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This change restructures the source code directories, separates shared
form non-shared application code and adds CMake dependencies. These
dependencies allow the tracking of changes and trigger a rebuild of
those build targets where changed files are involved.
WARNING: Note that the support of the DNBD3_SERVER_AFL build option is
not supported yet. Thus, the option should be never turned on.
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- Now uses linked lists instead of huge array
- Does prefetch data on client requests
- Can have multiple replication requests in-flight
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Cache maps will now be saved periodically, but only if either they have
a "dirty" bit set, which happens if any bits in the map get cleared
again (due to corruption), or if new data has been replicated from an
uplink server. This either means at least one byte received and 5
minutes have passed, or at least 500MB have been downloaded. The timer
currently runs every 20 seconds.
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Alt-Server checks are now run using the threadpool, so we don't need a
queue and dedicated thread anymore. The rtt history is now kept per
uplink, so many uplinks won't overwhelm the history, making its time
window very short.
Also the fail counter is now split up; a global one for when the server
actually isn't reachable, a local (per-uplink) one for when the server
is reachable but doesn't serve the requested image.
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In case we don't use background replication a connection to an uplink
server can potentially stay around forever. This in turn would prevent
the uplink server from freeing the image as it appears to be in use.
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maxClients, maxImages, maxPayload, maxReplicationSize
Refs #3231
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This will close the readFd of images that have no active clients
after some idle period (1 hour currently).
Prevents deleted images from taking up space until the server
is shut down.
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