MaxSkeletonSize

	Source (upstream pre-purge)	Current
File	eth/downloader/downloader.go	downloader_pow.go
Symbol	MaxBlockFetch	MaxSkeletonSize
Ref	45baf2111~1	etc/v1.17.3-full-node

Only MaxSkeletonSize retained from the original var block — rest live in upstream downloader.go. Used in fetchHeadersPoW to set the number of skeleton header fetches during initial sync.

3-way merge — purge → getc ← upstream

pre-purgecommon

var (

↗ MaxSkeletonSize = 128 // Number of header fetches needed for a skeleton assembly

)

core-geth validation — +1 -22

| | | |---|---| | File | [`downloader.go`](https://github.com/etclabscore/core-geth/blob/v1.12.20/eth/downloader/downloader.go) | | Symbol | `MaxBlockFetch` | | Ref | `v1.12.20` |

--- a/core-geth/eth/downloader/downloader.go
+++ b/etc/eth/downloader/downloader_pow.go
@@ -1,24 +1,3 @@
 var (
-   MaxBlockFetch   = 128 // Amount of blocks to be fetched per retrieval request
-   MaxHeaderFetch  = 192 // Amount of block headers to be fetched per retrieval request
-   MaxSkeletonSize = 128 // Number of header fetches to need for a skeleton assembly
-   MaxReceiptFetch = 256 // Amount of transaction receipts to allow fetching per request
-
-   maxQueuedHeaders            = 32 * 1024                       // [eth/62] Maximum number of headers to queue for import (DOS protection)
-   maxHeadersProcess           = 2048                            // Number of header download results to import at once into the chain
-   maxResultsProcess           = 2048                            // Number of content download results to import at once into the chain
-   fullMaxForkAncestry  uint64 = vars.FullImmutabilityThreshold  // Maximum chain reorganisation (locally redeclared so tests can reduce it)
-   lightMaxForkAncestry uint64 = vars.LightImmutabilityThreshold // Maximum chain reorganisation (locally redeclared so tests can reduce it)
-
-   reorgProtThreshold   = 48 // Threshold number of recent blocks to disable mini reorg protection
-   reorgProtHeaderDelay = 2  // Number of headers to delay delivering to cover mini reorgs
-
-   fsHeaderCheckFrequency = 100             // Verification frequency of the downloaded headers during snap sync
-   fsHeaderSafetyNet      = 2048            // Number of headers to discard in case a chain violation is detected
-   fsHeaderForceVerify    = 24              // Number of headers to verify before and after the pivot to accept it
-   fsHeaderContCheck      = 3 * time.Second // Time interval to check for header continuations during state download
-   fsMinFullBlocks        = 64              // Number of blocks to retrieve fully even in snap sync
-
-   maxTotalDifficultyDistance = 10               // Maximum amount of block difficulty units the master peer can lag behind w.r.t. other peers
-   totalDifficultyContCheck   = 13 * time.Second // Time interval to wait between total difficulty checks
+   MaxSkeletonSize = 128 // Number of header fetches needed for a skeleton assembly
 )

← Sync & Downloader