blockchain: Optimize block locator generation. #1237
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This was referenced May 29, 2018
jrick
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This significantly optimizes and simplifies the generation of block locators by making use of the fact that all block nodes are now in memory and therefore it is no longer necessary to consult the database for the hashes or worry about issues related to dynamic loading of nodes. Also, it slightly modifies the algorithm so that the doubling doesn't start for one additional iteration in order to mirror the upstream code. Due to the way block locators are used, this does not change any semantics in terms of requesting and locating blocks. Finally, the semantics of BlockLocatorFromHash have been changed to return a locator for the current tip in the case the hash is unknown. This is preferable since only including the passed block hash, when it isn't known, could end up leading to causing a redownload of the entire chain under certain circumstances.
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This requires PRs #1229 and #1230.
This significantly optimizes and simplifies the generation of block locators by making use of the fact that all block nodes are now in memory and therefore it is no longer necessary to consult the database for the hashes or worry about issues related to dynamic loading of nodes.
Also, it slightly modifies the algorithm so that the doubling doesn't start for one additional iteration in order to mirror the upstream code. Due to the way block locators are used, this does not change any semantics in terms of requesting and locating blocks.
Finally, the semantics of
BlockLocatorFromHashhave been changed to return a locator for the current tip in the case the hash is unknown. This is preferable since only including the passed block hash, when it isn't known, could end up leading to causing a redownload of the entire chain under certain circumstances.This is work towards #1145.