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Thanks Andy ... I know everything now :) Matevz On 10/24/12 7:10 AM, Andrew Hanushevsky wrote: > Ah, looking more closely at your request. You are wondering if the pre-read list > is seen by the proxy. Yes, but it does nothing as we had nothing to hook it to. > Implementations are welcome. Look at > > read(offset, length) > > which means I want this data here but I don't have anywhere to deliver it to yet. > > Andy > > On Tue, 23 Oct 2012, Matevz Tadel wrote: > >> Hi, >> >> Is there a way for a client to issue an advisory prefetch request to a server? >> The scenario I have in mind is: >> 1. The client knows it will need to access a specific part of the file but it >> will take it a while to plow through, with many small read requests. >> 2. It suspects (or knows) it is actually talking to a proxy server that needs >> to fetch data over WAN. >> 3. It knows it will NOT need any other part of the file. >> The request would be ignored by normal (non-proxy) servers. >> >> The use case is populating proxy-cache with known missing blocks from hadoop, >> 64 or 128MB in size ... but doing it on demand, when the "broken" file is >> actually accessed, and still trying to minimize latency in retrieval. >> >> Cheers, >> Matevz >> >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the XROOTD-DEV list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1 >> ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1