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immutable: when downloading an immutable file, use primary shares if they are available

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Primary shares require no erasure decoding so the more primary shares you have, the less CPU is used.
This commit is contained in:
Zooko O'Whielacronx 2008-12-20 07:14:56 -07:00
parent a71a68b31e
commit ec86563326
1 changed files with 7 additions and 2 deletions
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9
src/allmydata/immutable/download.py
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@ -875,8 +875,13 @@ class FileDownloader(log.PrefixingLogMixin):
potential_shnums = list(available_shnums - handled_shnums)
if not potential_shnums:
raise NotEnoughSharesError
# choose a random share
shnum = random.choice(potential_shnums)
# For the next share, choose a primary share if available, else a randomly chosen
# secondary share.
potential_shnums.sort()
if potential_shnums[0] < self._uri.needed_shares:
shnum = potential_shnums[0]
else:
shnum = random.choice(potential_shnums)
# and a random bucket that will provide it
validated_bucket = random.choice(list(self._share_vbuckets[shnum]))
self.active_buckets[shnum] = validated_bucket