[Imports] Optimal ChangeSet size
niceman at att.net
Wed Jul 22 18:11:02 BST 2009
What is the optimal size of a changeset, and what are the tradeoffs in
changing the size? From what I understand, the API limit is 50000 , but it
would be good to keep below this so that later revisions to the changeset do
not push it over.
bulk_upload.php sets its limit at 1000 , which seems a bit small when
uploading lots of data - 50,000 nodes will create 50 changesets. Is
there any disadvantage to many changesets? Nodes are more likely to be in
different changesets than the ways.
Increasing the size might result in more lost upload time in case of a
network error - a larger changeset upload session will be lost. On the
other hand, if I increase the limit to 5000 or 10000 , does this slow down
future map edits by requiring fetching larger amounts of data from
changesets? (I'm not sure how that works).
More information about the Imports