Aparna Narayanan

Greetings all,

Additional to references in our earlier tech updates, the core tech crew has lastly accomplished and rolled out Zilliqa model . This model brings with it a number of enhancements and bug fixes. Beneath, we spotlight the extra notable ones.

Core Tech Updates

Lookup node fixes and enhancements: Zilliqa variations to have been virtually solely devoted to shoring up our Lookup nodes. Model brings in all these adjustments, together with: help for customized persistent storage paths , stopping block queries whereas the chain is empty , buffering new block and transaction knowledge whereas syncing up , and a repair for retrieval of state delta from seed nodes .

Other than these built-in adjustments, we’ve additionally re-coded the Lookup to forestall processing JSONRPC queries whereas syncing up. This could stop seeing incorrect API outcomes if the Lookup assigned to course of a request occurs to be out of sync.

P2P communication fixes. After observing the mainnet operation, we realised that the earlier restrict for the variety of connections to the identical peer was too low, so we’ve doubled it ranging from model .We additionally found that the connection counter was not being decremented after a peer will get blacklisted. This meant that after being faraway from the blacklist, a peer could also be unable to ascertain the right variety of connections allowed for it. On an identical be aware, we seen {that a} Lookup node was not clearing peer connection counts throughout every new DS epoch, and this has been fastened on this new model as nicely.

PoW mining enhancements. As talked about final week, we’ve made some enhancements to our mining code based mostly on beneficial suggestions from our mining group. These embrace the flexibility to retry sending PoW options to the proxy server within the occasion of intermittent community points, avoiding downloading all persistence knowledge unnecessarily (and simply resynchronize as a substitute) within the occasion of mining failure, and stopping prematurely aborting checking the results of mining from the proxy server except the timeout has elapsed.

Different notable fixes. As additionally talked about final week, we addressed the supply of 1 stall that occurred final month after DS node IP adjustments precipitated a number of view change failures. The repair concerned eradicating the IP deal with test round defective DS chief nodes and counting on the general public key as a substitute. One other notable repair is the addition of a lacking test for brand new contract account technology throughout contract creation. Previous to this repair, contract creation would proceed incorrectly despite the fact that the account storage was unsuccessfully up to date for the brand new account.

Scilla Updates

Work has begun on including customized inductive datatypes to Scilla. Scilla already permits the programmer to outline his personal algebraic datatypes, however since Scilla doesn’t permit basic recursion, inductive datatypes (datatypes that seek advice from themselves, e.g., bushes) have been disallowed since values of such a datatype can’t be traversed recursively anyway.

For inductive datatypes to be usable in follow, an inductive datatype must be geared up with a recursion precept. For the predefined inductive datatypes Record and Nat we use normal folds, which mix a strong computational mannequin with simple embedding into proof assistants corresponding to Coq.

For customized inductive datatypes we’re planning on offering a recursion precept just like fold. Nevertheless, we want the recursion precept to be extra basic, as a result of a standard fold requires a whole traversal of a data-structure. This requirement signifies that it’s, as an example, not possible to solely traverse one path by a tree from the basis to a leaf, which specifically prevents the implementation of environment friendly search bushes.

Scilla vs Transfer: The language crew at Zilliqa has additionally been busy learning Transfer — a sensible contract language being developed for the Libra blockchain by Fb. The crew will quickly share a weblog submit explaining the distinction between Scilla and Transfer. Here’s a sneak peek:

Scilla backend compiler: Now we have additionally been engaged on an environment friendly compiler backend for Scilla, and are writing an in depth article to clarify the design. This shall be launched within the coming weeks.

A abstract of different bug fixes and adjustments is given under:

  • Replace Scilla Travis model to Ubuntu 16.04
  • Up to date the one-msg warning evaluation to deal with procedures appropriately

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