* Simplify accounts healing threshold management
why:
Was over-engineered.
details:
Previously, healing was based on recursive hexary trie perusal.
Due to "cheap" envelope decomposition of a range complement for the
hexary trie, the cost of running extra laps have become time-affordable
again and a simple trigger mechanism for healing will do.
* Control number of dangling result nodes in `hexaryInspectTrie()`
also:
+ Returns number of visited nodes available for logging so the maximum
number of nodes can be tuned accordingly.
+ Some code and docu update
* Update names of constants
why:
Declutter, more systematic naming
* Re-implemented `worker_desc.merge()` for storage slots
why:
Provided as proper queue management in `storage_queue_helper`.
details:
+ Several append modes (replaces `merge()`)
+ Added third queue to record entries currently fetched by a worker. So
another parallel running worker can safe the complete set of storage
slots in as checkpoint. This was previously lost.
* Refactor healing
why:
Simplify and remove deep hexary trie perusal for finding completeness.
Due to "cheap" envelope decomposition of a range complement for the
hexary trie, the cost of running extra laps have become time-affordable
again and a simple trigger mechanism for healing will do.
* Docu update
* Run a storage job only once in download loop
why:
Download failure or rejection (i.e. missing data) lead to repeated
fetch requests until peer disconnects, otherwise.
* Relocated mothballing (i.e. swap-in preparation) logic
details:
Mothballing was previously tested & started after downloading
account ranges in `range_fetch_accounts`.
Whenever current download or healing stops because of a pivot change,
swap-in preparation is needed (otherwise some storage slots may get
lost when swap-in takes place.)
Also, `execSnapSyncAction()` has been moved back to `pivot_helper`.
* Reorganised source file directories
details:
Grouped pivot focused modules into `pivot` directory
* Renamed `checkNodes`, `sickSubTries` as `nodes.check`, `nodes.missing`
why:
Both lists are typically used together as pair. Renaming `sickSubTries`
reflects moving away from a healing centric view towards a swap-in
attitude.
* Multi times coverage recording
details:
Per pivot account ranges are accumulated into coverage range set. This
set fill eventually contain a singe range of account hashes [0..2^256]
which amounts to 100% capacity.
A counter has been added that is incremented whenever max capacity is
reached. The accumulated range is then reset to empty.
The effect of this setting is that the coverage can be evenly duplicated.
So 200% would not accumulate on a particular region.
* Update range length comparisons (mod 2^256)
why:
A range interval can have sizes 1..2^256 as it cannot be empty by
definition. The number of points in a range intervals set can have
0..2^256 points. As the scalar range is a residue class modulo 2^256,
the residue class 0 means length 2^256 for a range interval, but can
be 0 or 2^256 for the number of points in a range intervals set.
* Generalised `hexaryEnvelopeDecompose()`
details:
Compile the complement of the union of some (processed) intervals and
express this complement as a list of envelopes of sub-tries.
This facility is directly applicable to swap-in book-keeping.
* Re-factor `swapIn()`
why:
Good idea but baloney implementation. The main algorithm is based on
the generalised version of `hexaryEnvelopeDecompose()` which has been
derived from this implementation.
* Refactor `healAccounts()` using `hexaryEnvelopeDecompose()` as main driver
why:
Previously, the hexary trie was searched recursively for dangling nodes
which has a poor worst case performance already when the trie is
reasonably populated.
The function `hexaryEnvelopeDecompose()` is a magnitude faster because
it does not peruse existing sub-tries in order to find missing nodes
although result is not fully compatible with the previous function.
So recursive search is used in a limited mode only when the decomposer
will not deliver a useful result.
* Logging & maintenance fixes
details:
Preparation for abandoning buddy-global healing variables `node`,
`resumeCtx`, and `lockTriePerusal`. These variable are trie-perusal
centric which will be run on the back burner in favour of
`hexaryEnvelopeDecompose()` which is used for accounts healing already.
* Additional logging for scheduler
* Fix duplicate occurrence of `bestNumber`
why:
Happened when the `block_queue` module was separated out of
the `worker` module. Somehow testing was insufficient or skipped,
at all.
* Update `runPool()` mixin for scheduler
details:
Could be simplified
* Dynamically adapt pivot header negotiation mode
details:
After accepting one peer and some timeout, do not search for more
peers for start syncing but rather continue in relaxed mode with a
single peer.
The `BlockHeader` structure in `nim-eth` was updated with support for
EIP-4844 (danksharding). To enable the `nim-eth` bump, the ingress of
`BlockHeader` structures has been hardened to reject headers that have
the new `excessDataGas` field until proper EIP4844 support exists.
https://github.com/status-im/nim-eth/pull/570
* Provide index to reconstruct missing storage slots
why;
Pivots will be changed anymore once they are officially archived. The
account of the archived pivots are ready to be swapped into the active
pivot. This leaves open how to treat storage slots not fetched yet.
Solution: when mothballing, an `account->storage-root` index is
compiled that can be used when swapping in accounts.
* Implement swap-in from earlier pivots
details;
When most accounts are covered by the current and previous pivot
sessions, swapping inthe accounts and storage slots (i.e. registering
account ranges done) from earlier pivots takes place if there is a
common sub-trie.
* Throttle pivot change when healing state has bean reached
why:
There is a hope to complete the current pivot, so pivot update can be
throttled. This is achieved by setting another minimum block number
distance for the pivot headers. This feature is still experimental
* Miscellaneous tweaks & fixes
details:
+ Catch `TransportError` exception in `legacy.nim` module
+ Fix self-calling wrapper `hexaryEnvelopeTouchedBy()`
* Update documentation, logging etc.
* Changed `checkNode` batch list `seq[Blob]` => `seq[NodeSpecs]`
why:
The `NodeSpecs` type as used here is a tuple `(partial-path,node-key)`.
When `checkNode` partial paths are collected, also the node key is
available so it should be registered and not repeatedly recovered from
the database.
* Add optional begin/end trace statement in snap scheduler
why:
Allows to trace invoked entity and scheduler state variables
* Rename and update dismantle => hexaryEnvelopeDecompose()
why:
+ As for naming, a positive connotation is prefered
+ The unit tests were really insufficient
+ The function result was wrong on a few boundry conditions
detail:
+ Extracted the function from `hexary_paths.nim` and re-implemented
it together with other envelope functions => `hexary_envelope.nim`
+ Re-wrote docu for `hexaryEnvelopeDecompose()`
* Relaxed right condition for `hexaryEnvelopeDecompose()` range argument
why;
Previously, the right point of the argument interval had to be a path
to an allocated leaf node. While this is typically a given for accounts,
it is easier to require an arbitrary range of paths (or keys) with
the requirement of a `boundary proof` for left and right (i.e. enough
nodes in the database to find the end points.)
also:
Bug fixes for related functions (typos, missing conditions etc.)
* Add missing unit tests include file
* Add quick hexary trie inspector, called `dismantle()`
why:
+ Full hexary trie perusal is slow if running down leaf nodes
+ For known range of leaf nodes, work out the UInt126-complement of
partial sub-trie paths (for existing nodes). The result should cover
no (or only a few) sub-tries with leaf nodes.
* Extract common healing methods => `sub_tries_helper.nim`
details:
Also apply quick hexary trie inspection tool `dismantle()`
Replace `inspectAccountsTrie()` wrapper by `hexaryInspectTrie()`
* Re-arrange task dispatching in main peer worker
* Refactor accounts and storage slots downloaders
* Rename `HexaryDbError` => `HexaryError`
The `BlockHeader` structure in `nim-eth` was updated with support for
EIP-4895 (withdrawals). To enable the `nim-eth` bump, the ingress of
`BlockHeader` structures has been hardened to reject headers that have
the new `withdrawalsRoot` field until proper withdrawals support exists.
https://github.com/status-im/nim-eth/pull/562
* Stop negotiating pivot if peer repeatedly replies w/usesless answers
why:
There is some fringe condition where a peer replies with legit but
useless empty headers repetely. This goes on until somebody stops.
We stop now.
* Rename `missingNodes` => `sickSubTries`
why:
These (probably missing) nodes represent in reality fully or partially
missing sub-tries. The top nodes may even exist, e.g. as a shallow
sub-trie.
also:
Keep track of account healing on/of by bool variable `accountsHealing`
controlled in `pivot_helper.execSnapSyncAction()`
* Add `nimbus` option argument `snapCtx` for starting snap recovery (if any)
also:
+ Trigger the recovery (or similar) process from inside the global peer
worker initialisation `worker.setup()` and not by the `snap.start()`
function.
+ Have `runPool()` returned a `bool` code to indicate early stop to
scheduler.
* Can import partial snap sync checkpoint at start
details:
+ Modified what is stored with the checkpoint in `snapdb_pivot.nim`
+ Will be loaded within `runDaemon()` if activated
* Forgot to import total coverage range
why:
Only the top (or latest) pivot needs coverage but the total coverage
is the list of all ranges for all pivots -- simply forgotten.
* Piecemeal trie inspection
details:
Trie inspection will stop after maximum number of nodes visited.
The inspection can be resumed using the returned state from the
last session.
why:
This feature allows for task switch between `piecemeal` sessions.
* Extract pivot helper code from `worker.nim` => `pivot_helper.nim`
* Accounts import will now return dangling paths from `proof` nodes
why:
With proper bookkeeping, this can be used to start healing without
analysing the the probably full trie.
* Update `unprocessed` account range handling
why:
More generally, the API of a pairs of unprocessed intervals favours
the first set and not before that is exhausted the second set comes
into play.
This was unfortunately implemented which caused the ranges to be
unnecessarily fractioned. Now the number of range interval typically
remains in the lower single digit numbers.
* Save sync state after end of downloading some accounts
details:
restore/resume to be implemented later
* Add `stop()` methods to shutdown to shutdown procedure
why:
Nasty behaviour when hitting Ctrl-C, otherwise
* Add background service to sync scheduler
why:
The background service will be used for sync data import and recovery
after restart.
It is controlled by the sync scheduler for an easy turn/on off API.
also:
Simplified snap ticker time calc.
* Fix typo
why:
Single mode here means there is only such (single mode) instance
activated but multi mode instances for other peers are allowed.
Erroneously, multi mode instances were held back waiting while some
single mode instance was running which reduced the number of parallel
download peers.
* Update log ticker, using time interval rather than ticker count
why:
Counting and logging ticker occurrences is inherently imprecise. So
time intervals are used.
* Use separate storage tables for snap sync data
* Left boundary proof update
why:
Was not properly implemented, yet.
* Capture pivot in peer worker (aka buddy) tasks
why:
The pivot environment is linked to the `buddy` descriptor. While
there is a task switch, the pivot may change. So it is passed on as
function argument `env` rather than retrieved from the buddy at
the start of a sub-function.
* Split queues `fetchStorage` into `fetchStorageFull` and `fetchStoragePart`
* Remove obsolete account range returned from `GetAccountRange` message
why:
Handler returned the wrong right value of the range. This range was
for convenience, only.
* Prioritise storage slots if the queue becomes large
why:
Currently, accounts processing is prioritised up until all accounts
are downloaded. The new prioritisation has two thresholds for
+ start processing storage slots with a new worker
+ stop account processing and switch to storage processing
also:
Provide api for `SnapTodoRanges` pair of range sets in `worker_desc.nim`
* Generalise left boundary proof for accounts or storage slots.
why:
Detailed explanation how this works is documented with
`snapdb_accounts.importAccounts()`.
Instead of enforcing a left boundary proof (which is still the default),
the importer functions return a list of `holes` (aka node paths) found in
the argument ranges of leaf nodes. This in turn is used by the book
keeping software for data download.
* Forgot to pass on variable in function wrapper
also:
+ Start healing not before 99% accounts covered (previously 95%)
+ Logging updated/prettified
* Update docu and logging
* Extracted and updated constants from `worker_desc` into separate file
* Update and re-calibrate communication error handling
* Allow simplified pivot negotiation
why:
This feature allows to turn off pivot negotiation so that peers agree
on a a pivot header.
For snap sync with fast changing pivots this only throttles the sync
process. The finally downloaded DB snapshot is typically a merged
version of different pivot states augmented by a healing process.
* Re-model worker queues for accounts download & healing
why:
Currently there is only one data fetch per download or healing task.
This task is then repeated by the scheduler after a short time. In
many cases, this short time seems enough for some peers to decide to
terminate connection.
* Update main task batch `runMulti()`
details:
The function `runMulti()` is activated in quasi-parallel mode by the
scheduler. This function calls the download, healing and fast-sync
functions.
While in debug mode, after each set of jobs run by this function the
database is analysed (by the `snapdb_check` module) and the result
printed.
* Update logging
* Fix node hash associated with partial path for missing nodes
why:
Healing uses the partial paths for fetching nodes from the network. The
node hash (or key) is used to verify the node data retrieved.
The trie inspector function returned the parent hash instead of the node hash
with the partial path when a missing node was detected. So all nodes
for healing were rejected.
* Must not modify sequence while looping over it
* Re-arrange fetching storage slots in batch module
why;
Previously, fetching partial slot ranges first has a chance of
terminating the worker peer 9due to network error) while there were
many inheritable storage slots on the queue.
Now, inheritance is checked first, then full slot ranges and finally
partial ranges.
* Update logging
* Bundled node information for healing into single object `NodeSpecs`
why:
Previously, partial paths and node keys were kept in separate variables.
This approach was error prone due to copying/reassembling function
argument objects.
As all partial paths, keys, and node data types are more or less handled
as `Blob`s over the network (using Eth/6x, or Snap/1) it makes sense to
hold these `Blob`s as named field in a single object (even if not all
fields are active for the current purpose.)
* For good housekeeping, using `NodeKey` type only for account keys
why:
previously, a mixture of `NodeKey` and `Hash256` was used. Now, only
state or storage root keys use the `Hash256` type.
* Always accept latest pivot (and not a slightly older one)
why;
For testing it was tried to use a slightly older pivot state root than
available. Some anecdotal tests seemed to suggest an advantage so that
more peers are willing to serve on that older pivot. But this could not
be confirmed in subsequent tests (still anecdotal, though.)
As a side note, the distance of the latest pivot to its predecessor is
at least 128 (or whatever the constant `minPivotBlockDistance` is
assigned to.)
* Reshuffle name components for some file and function names
why:
Clarifies purpose:
"storages" becomes: "storage slots"
"store" becomes: "range fetch"
* Stash away currently unused modules in sub-folder named "notused"
* Multiple storage batches at a time
why:
Previously only some small portion was processed at a time so the peer
might have gone when the process was resumed at a later time
* Renamed some field of snap/1 protocol response object
why:
Documented as `slots` is in reality a per-account list of slot lists. So
the new name `slotLists` better reflects the nature of the beast.
* Some minor healing re-arrangements for storage slot tries
why;
Resolving all complete inherited slots tries first in sync mode keeps
the worker queues smaller which improves logging.
* Prettify logging, comments update etc.
* Re-model persistent database access
why:
Storage slots healing just run on the wrong sub-trie (i.e. the wrong
key mapping). So get/put and bulk functions now use the definitions
in `snapdb_desc` (earlier there were some shortcuts for `get()`.)
* Fixes: missing return code, typo, redundant imports etc.
* Remove obsolete debugging directives from `worker_desc` module
* Correct failing unit tests for storage slots trie inspection
why:
Some pathological cases for the extended tests do not produce any
hexary trie data. This is rightly detected by the trie inspection
and the result checks needed to adjusted.
* For snap sync, publish `EthWireRef` in sync descriptor
why:
currently used for noise control
* Detect and reuse existing storage slots
* Provide healing module for storage slots
* Update statistic ticker (adding range factor for unprocessed storage)
* Complete mere function for work item ranges
why:
Merging interval into existing partial item was missing
* Show av storage queue lengths in ticker
detail;
Previous attempt shows average completeness which did not tell much
* Correct the meaning of the storage counter (per pivot)
detail:
Is the # accounts that have a storage saved
* Rename `LeafRange` => `NodeTagRange`
* Replacing storage slot partition point by interval
why:
The partition point only allows to describe slots `[point,high(Uint256)]`
for fetching interval slot ranges. This has been generalised for any
interval.
* Replacing `SnapAccountRanges` by `SnapTrieRangeBatch`
why:
Generalised healing status for accounts, and later for storage slots.
* Improve accounts healing loop
* Split `snap_db` into accounts and storage modules
why:
It is cleaner to have separate session descriptors for accounts and
storage slots (based on a common base descriptor.)
Also, persistent storage handling might be changed in future which
requires the storage slot implementation disentangled from the accounts
handling.
* Re-model worker queues for storage slots
why:
There is a dynamic list of storage sub-tries, each one has to be
treated similar to the accounts database. This applied to slot
interval downloads as well as to healing
* Compress some return value report lists for snapdb methods
why:
No need to report all handling details for work items that are filteres
out and discarded, anyway.
* Remove inner loop frame from healing function
why:
The healing function runs as a loop body already.
* Split fetch accounts into sub-modules
details:
There will be separated modules for accounts snapshot, storage snapshot,
and healing for either.
* Allow to rebase pivot before negotiated header
why:
Peers seem to have not too many snapshots available. By setting back the
pivot block header slightly, the chances might be higher to find more
peers to serve this pivot. Experiment on mainnet showed that setting back
too much (tested with 1024), the chances to find matching snapshot peers
seem to decrease.
* Add accounts healing
* Update variable/field naming in `worker_desc` for readability
* Handle leaf nodes in accounts healing
why:
There is no need to fetch accounts when they had been added by the
healing process. On the flip side, these accounts must be checked for
storage data and the batch queue updated, accordingly.
* Reorganising accounts hash ranges batch queue
why:
The aim is to formally cover as many accounts as possible for different
pivot state root environments. Formerly, this was tried by starting the
accounts batch queue at a random value for each pivot (and wrapping
around.)
Now, each pivot environment starts with an interval set mutually
disjunct from any interval set retrieved with other pivot state roots.
also:
Stop fishing for more pivots in `worker` if 100% download is reached
* Reorganise/update accounts healing
why:
Error handling was wrong and the (math. complexity of) whole process
could be better managed.
details:
Much of the algorithm is now documented at the top of the file
`heal_accounts.nim`
* Miscellaneous updates TBC
* Disentangled pivot2 module from snap
why:
Wrote as template on top of sync so it can be shared by fast and snap
sync.
* Renamed and relocated pivot sources
* Integrated `best_pivot` module into full and snap sync
why:
Full sync used an older version of `best_pivot`
* isolating download module from full sync
why;
might be shared with snap sync at a later stage
* Added inspect module
why:
Find dangling references for trie healing support.
details:
+ This patch set provides only the inspect module and some unit tests.
+ There are also extensive unit tests which need bulk data from the
`nimbus-eth1-blob` module.
* Alternative pivot finder
why:
Attempt to be faster on start up. Also tying to decouple pivot finder
somehow by providing different mechanisms (this one runs in `single`
mode.)
* Use inspect module for healing
details:
+ After some progress with account and storage data, the inspect facility
is used to find dangling links in the database to be filled nose-wise.
+ This is a crude attempt to cobble together functional elements. The
set up needs to be honed.
* fix scheduler to avoid starting dead peers
why:
Some peers drop out while in `sleepAsync()`. So extra `if` clauses
make sure that this event is detected early.
* Bug fixes causing crashes
details:
+ prettify.toPC():
int/intToStr() numeric range over/underflow
+ hexary_inspect.hexaryInspectPath():
take care of half initialised step with branch but missing index into
branch array
* improve handling of dropped peers in alternaive pivot finder
why:
Strange things may happen while querying data from the network.
Additional checks make sure that the state of other peers is updated
immediately.
* Update trace messages
* reorganise snap fetch & store schedule
* Re-implemented `hexaryFollow()` in a more general fashion
details:
+ New name for re-implemented `hexaryFollow()` is `hexaryPath()`
+ Renamed `rTreeFollow()` as `hexaryPath()`
why:
Returning similarly organised structures, the results of the
`hexaryPath()` functions become comparable when running over
the persistent and the in-memory databases.
* Added traversal functionality for persistent ChainDB
* Using `Account` values as re-packed Blob
* Repack samples as compressed data files
* Produce test data
details:
+ Can force pivot state root switch after minimal coverage.
+ For emulating certain network behaviour, downloading accounts stops for
a particular pivot state root if 30% (some static number) coverage is
reached. Following accounts are downloaded for a later pivot state root.
* Bump nim-stew
why:
Need fixed interval set
* Keep track of accumulated account ranges over all state roots
* Added comments and explanations to unit tests
* typo
* Extracted functionality into sub-modules for maintainability
* Setting SST bulk load as default in `accounts_db`
details:
+ currently, the same data are stored via rocksdb if available, and
the same via embedded `storage_type` with (non-standard) prefix 200
for time comparisons
+ fallback to normal `put()` unless rocksdb is accessible
* Provided common scheduler API, applied to `full` sync
* Use hexary trie as storage for proofs_db records
also:
+ Store metadata with account for keeping track of account state
+ add iterator over accounts
* Common scheduler API applied to `snap` sync
* Prepare for accounts bulk import
details:
+ Added some ad-hoc checks for proving accounts data received from the
snap/1 (will be replaced by proper database version when ready)
+ Added code that dumps some of the received snap/1 data into a file
(turned of by default, see `worker_desc.nim`)
jangko
Jordan Hrycaj
Etan Kissling
Jacek Sieka