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<title>Remote file access</title>
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<body bgcolor=ffffff>
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<h2>Remote file access</h2>
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<p>
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Output files can be designated as sticky but not upload-when-present.
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Sometimes this is done because the file will be
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used as an input for a later workunit; it may also be done to spread
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large output data across participant disks, in cases where the data may
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be too large to store on the project back-end.
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<p>
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To access such a file, the back end inserts a <b>file access
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request</b> in the database.
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This specifies a file and a data-server URL.
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When a host storing the file contacts the scheduling server (which
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may not happen for a while) the scheduling server forwards the file
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access request.
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The host confirms the file transfer when it is
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completed; the back-end must poll for this event.
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