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(ITS#5718) [documentation] Mention dontusecopy control in conjunctionwith slapo-chain(5)

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Gavin Henry 2008-09-30 11:51:35 +00:00
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doc/guide/admin/overlays.sdf
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@ -322,6 +322,20 @@ side, the actual error is returned to the client.
> chain-return-error TRUE
H3: Read-Back of Chained Modifications
Occasionally, applications want to read back the data that they just wrote.
If a modification requested to a shadow server was silently chained to its
producer, an immediate read could result in receiving data not yet sync'ed.
In those cases, clients should use the {{B:dontusecopy}} control to ensure
they are directed to the authoritative source for that piece of data.
This control usually causes a referral to the actual source of the data
to be returned. However, when the {{slapo-chain(5)}} overlay is used,
it intercepts the referral being returned in response to the
{{B:dontusecopy}} control, and tries to fetch the requested data.
H3: Further Information
{{:slapo-chain(5)}}