This time, track what location in the DiskQueue has been spilled in
persistent state, and then feed it back into the disk queue before
recovery.
This also introduces an ASSERT that recovery only reads exactly the
bytes that it needs to have in memory.
Popping the disk queue now requires potentially recovering the location
to which we can pop from the spilled data itself, and for each tag we
must maintain the first location with relevant data.
The previous queue we had to represent the ordering, queueOrder, was
used by spilling, and popped when a TLog had been spilled. This means
that as soon as a TLog has been fully spilled, we have no idea how it
relates in order to other fully spilled TLogs.
Instead, use queueOrder to keep track of all the TLog UIDs until they're
removed, and use spillOrder to keep track of the order only for
spilling.
Remove the use of relative paths. A header at foo/bar.h could be included by
files under foo/ with "bar.h", but would be included everywhere else as
"foo/bar.h". Adjust so that every include references such a header with the
latter form.
Signed-off-by: Robert Escriva <rescriva@dropbox.com>
mpilman