Add release notes for the IBD memory spike issue.
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
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@ -4,3 +4,15 @@ release-notes at release time)
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Notable changes
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===============
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Fixed
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-----
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This is a hotfix release that fixes a regression in memory usage during
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Initial Block Download. The regression was indirectly caused by a change
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to prioritize downloading headers (PR #6231), introduced in release 5.3.1.
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It caused memory usage for new nodes to spike to roughly 11 GiB about an
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hour after starting Initial Block Download.
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The issue fixed by this release does not affect nodes that start from
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a fully synced chain, or that had sufficient memory available to get
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past the memory usage spike.
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