go/worker/common: Refresh node descriptors mid-epoch #2584
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@@ Coverage Diff @@
## master #2584 +/- ##
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- Coverage 63.47% 63.38% -0.1%
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Files 357 359 +2
Lines 33682 33841 +159
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+ Hits 21381 21449 +68
- Misses 9693 9764 +71
- Partials 2608 2628 +20
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Previously node descriptors were only refreshed on an epoch transition which meant that any later updates were ignored. This caused stale RAKs to stay in effect when runtime restarts happened. Enabling mid-epoch refresh also makes having more ephemeral keys easier.
Commit 2fdfd28 introduced a possibility of the storage round syncing process to deadlock when an unfortunate series of events occur in specific order. Assume the following happens, in order: 1. Round X has just completed syncing and has been applied, so lastFullyAppliedRound has been updated to X and all metadata about round X has been removed from syncingRounds and hashCache. Since the round has not yet been finalized, cachedLastRound still points to X-1. 2. A new incoming block for round X+1 appears. 3. The code checks what needs to be synced and starts with cachedLastRound which still points to round X-1 (because round X has not yet been applied). Because sync metadata of round X have been removed, it assumes that round X is not yet synced so it starts syncing it by queuing sync requests and adding new metadata to the top of the syncingRounds heap. 4. Round X is finalized, so cachedLastRound is updated to X. Since the top of the sync management loop checks if lastFullyAppliedRound + 1 is at the top of the heap this leads to a deadlock. The top item contains metadata for round X while the management loop is waiting for X+1. This commit fixes the issue by using lastFullyAppliedRound in the incoming block handler instead of cachedLastRound.
Also use new generalized interfaces for managing gRPC connections to committee members (with support for mid-epoch refresh).
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Fixes #1794.
Fixes #2193
Previously node descriptors were only refreshed on an epoch transition which
meant that any later updates were ignored. This caused stale RAKs to stay in
effect when runtime restarts happened.
Enabling mid-epoch refresh also makes having more ephemeral keys easier.
TODO
NodeInfofrom commitment pool.