1.7.0

Known Issues

  • An update to a subgroup type with Persistent fields is acknowledged (by derecho::rpc::QueryResults<>) when all shard members delivered the update. Persistence is processed in the background off the critical path. Applications must use local_persistentce_callback or global_persistence_callback in group constructor to make sure when the updates are persisted locally or globally.
 /**
  * Bundles together a set of callback functions for message delivery events.
  * These will be invoked by MulticastGroup or ViewManager to hand control back
  * to the client if it wants to implement custom logic to respond to each
  * message's arrival. (Note, this is a client-facing constructor argument,
  * not an internal data structure).
  */
 struct CallbackSet {
     message_callback_t global_stability_callback;
     persistence_callback_t local_persistence_callback = nullptr;
     persistence_callback_t global_persistence_callback = nullptr;
 };
  • A Derecho node cannot join multiple subgroups so far. We plan to add this feature, aka overlapping subgroup, in the near future.
  • Slow startup (It takes several seconds for RDMC to start, please see #160 for more information)
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