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thundering herd

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Joey Hess 2015-03-03 22:01:08 -04:00
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doc/design/iabackup.mdwn
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@ -221,3 +221,12 @@ A client could add other files to its local repo, and git-annex branch
pushes would include junk data about those files. It should probably be
filtered out by the git update hook (rejecting the whole push because of
this seems excessive).
There may be a thundering herd problem, where many clients end up
downloading the same Item at the same time, and more copies than neecessary
result. The next `git annex sync --content` in some of the
redundant clients will notice this and drop that item, and presumably
download some other item. However, it might be good to rate limit the
number of concurrent downloads of a given item, to prevent this and perhaps
other issues. This could be done by a wrapper around git-annex shell or
perhaps a git-annex modification.